Sulphur Bank Mine
Encyclopedia
The Sulphur Bank Mine is located near Clearlake Oaks
and Clear Lake in Lake County
, California
. The 150 acre (0.607029 km²) mine became one of the most noted mercury
producers in the world.
During the 150 years since the Sulphur Bank was discovered, the area has drawn geologists, inspired unique scientific theories, established constitutional case law and now attracts environmental scientists who study the impact of mercury contamination within the Cache Creek watershed of northern California and the Sacramento River-Delta Region
and San Francisco Bay
.
. Mining for sulfur
began in 1865, and produced 2,000,000 pounds (909,090 kg) in four years. Mercury
ore was mined intermittently by underground and open-pit methods from 1873 to 1957. Sulphur Bank Mine was credited with total output of 92,400 flasks (7.02 million pounds) by 1918. The mine was an important producer during both world wars.
The mine closed in 1957 and is a California Historical Landmark
(#428). Sulphur Bank Mine became an Environmental Protection Agency (EPA) superfund site in 1990.
The officers of the California Borax Company included physicians Veatch, William Ayers and Robert Oxland; and lawyers Henry Halleck, Archibald Peachy, William Billings
and Solomon Heydenfeldt
. The fascination with borax resulted from the fact that boric acid
was critical as a flux
in metal working. All borax at that time was imported, mostly from the Tuscan Lakes
area of Italy
. The California Borax Company did engage in sulfur mining at Sulphur Bank (extracting 2 million pounds in 4 years)
.
But the rush did result in the discovery of cinnabar in 1860. Montgomery, who became a stockholder in the X.L.C.R. mine, is the only known source of the often-repeated tale of Seth Dunham and L.D. Jones discovering cinnabar in a road cut of the Barryessa-Lower Lake Road (now Morgan Valley Road) in what became known as the Knoxville mining district, about a dozen miles south east of the Sulphur Bank in present-day Napa County. The X.L.C.R. became known as the Redington mine a decade later and was second only to the New Almaden mine in production.
Another account of the discovery of cinnabar in the same region is contained in the December 1861 edition of Scientific American
magazine. “There has been recently opened an extensive cinnabar vein, in Napa County, which promises to be rich. This was discovered by John Newman, of Pope’s Valley. The cinnabar was discovered by means of the fires which are made to burn off the chaparral,” the magazine reported.
Newman became a stockholder of the Phoenix mine in that location. These early discoveries of mercury-bearing ores did not become viable mercury producers until 1872, when the price of mercury and improved smelting methods resulted in the establishment of many mines in Lake and Napa counties.
, for the purpose of quicksilver mining at Sulphur Bank. Until 1875, when the mine shipped 5,218 flasks of mercury, it operated under the name of the borax company but then changed the name to the Sulphur Bank Quicksilver Mining Company.
Tiburcio Parrott was controlling partner of the new company, and it was he who was later jailed when the company refused to abide by a state law excluding Chinese from employment.
Tiburcio’s father, John Parrott, was a wealthy banker. Parrot and Company, of San Francisco was a major landholder and banking firm. John Parrot’s weekend retreat consisted of 17000 acres (68.8 km²) in San Mateo County, California. John Parrot also owned 8% of the giant New Almaden
quicksilver mine in Santa Clara County.
Babcock was an officer of Parrott and Company and was a partner with Tiburcio Parrott in an import-export company. Mills was also asset rich, founding the Bank of California, but who had stepped down as bank president by the time of the Sulphur Bank mercury mining era. It was Mills who later saved Bank of California
with his personal assets when it failed under William Chapman Ralston
.
The period of 1875 to 1883 was the heyday of the mining activity. The Sulphur Bank Quicksilver Mine often had the highest output after the New Almaden, the New Idria
(San Benito County) and the Redington. However, profits were tempered by the temperature of the underground workings. The Chinese miners, who did most of the underground work, had to endure temperatures of 176 °F (80 °C) because the ore body followed the path of at least three hot springs at the site.
The mercury was shipped in iron flasks weighing about 90 pounds each and containing 76.5 pounds of mercury. The closest rail service was 45 miles (72.4 km) away in Calistoga. The wagon trip over the crest of Mt Saint Helena
via the Lawley Toll Road to the rail head could take a week or more.
Just how much mercury was shipped from Sulphur Bank is a matter of some estimation. The History of Lake County 1881 puts production at 12,341 flasks in the two-years 1874-1876. Walter W. Bradley, state mineralogist, estimated total output to 1918 at 92,400 flasks. The mine was only sporadically worked after 1883, so the majority of the output can be attributed to the Parrott era.
was established next to the mine. The mining superintendent, Ferdinand Fiedler listed his address at Eastlake as did assistant superintendent, J.E. Tucker. The German-born Fiedler was the furnace operator and postmaster at the New Almaden mine before taking the post of superintendent at Sulphur Bank. The mine’s owner-investors all lived in San Francisco. Eastlake was directly adjacent to the mining property. After the mine closed, Eastlake was abandoned.
Those who worked at the mine in 1880 constituted an ethnic soup of foreign-born workers. The 1880 federal census, dated June 22, 1880, listed 218 Chinese-born men and 40 Occidentals associated with the mine. Only a few of the white miners were born in the United States. Immigrants from Sweden and Norway constituted the bulk of the European miners. A few of the miners were Irish born as were two Mexicans. Most of the miners had no families present but some of the managers had families and children living at Eastlake. None of the Chinese miners had families present.
"At Sulphur Bank tunnels were used in developing and mining the ore just under and in the basalt capping. In depth, development and mining proceeded through shallow shafts. Operations from any one shaft were carried on until the hot water and gas made conditions intolerable, when the shaft was abandoned and a new one was sunk a short distance away." Curt Schuette, the author of the US Bureau of Mines bulletin #335 observed.
The cinnabar ore, known also as mercury sulfide
(84 parts mercury to 16 parts sulfur), was treated in furnaces and retorts near the mine. The essential refining method was to turn the mercury into gas and recondense it to quicksilver. The sulfur would burn and convert to carbon; the waste rock associated with the ore is known as calcine, or burnt rock, would be dumped near the lake shore, out of the way of the mining works. All of the furnaces at all of the mines in the vicinity were wood fired.
The township of Eastlake, which included a dry goods store, post office and a hotel-restaurant was abandoned after the mine’s closure.
The mine was apparently inactive through the remainder of the 1880s. Geologist George F. Becker visited the mine several times between 1883 and 1888. Becker’s survey of quicksilver mining in the western United States usually includes the names of watchmen or mine personnel at the sites he studied, but no names are mentioned during his visits to Sulphur Bank. The Fiedler shaft was flooded and overflowing into Clear Lake in 1887. The mine was operated sporadically in the 1890s, evidenced by the presence of mine superintendent Richard White.
John Parrott died in 1884, and his widow, Abigail inherited control of Parrott and Company. Abigail was not the mother of Tiburcio Parrott. He was born 1842, the bastard child of John Parrott and Deloris Ochoa. John Parrott was the American Consul to Mexico at Mazatlan. The War with Mexico in 1845-1846 put a temporary end to the diplomacy business. John Parrott then set up his banking and real estate business in San Francisco in 1848 or 1850.
Tiburcio Parrott was educated in the United States and Europe. After the failure of the mercury mine, he spent the last decade of his life founding and operating a wine estate, near the township of St. Helena, California. There he became closely associated with the German-born Beringer Brothers: Frederick and Jacob. Tiburcio Parrott died in 1894.
In 1901, the Sulphur Bank mine was sold to a group of New York bankers.
that it offers no opportunity’ to study the formations through which it has passed,” wrote William Forstner, of California State Mining Bureau. He also observed that Sulphur Bank had the appearance of an abandoned hydraulic mine
.
The summary appears reasonably accurate based on New York Times reports: “A big deal in California quicksilver mines was made today when New York capitalists bought for $1,000,000 the Sulphur Bank and Abbot mines in Lake County and Empire and Central, in Colusa County, which are among the largest producers in the world. From the first two mines $2,000,000 in quicksilver has been taken but the Colusa mines are only partly developed,” the paper reported on October 11, 1901. The article lists the buyers as bankers William Dowe, William Kimball, William Scherer, and iron monger Henry Adams as director.
There is no evidence how Plumer’s claim was resolved, but the millions of dollars allegedly on or under the table boiled down to $750 in cash by 1903. “United State Marshal Henkel sold by auction yesterday 379,985 shares of the stock of the Empire Consolidated Quicksilver Mining Company, which was bid in for $750 by William Hughes of 100 Nassau Street. The stock was seized ... to satisfy a judgement ... against Riley A. Boggess. The stock had been pledged with the North American Trust Company to secure loans. ... ” The Times reported April 21, 1903.
and amateur botanist, who lived in Alameda in 1910 and San Francisco by 1920. How he came into possession of the property and surrounding acreage is unclear. Walter W. Bradley’s report on quicksilver mining in California lists Ruddock as the owner of Sulphur Bank by 1918 and that Ruddock had the mine under lease to an H.W. Gould.
State mineralogist W.W. Bradley indicated Sulphur Bank had not been worked or de-watered since 1906. The old Empire Consolidated Quicksilver Mining Company was now headed by Riley Boggess’ wife, Emma, which still held possession of the Abbott and other mines near Sulphur Creek in Colusa and Lake counties. Neither the Abbott nor Sulphur Bank were being actively worked.
“For the present at least, no underground work is planned, there being several hundred thousand tons at the surface, estimated as material available for treatment ... Practically all of the dumps in sight and some over the hill on the north side, have concentratable values in cinnabar. The material can be cheaply excavated with a steam shovel and transported to the mill by motor trucks, as it will have to be moved distances up to mile and raised to the top of the mill bin,” Bradley reported.
Whether the plan for mining exclusively by open-pit methods proceeded is uncertain but that method was employed a decade later when the Bradley Mining Company acquired the Sulphur Bank mercury mine.
There is no known connection between Bradley Mining Company and Walter Wadsworth Bradley, who would become the California State Mineralogist.
Frederick's father, Henry Sewall Bradley came to California to work the gold fields, became a land surveyor instead, and died in 1881 when Frederick Bradley was mid-way through his education at the University of California.
Frederick Bradley dropped out of school, borrowed $5,000 and took over ownership/management of the existing Spanish mine on the south fork of the Yuba River, setting a record for low-cost ore production. He was inducted into the Mining Hall of Fame in 1988.
By 1893, Frederick Bradley assumed management (but not ownership) of the Bunker Hill lead mine, near Coeur d' Alene, Idaho. Between 1894 and 1904 Bradley made the money-losing low-grade ore profitable but at the cost of a civil war between the mining company and the Western Federation of Miners
union. Testimony at the 1906 murder trial of Big Bill Haywood, the union treasurer disclosed the two assassination attempts against Bradley in San Francisco in 1904. Bradley then went off to Alaska to turn two money-losing gold operations into profitable ventures. Mt. Bradley in Alaska is named for him.
Bradley Mining Company first optioned Sulphur Bank mercury mine from Ruddock in 1927 and then purchased the mine and surrounding 700 acres (2.8 km²). The mine was operated under the name, Sulphur Bank Syndicate, but eventually operated as the Bradley Mining Company. Worthen Bradley, Frederick’s son, became assistant superintendent of the mine soon after he was graduated at the University of California, Berkeley
in 1926. He eventually served as president of the Bradley Mining Company.
In later years, Worthen Bradley recalled the Bradleys’ interest in the Sulphur Bank mine was generated by a rise in the price of quicksilver. During the Depression years of the 1930s the mine was active or inactive, dependent upon the price, he told a local newspaper in 1955. “We are trying to do with one shovel and two shifts, what we did with several in World War II," Bradley said in 1955. “We are still in the stage of getting started and hope to begin plant operation this month, September. Unfortunately the quicksilver market has declined
somewhat since we began work,” The Sulphur Bank mercury mine closed permanently in 1957.
. During the war, the demand for quicksilver skyrocketed because of its use in detonator
s in munitions.
Worthen Bradley died at age 55, in 1959. Helen Pope Bradley, who wed Worthen in 1929, engaged in raising show stock, known as Polled Herefords
in 1943. Helen lived until 2006, a month before her 100th birthday.
Worthen Bradley was born Frederick Worthen Bradley but used Worthen as his first name. A son, Frederick Worthen Bradley, an attorney, is now the president of the Bradley Mining Company. The Sulphur Bank Mine and Rancho Solfatara are held by the company and the Worthen Bradley Trust.
The Herman pit, which is filled with acidic water, covers 23 acres (93,077.8 m²) to a depth of 90 feet (27.4 m) and is located 750 feet (228.6 m) upslope of Clear Lake. The Elem Tribal Colony of Pomo Indians is located directly adjacent to the mine property. A freshwater wetland
is located to the north of the mine, and critical habitat for three endangered species
of wildlife, the Peregrine Falcon
, Southern Bald Eagle
, and Yellow-billed Cuckoo
, is less than a quarter-mile from the site.
The mine site has been implicated by the EPA in mercury pollution of Clear Lake, but the allegations are disputed by Bradley Mining Company, the last and current owner of the mine.
's biologist, Larry Week was testing fish samples in 1976 for DDD
, a close relative of DDT
the pesticide, and discovered high levels of mercury in fish tissue.
During the next decade, various state and federal agencies conducted tests of the lake and mine site resulting in the Environmental Protection Agency (EPA) placing Sulphur Bank Mercury Mine in 1990 on the National Priorities List
(NPL) under the Comprehensive Environmental Response, Compensation and Liability Act or CERCLA.
The Agency for Toxic Substances and Disease Registry
was also established by CERCLA under the federal Department of Health and Human Services. The Registry assesses the health hazards and risks at contaminated sites and makes recommendations reducing those hazards. The mine site has been proposed for listing on the NPL since 1988 and the Registry published its report the next year, concluding Sulphur Bank Mine is a public health hazard. (See also Mercury poisoning
.)
In 1990, the EPA began studies on the flooded pit, waste rock piles, lake sediments and a nearby wetland.
The EPA completed an emergency remediation in 1992, where the slope of mine tailings was cut back along the shoreline, covered with clean soil and reseeded.
The agency states that more than 32 acres (129,499.5 m²) of waste rock had been deposited into the lake, and piled up along the shore. The book History of Lake County 1881 gives more detail: "The debris is drawn from the bottom of the furnance about every two hours and is wheeled to the far-distant dump on the lake shore."
Other EPA cleanup actions included an earthen dam built between the flooded acidic open pit (called the Herman Impoundment after one of the mining shafts named Herman) and the shoreline in 1996, a 4000 feet (1,219.2 m) pipeline to divert surface water runoff away from the pit in 1999, and contaminated soil removal from the adjacent
Elem Indian Colony
in 1997.
for a review of the EPA's rulemaking listing the mine site on the National Priorities List, asserting that the agency, "acted arbitrarily and capriciously in listing the property because the EPA failed to demonstrate that mercury found in an adjacent lake was caused by mining operations and because the Agency incorrectly calculated the risk that the mercury would contaminate usable ground water."
The EPA presented a study from 1990 titled Abatement and Control Study: Sulphur Bank Mine and Clear Lake, to support the rulemaking. The EPA asserted that its listing decision was based upon: That mercury levels were much higher closest to the mine site in lake sediment, that the groundwater was at risk for contamination and that soil erosion along the shoreline into the lake is occurring.
The court ruled in favor of the EPA and denied the Bradley petition stating, " Thus, the record provides a sufficient foundation for the EPA's conclusion that an observed release of mercury occurred." The court also added "Given the highly technical issues involved in the Agency's decision to list a facility, this court gives significant deference to the EPA's determination. The judges cited from a ruling in Wisconsin challenging an EPA listing: "[T]he importance of EPA's goals, including protecting human life from potentially disastrous contamination and the congressionally mandated need for speedy action," so that "[i]t is not necessary that EPA's decisions as to what sites are included on the NPL be perfect, nor even that they be the best."
is seeping through the contaminated waste rock and then entering the lake from underground in addition to surface runoff
, leaching mercury into the lake. The source of the acidity may be the flooded Herman pit which has a tested pH
level of 3.2.
This underground system is difficult to study as, "the miners ripped the relatively compact natural sulfide deposit to pieces, jumbled uneconomic minerals together with miscellaneous overburden rock, and piled the resulting poisonous mélange 30 or 40 feet deep over the tunnel-laced rock of the former underground mine. Finding out how water and air flow through the resulting mess is a very difficult task."
This difficulty is shown by tracer experiments conducted by UC Davis in 1997 and 1998 to find the subsurface water flow from the Herman Pit to the lake. The tracers used were Rhodamine
-WT, sulfur hexafluoride
, and a mixture of sulfur hexafluoride and neon-22.
"The three sets of experimental results presented all support a through-flow rate in Herman Pit. Even though it is known that water from Herman Pit is flowing into Clear Lake, it cannot be estimated [emphasis added] from these calculations how much is going into the lake or the precise path the flow is taking" the study noted. "Of the approximate 630 liters per second flowing into and out of Herman Pit, fluid may leave the pit and flow directly into the lake through the waste rock piles, through the native sediment that underlies the waste rock piles, or simply flow elsewhere." wrote S. Geoffrey Schlado, Jordan F. Clark, in the study, Use of Tracers To Quantify Subsurface Flow Through A Mining Pit.
Another theory is of geothermal
springs being the source for inorganic mercury in Clear Lake, as there are abundant springs emanating from the lake bed. Deep core samples of sediments taken in the 1980s show peaks of mercury during prehistoric times that "likely originated from natural processes such as volcanic and/or tectonic activity within the Clear Lake Basin" A report published in Geology, November 1987 theorized, "that mercury-rich geothermal fluids rose along the activated fractures and faults and were discharged into the lake, causing the anomalously high Hg[Mercury] content of the sediments and leading to deposition of the Sulphur Bank Hg deposit. The total amount of Hg discharged into Clear Lake over the past 15,000 years is estimated to be at least 2,400 metric tons."
The EPA-funded research by UC Davis found that total levels of mercury (TotHg) in the lake sediments has "not declined significantly a decade after" the remediation work in 1992 at Sulphur Bank Mine.
Another $1.7 million was agreed upon in a settlement between the EPA and NEC Acquisition Company, the parent company of Earth Energy,Inc., for the costs of re-closing three geothermal wells at Sulphur Bank. The wells were drilled in the 1960s to explore the possibility of geothermal energy production, but of the three test wells at Sulphur Bank, only one was productive and the project was abandoned in the 1980s.
Rick Sugarek, project manager for the Superfund site told the Lake County News in 2009 that the EPA has been working with the state on a cleanup plan, but a main sticking point has been the need to run a treatment plant
to deal with the water in the Herman Pit. "We need to stop that flow, and that's why we need the treatment plant. " The question then is where should the water from the pit be discharged? There is no good answer to that, he said. "One of the options was piping the water to The Geysers
for injection." Sugarek added, " there are legal and technical problems with that plan." The total cost estimates to build a treatment plant and remove all of the mine waste could run between $30 million and $40 million. The Geysers are already receiving treated wastewater from both Lake County and Santa Rosa, in Sonoma County.
A review paper dated Fall 2008 on the Sulphur Bank Mine site remediation, authored by J. Lessl, University of Florida
, Department of Soil and Water Sciences suggests phytoremediation, which is the use of both wild and genetically-modified
plants to take up (hyper-accumulate) and bank the mercury and arsenic in the plant tissue. The plants have been genetically altered for this specific purpose. The report also suggests the less expensive option of adding soil amendments like compost, lime and fertilizer. "This technology relies on the intrinsic ability of organic matter to bind metals, reducing their bioavailability and subsequently allowing vegetation to become established" which would ideally, "impede the spread of water erosion and reduce water ingress and subsequent metal leaching." The suggestions in the review paper are based on several studies, two of which are; Remediation of metal polluted mine soil with compost: Co-composting versus incorporation by Susan Tandy, 2008, and Phytoremediation of toxic elemental and organic pollutants by Richard B. Meager, 2000.
adjacent to the mercury mine property. The Bureau of Indian Affairs
built BIA 120 using Sulphur Bank mine tailings in the 1970s.
The mine tailings and waste rock, in addition to being used for road and house construction in the Elem Indian Colony, was also used by the company Aggrelite in the 1950s. The company operated a concrete
block plant at Sulphur Bank Mine and used the tailings to produce 27 different bricks of varying colors and size. The state Division of Mines report of 1953 described the operation, "Mine dump material, ... is crushed and screened to minus one-half inch and mixed with one-third part of furnace calcines from the dump below the quicksilver plant ... Plant capacity is 2000 bricks per 8-hour shift. The finished product is used locally and trucked to the San Francisco Bay area."
. Veatch had arrived in California at the time of the 1849 California Gold Rush
, became a corresponding member of the California Academy of Sciences
and established the first borax mine in the United States.
“In due time, I again reached the “white hill,” Veatch wrote in a letter that now serves as a history of discovering the Sulphur Bank and Borax Lake. "I now discovered, for the first time, that the “white hill” was mostly a mass of sulphur fused by volcanic heat. The external crust, composed of sulphur mixed with sand and earthy impurities, formed a concrete covering of a whitish appearance, hiding the true
nature of the mass beneath."
“On breaking the crust, numerous fissures and small cavities lined with sulphur crystals of great beauty were brought to light. Through the fissures, which seemed to communicate with the depth below, hot aqueous vapors and sulphurous fumes constantly escaped," Veatch wrote in his letter to the California Borax Company, dated 1857.
Hostility towards the Chinese was also pervasive. Workingmen in California viewed the Chinese as unfair competition. The mine owners could hire four Chinese workers for the price of one white miner. The going price in that era was typically $4 per day for a white miner versus $1 per day for a Chinese man.
Local legend suggests that some Chinese miners were killed at the Sulphur Bank mine when hot springs flooded the mining chambers, scalding the workers. At least one cave-in did occur in October 1881, A New York Times report of the incident alludes to loss of life, but those who died in the accident were not Chinese; The five miners were all of Cornwall, England.
The issue came to a head on Feb 13 1880. The California Legislature amended the state constitution, adding sections forbidding the Chinese from working for wages. The law also threatened the corporate charter of any industry that did not comply. Most of the mine owners discharged their Chinese workers, but Sulphur Bank Quicksilver Mining Company did not. Tiburcio Parrott was arrested Feb. 22 after he gave notice to the California Attorney General A.L. Hart that the company would not comply. He asserted that "he would not be dictated to by any man, or set of men, excepting due process of law." Tiburcio Parrott then sued California in the federal Ninth Circuit District court seeking a writ of habeas corpus
: California had unconstitutionally deprived him of his liberty. Parrot won. In a decision issued March 22, 1880, the court ruled California could only revoke a corporate charter for threatening public health or morals. Additionally the court ruled only the federal government could sign or revoke an international treaty. The Burlingame Treaty
of 1868 was then in force and assured unlimited immigration of Chinese to America and Americans to China. This treaty included the right to work, the court ruled.
Tiburcio Parrott gained his freedom and the Sulphur Bank miners maintained their employment. The situation was more enigmatic at the Great Western mercury mine south of Middletown, also in Lake County. Hundreds of Chinese men in the June census were listed as laborers, noting no association with mining. “I had to discharge all my Chinese,” wrote Andrew Rocca, superintendent of the Great Western Mine in a letter dated, Feb. 14 1880. His daughter, Helen Rocca Goss, wrote that Great Western Quicksilver Mine employed 25 white miners and about 200 Chinese, a number consistent with numbers at Sulphur Bank.
Parrott’s court victory was not popular among the populace nor even in the US Congress, and the Chinese question continued at least until the turn of the century.
was prominent.
"The labyrinth of deep, open pits and trenches, and the acrid dust and evil smells of the locality produce a strong impression on the observer; but even to the geologist, it is an interesting rather than an agreeable one," Becker reported.
He found many interesting things about the mine and made the site world famous after the Encyclopædia Britannica
quoted a synopsis of his theory, mentioning Sulphur Bank specifically in the entry on cinnabar.
Becker, a professor at the University of California, authored The Geology of the Quicksilver Resources of the Pacific Slope, published in 1888 by the United States Geographical Survey.
At the time the mine was explored by Becker in 1887, the Sulphur Bank Quicksilver Mining Company had gone into bankruptcy
after a decade of being one of the highest producing mines in California.
The mine closed in 1883. By the time of the closure it had some shallow open pits and three shafts: The Hermann, The Fiedler and the Parrott. The Hermann and the Fiedler were connected underground, he wrote, and the Fiedler was flooded and overflowing into Clear Lake. Parrott Shaft was named for the mine's principal owners, Tiburcio and John Parrott. Ferdinand Fiedler was the mine superintendent; the naming of the Hermann shaft is lost to history. The spelling also changed to Herman sometime in the 1920s.
Becker came to agree with the Oxland thesis.
There were a number of mysteries about the Sulphur Bank that Becker attempted to solve. Among them was how sulfur had been delivered to the surface of the mine and why the sulfuric acid
, created by oxidation and water had not dissolved the quicksilver deposited in the crevices of a layer of basalt
near the surface.
Becker concluded the sulfur of Sulphur Bank was deposited after the cinnabar had been deposited, because he could find no evidence of acid farther than 20 feet (6.1 m) below the surface of the mine. He wrote the acid would have thrown the cinnabar down, instead of migrating up with the sulfur through the basalt rock which covered the mine site.
But Becker was mystified when the water of the flooded shaft was tested and it contained no quicksilver: "The absence of mercury from these waters was not a little perplexing," he wrote.
He compared Sulphur Bank to similar geology in hot springs at Steamboat Springs, Nevada
, which did contain mercury in solution.
Becker theorized the ammonia
in the water at Sulphur Bank precluded the mercury from the water.
body 8 miles (12.9 km) in diameter and 4 miles (6.4 km) below ground underlies much of southern Lake County, feeding the Geysers geothermal field in the Mayacmas Mountains, Sulphur Bank and many, if not all, of the abandoned mercury mines in Napa and Lake counties.
All of the historically producing mercury mines of the vicinity were associated with mineral or hot springs and all were near the heads of creeks. Among them: Sulphur Bank and the Abbott-Turkey Run mine complexes in the Cache Creek watershed, and the Redington, Manhattan, Oat Hill and the Great Western mines in the Putah Creek watershed.
"It is evident that the water depositing this sinter is closely analogous to that of Sulphur Bank. This is an important fact when considered in connection with other phenomena and will be referred to again," Becker wrote of the abandoned Manhattan mercury mine in northern Napa County. "Accompanying the cinnabar is free gold, which may be found by panning the soil."
in the late 1970s. Becker's observations had been somewhat obscured by the passage of time but that changed when James William Wilder, who bought the old mine from the Knox estate in 1965, showed Gustafson an copy of Becker's 1888 book.
Between 1985 and 2002 Homestake's Mclaughlin Mine recovered $1 billion in gold from the site of the Manhattan and Redington mines during the next 15 years. The site is now the Sylvia and Donald McLaughlin Ecological Preserve, managed by University of California, Berkeley. Among the research projects at the Preserve are whether wetlands can be used to filter heavy metals left from mining activities. McLaughlin maintains the legacy of the only producing gold mine in northern Coastal Range mountains.
The McLaughlin Mine enjoyed a reputation as one of the most ecologically sensitive gold mining operations in the world. Nevertheless, during its last year of operation in 2002, the mine emitted 32,396 pounds of mercury into the environment. It was the largest mercury emitter in California that year.
But other researchers have begun to suspect geothermal hot springs may play a larger role in mercury contamination than previously believed. "Ron ( Churchill - California Division of Mines and Geology ) said that the study shows that even prior to mining activity, weathering and erosion of the naturally elevated mercury soils at these sites would have been contributing
mercury to the watershed," read the minutes of a 2004 symposium regarding mercury contamination of Cache Creek. "Natural hot springs contribute significant inorganic Hg loading to Cache Creek, which transports this loading downstream to the Bay-Delta. Physical, chemical and/or biological processes present at mining sites and/or natural geothermal spring sites methylate Hg locally and transport this bioavailable Hg downstream into Cache Creek."
Mercury is associated with the hot springs and geysers of Yellowstone National Park
in Wyoming, the city of Calistoga
in Napa County, California, and the Mayacamas geysers of Sonoma and Lake counties.
Researchers from the University of California, Davis (studying the mine through grants from the EPA) could find no trace of mercury in the 27 acres (109,265.2 m²) acidic pond now known as the Herman Pit: A parallel to Becker's 1887 observation.
Clearlake Oaks, California
Clearlake Oaks is a census-designated place in Lake County, California, United States. It is located on the extreme south sast of Clear Lake, 13 miles east-southeast of Lakeport, at an elevation of 1,335 feet...
and Clear Lake in Lake County
Lake County, California
Lake County is a county located in the north central portion of the U.S. state of California, north of the San Francisco Bay Area. It takes its name from Clear Lake, the dominant geographic feature in the county and the largest natural lake wholly within California...
, California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...
. The 150 acre (0.607029 km²) mine became one of the most noted mercury
Mercury (element)
Mercury is a chemical element with the symbol Hg and atomic number 80. It is also known as quicksilver or hydrargyrum...
producers in the world.
During the 150 years since the Sulphur Bank was discovered, the area has drawn geologists, inspired unique scientific theories, established constitutional case law and now attracts environmental scientists who study the impact of mercury contamination within the Cache Creek watershed of northern California and the Sacramento River-Delta Region
Sacramento River
The Sacramento River is an important watercourse of Northern and Central California in the United States. The largest river in California, it rises on the eastern slopes of the Klamath Mountains, and after a journey south of over , empties into Suisun Bay, an arm of the San Francisco Bay, and...
and San Francisco Bay
San Francisco Bay
San Francisco Bay is a shallow, productive estuary through which water draining from approximately forty percent of California, flowing in the Sacramento and San Joaquin rivers from the Sierra Nevada mountains, enters the Pacific Ocean...
.
History
Beginning in 1856, the mine was first worked for boraxBorax
Borax, also known as sodium borate, sodium tetraborate, or disodium tetraborate, is an important boron compound, a mineral, and a salt of boric acid. It is usually a white powder consisting of soft colorless crystals that dissolve easily in water.Borax has a wide variety of uses...
. Mining for sulfur
Sulfur
Sulfur or sulphur is the chemical element with atomic number 16. In the periodic table it is represented by the symbol S. It is an abundant, multivalent non-metal. Under normal conditions, sulfur atoms form cyclic octatomic molecules with chemical formula S8. Elemental sulfur is a bright yellow...
began in 1865, and produced 2,000,000 pounds (909,090 kg) in four years. Mercury
Mercury (element)
Mercury is a chemical element with the symbol Hg and atomic number 80. It is also known as quicksilver or hydrargyrum...
ore was mined intermittently by underground and open-pit methods from 1873 to 1957. Sulphur Bank Mine was credited with total output of 92,400 flasks (7.02 million pounds) by 1918. The mine was an important producer during both world wars.
The mine closed in 1957 and is a California Historical Landmark
California Historical Landmark
California Historical Landmarks are buildings, structures, sites, or places in the state of California that have been determined to have statewide historical significance by meeting at least one of the criteria listed below:...
(#428). Sulphur Bank Mine became an Environmental Protection Agency (EPA) superfund site in 1990.
California Borax Co
Although the hot springs of the Sulphur Bank contained borax, the search led Veatch to nearby Borax Lake where the California Borax Company established the first commercial borax mining operation in the U. S. beginning in 1860 and ceasing in 1868. The company established land claims to Borax Lake, the Sulphur Bank and Sulphur Springs in Colusa County.The officers of the California Borax Company included physicians Veatch, William Ayers and Robert Oxland; and lawyers Henry Halleck, Archibald Peachy, William Billings
Halleck, Peachy & Billings
Halleck, Peachy & Billings was one of the leading early law firms in San Francisco, California and specialized in land cases. The firm was organized by Frederick H. Billings and Archibald Carey Peachy in 1849, who were joined soon after by Henry Wager Halleck. Halleck, Peachy & Billings was...
and Solomon Heydenfeldt
Solomon Heydenfeldt
Solomon Heydenfeldt was the first Jewish justice of the Supreme Court of California in the Unitied States. He was elected by direct vote of the people and served from 1852 to 1857....
. The fascination with borax resulted from the fact that boric acid
Boric acid
Boric acid, also called hydrogen borate or boracic acid or orthoboric acid or acidum boricum, is a weak acid of boron often used as an antiseptic, insecticide, flame retardant, as a neutron absorber, and as a precursor of other chemical compounds. It exists in the form of colorless crystals or a...
was critical as a flux
Flux (metallurgy)
In metallurgy, a flux , is a chemical cleaning agent, flowing agent, or purifying agent. Fluxes may have more than one function at a time...
in metal working. All borax at that time was imported, mostly from the Tuscan Lakes
Tuscany
Tuscany is a region in Italy. It has an area of about 23,000 square kilometres and a population of about 3.75 million inhabitants. The regional capital is Florence ....
area of Italy
Italy
Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...
. The California Borax Company did engage in sulfur mining at Sulphur Bank (extracting 2 million pounds in 4 years)
Cinnabar
Cinnabar or cinnabarite , is the common ore of mercury.-Word origin:The name comes from κινναβαρι , a Greek word most likely applied by Theophrastus to several distinct substances...
.
Discovery of cinnabar
Between the time of Veatch’s discovery and the working of sulfur, a minor mining excitement led to the discovery of cinnabar in the northern reaches of Napa County (of which Lake County was then a part). The Silverado rush in the winter of 1858–59 caused “every unemployed man from Soscol to Calistoga turned prospector. Blankets and bacon, beans and hard bread rose to a premium,” reported William T. Montgomery in a light-hearted sketch of the great silver rush that resulted in enormous finds of worthless iron pyrites.But the rush did result in the discovery of cinnabar in 1860. Montgomery, who became a stockholder in the X.L.C.R. mine, is the only known source of the often-repeated tale of Seth Dunham and L.D. Jones discovering cinnabar in a road cut of the Barryessa-Lower Lake Road (now Morgan Valley Road) in what became known as the Knoxville mining district, about a dozen miles south east of the Sulphur Bank in present-day Napa County. The X.L.C.R. became known as the Redington mine a decade later and was second only to the New Almaden mine in production.
Another account of the discovery of cinnabar in the same region is contained in the December 1861 edition of Scientific American
Scientific American
Scientific American is a popular science magazine. It is notable for its long history of presenting science monthly to an educated but not necessarily scientific public, through its careful attention to the clarity of its text as well as the quality of its specially commissioned color graphics...
magazine. “There has been recently opened an extensive cinnabar vein, in Napa County, which promises to be rich. This was discovered by John Newman, of Pope’s Valley. The cinnabar was discovered by means of the fires which are made to burn off the chaparral,” the magazine reported.
Newman became a stockholder of the Phoenix mine in that location. These early discoveries of mercury-bearing ores did not become viable mercury producers until 1872, when the price of mercury and improved smelting methods resulted in the establishment of many mines in Lake and Napa counties.
John and Tiburcio Parrott
In 1873, the defunct California Borax Company was acquired by Tiburcio and John Parrott, William F. Babcock and Darius Ogden MillsDarius Ogden Mills
Darius Ogden Mills was a prominent American banker, philanthropist and, for a time, California's wealthiest citizen.-Biography:...
, for the purpose of quicksilver mining at Sulphur Bank. Until 1875, when the mine shipped 5,218 flasks of mercury, it operated under the name of the borax company but then changed the name to the Sulphur Bank Quicksilver Mining Company.
Tiburcio Parrott was controlling partner of the new company, and it was he who was later jailed when the company refused to abide by a state law excluding Chinese from employment.
Tiburcio’s father, John Parrott, was a wealthy banker. Parrot and Company, of San Francisco was a major landholder and banking firm. John Parrot’s weekend retreat consisted of 17000 acres (68.8 km²) in San Mateo County, California. John Parrot also owned 8% of the giant New Almaden
New Almaden
The New Almaden quicksilver mine in the Santa Teresa Hills in Santa Clara County, California, United States, is the oldest and most productive quicksilver mine in the U.S. The site was known to the Ohlone Indians for its cinnabar long before a Mexican settler discovered the ores in 1820...
quicksilver mine in Santa Clara County.
Babcock was an officer of Parrott and Company and was a partner with Tiburcio Parrott in an import-export company. Mills was also asset rich, founding the Bank of California, but who had stepped down as bank president by the time of the Sulphur Bank mercury mining era. It was Mills who later saved Bank of California
Bank of California
The Bank of California was opened in San Francisco, California, on July 4, 1864, by William Chapman Ralston. It was the first commercial bank in the Western United States, the second-richest bank in the nation, and considered instrumental in developing the American Old West.-History:The ancestor of...
with his personal assets when it failed under William Chapman Ralston
William Chapman Ralston
William "Billy" Chapman Ralston was a San Francisco, California businessman and financier, and was the founder of the Bank of California.-Biography:...
.
The period of 1875 to 1883 was the heyday of the mining activity. The Sulphur Bank Quicksilver Mine often had the highest output after the New Almaden, the New Idria
New Idria, California
New Idria was an unincorporated town in San Benito County, California. It is named after a now-inoperative quicksilver mine of the same name. The mine itself was named in honor of the world's second largest quicksilver mine in Idrija, Slovenia The town grew to support the mining operations, but...
(San Benito County) and the Redington. However, profits were tempered by the temperature of the underground workings. The Chinese miners, who did most of the underground work, had to endure temperatures of 176 °F (80 °C) because the ore body followed the path of at least three hot springs at the site.
The mercury was shipped in iron flasks weighing about 90 pounds each and containing 76.5 pounds of mercury. The closest rail service was 45 miles (72.4 km) away in Calistoga. The wagon trip over the crest of Mt Saint Helena
Mount Saint Helena
Mount Saint Helena is a peak in the Mayacamas Mountains with flanks in Napa, Sonoma, and Lake counties of California. Composed of uplifted 2.4-million-year-old volcanic rocks from the Clear Lake Volcanic Field, it is one of the few mountains in the San Francisco Bay Area to receive any snowfall...
via the Lawley Toll Road to the rail head could take a week or more.
Just how much mercury was shipped from Sulphur Bank is a matter of some estimation. The History of Lake County 1881 puts production at 12,341 flasks in the two-years 1874-1876. Walter W. Bradley, state mineralogist, estimated total output to 1918 at 92,400 flasks. The mine was only sporadically worked after 1883, so the majority of the output can be attributed to the Parrott era.
Eastlake township
The township of EastlakeEastlake, Lake County, California
Eastlake is a former settlement in Lake County, California. It was located just southwest of the Sulphur Bank Mine north-northwest of Lower Lake, at an elevation of 1355 feet ....
was established next to the mine. The mining superintendent, Ferdinand Fiedler listed his address at Eastlake as did assistant superintendent, J.E. Tucker. The German-born Fiedler was the furnace operator and postmaster at the New Almaden mine before taking the post of superintendent at Sulphur Bank. The mine’s owner-investors all lived in San Francisco. Eastlake was directly adjacent to the mining property. After the mine closed, Eastlake was abandoned.
Those who worked at the mine in 1880 constituted an ethnic soup of foreign-born workers. The 1880 federal census, dated June 22, 1880, listed 218 Chinese-born men and 40 Occidentals associated with the mine. Only a few of the white miners were born in the United States. Immigrants from Sweden and Norway constituted the bulk of the European miners. A few of the miners were Irish born as were two Mexicans. Most of the miners had no families present but some of the managers had families and children living at Eastlake. None of the Chinese miners had families present.
Mine workings
The quicksilver mine was partially an open pit and partially a tunneling operation. Three shafts and a series of lateral tunnels known as drifts comprised the underground works. The shafts were known as the Hermann, the Fiedler and the Parrott. From historical documents it appears only the Wagon-Spring Cut and Bath-house Cut (open pits) and the Parrott shaft were used for mining until 1880. By 1881 the other two shafts were also in place, one of which reached 260 feet (79.2 m). Bath-House and Parrott flooded then and were not further used."At Sulphur Bank tunnels were used in developing and mining the ore just under and in the basalt capping. In depth, development and mining proceeded through shallow shafts. Operations from any one shaft were carried on until the hot water and gas made conditions intolerable, when the shaft was abandoned and a new one was sunk a short distance away." Curt Schuette, the author of the US Bureau of Mines bulletin #335 observed.
The cinnabar ore, known also as mercury sulfide
Mercury sulfide
Mercury sulfide, mercuric sulfide, or mercury sulfide is a chemical compound composed of the chemical elements mercury and sulfur. It is represented by the chemical formula HgS...
(84 parts mercury to 16 parts sulfur), was treated in furnaces and retorts near the mine. The essential refining method was to turn the mercury into gas and recondense it to quicksilver. The sulfur would burn and convert to carbon; the waste rock associated with the ore is known as calcine, or burnt rock, would be dumped near the lake shore, out of the way of the mining works. All of the furnaces at all of the mines in the vicinity were wood fired.
End of the Parrott era
The heyday of quicksilver mining came to an end when the price of quicksilver dropped to $25 per flask from a high in 1874 of $120. The Sulphur Bank Quicksilver Mining Company was bankrupt by 1883. Tiburcio Parrot’s biographer states the company’s stock went into default, which suggests the stock was pledged against loans to cover operating expenses. Who the creditors were or to whom the mine was sold is unknown. A specialized census report indicates 2,283 flasks were produced there in 1890, which was a fraction of the output reported during the census of 1880 (10,706 flasks).The township of Eastlake, which included a dry goods store, post office and a hotel-restaurant was abandoned after the mine’s closure.
The mine was apparently inactive through the remainder of the 1880s. Geologist George F. Becker visited the mine several times between 1883 and 1888. Becker’s survey of quicksilver mining in the western United States usually includes the names of watchmen or mine personnel at the sites he studied, but no names are mentioned during his visits to Sulphur Bank. The Fiedler shaft was flooded and overflowing into Clear Lake in 1887. The mine was operated sporadically in the 1890s, evidenced by the presence of mine superintendent Richard White.
John Parrott died in 1884, and his widow, Abigail inherited control of Parrott and Company. Abigail was not the mother of Tiburcio Parrott. He was born 1842, the bastard child of John Parrott and Deloris Ochoa. John Parrott was the American Consul to Mexico at Mazatlan. The War with Mexico in 1845-1846 put a temporary end to the diplomacy business. John Parrott then set up his banking and real estate business in San Francisco in 1848 or 1850.
Tiburcio Parrott was educated in the United States and Europe. After the failure of the mercury mine, he spent the last decade of his life founding and operating a wine estate, near the township of St. Helena, California. There he became closely associated with the German-born Beringer Brothers: Frederick and Jacob. Tiburcio Parrott died in 1894.
In 1901, the Sulphur Bank mine was sold to a group of New York bankers.
Empire Consolidated
By 1902, Sulphur Bank mine was operating as the Empire Consolidated Quicksilver Company and a new shaft, the Empire, was sunk. Riley A. Bogges was listed as owner/ general manager. “It is greatly to be regretted that the management of this property has not taken pains to preserve geological descriptions of the underground works, which are all caved in, except the Empire shaft, now in progress of sinking. The latter is so tightly timbered, owing to bad ground,that it offers no opportunity’ to study the formations through which it has passed,” wrote William Forstner, of California State Mining Bureau. He also observed that Sulphur Bank had the appearance of an abandoned hydraulic mine
Hydraulic mining
Hydraulic mining, or hydraulicking, is a form of mining that uses high-pressure jets of water to dislodge rock material or move sediment. In the placer mining of gold or tin, the resulting water-sediment slurry is directed through sluice boxes to remove the gold.-Precursor - ground...
.
Riley Boggess
Boggess, often spelled as Bogges, (the 1900 census gives the spelling as Boggess ) got the mine mired in court battles in the state of New York, where he also lined up his investors. “Riley A. Boggess had been connected with the mine, and in 1901 he promoted the formation of the Empire Consolidated Quicksilver Mining Company, floated a considerable amount of stock in the East and secured the names of prominent New York capitalists for directors. The new company purchased the Sulphur Banks and the Abbott mines in Lake county, and the Central and Empire mines in Colusa county. The mines were never opened, and the stockholders’ money was wasted. The record of the Sulphur Banks since has been constant litigation and abandoned works, but it is believed by many that rich ore still exists there,” as the history of Mendocino and Lake Counties summarized events.The summary appears reasonably accurate based on New York Times reports: “A big deal in California quicksilver mines was made today when New York capitalists bought for $1,000,000 the Sulphur Bank and Abbot mines in Lake County and Empire and Central, in Colusa County, which are among the largest producers in the world. From the first two mines $2,000,000 in quicksilver has been taken but the Colusa mines are only partly developed,” the paper reported on October 11, 1901. The article lists the buyers as bankers William Dowe, William Kimball, William Scherer, and iron monger Henry Adams as director.
Deal collapses
The deal began to unravel a year later. The broker of the first deal, John T. Reed, won a suit against Boggess, the Times reported July 25, 1902, and in the July 6 edition, the paper noted a lawsuit filed by Katrryn Plumer, of Brooklyn alleging Boggess, Reed, and others had defrauded her of her 1897 investment in the mines. In addition, a July 17, 1902 article related a series of complex stock manipulations involving the Empire Consolidated Quicksilver Mining Company.There is no evidence how Plumer’s claim was resolved, but the millions of dollars allegedly on or under the table boiled down to $750 in cash by 1903. “United State Marshal Henkel sold by auction yesterday 379,985 shares of the stock of the Empire Consolidated Quicksilver Mining Company, which was bid in for $750 by William Hughes of 100 Nassau Street. The stock was seized ... to satisfy a judgement ... against Riley A. Boggess. The stock had been pledged with the North American Trust Company to secure loans. ... ” The Times reported April 21, 1903.
George Ruddock
The Sulphur Bank mercury mine next became the possession of George T. Ruddock, a mining engineerEngineer
An engineer is a professional practitioner of engineering, concerned with applying scientific knowledge, mathematics and ingenuity to develop solutions for technical problems. Engineers design materials, structures, machines and systems while considering the limitations imposed by practicality,...
and amateur botanist, who lived in Alameda in 1910 and San Francisco by 1920. How he came into possession of the property and surrounding acreage is unclear. Walter W. Bradley’s report on quicksilver mining in California lists Ruddock as the owner of Sulphur Bank by 1918 and that Ruddock had the mine under lease to an H.W. Gould.
State mineralogist W.W. Bradley indicated Sulphur Bank had not been worked or de-watered since 1906. The old Empire Consolidated Quicksilver Mining Company was now headed by Riley Boggess’ wife, Emma, which still held possession of the Abbott and other mines near Sulphur Creek in Colusa and Lake counties. Neither the Abbott nor Sulphur Bank were being actively worked.
“For the present at least, no underground work is planned, there being several hundred thousand tons at the surface, estimated as material available for treatment ... Practically all of the dumps in sight and some over the hill on the north side, have concentratable values in cinnabar. The material can be cheaply excavated with a steam shovel and transported to the mill by motor trucks, as it will have to be moved distances up to mile and raised to the top of the mill bin,” Bradley reported.
Whether the plan for mining exclusively by open-pit methods proceeded is uncertain but that method was employed a decade later when the Bradley Mining Company acquired the Sulphur Bank mercury mine.
Bradley Mining Company
Frederick Worthen Bradley, the head and founder of the family-owned Bradley Mining Company, became both famous and infamous in 19th Century American history, unknowingly surviving two assassination attempts and setting records for low-cost ore production. His history is well documented on both the internet and print.There is no known connection between Bradley Mining Company and Walter Wadsworth Bradley, who would become the California State Mineralogist.
Frederick's father, Henry Sewall Bradley came to California to work the gold fields, became a land surveyor instead, and died in 1881 when Frederick Bradley was mid-way through his education at the University of California.
Frederick Bradley dropped out of school, borrowed $5,000 and took over ownership/management of the existing Spanish mine on the south fork of the Yuba River, setting a record for low-cost ore production. He was inducted into the Mining Hall of Fame in 1988.
By 1893, Frederick Bradley assumed management (but not ownership) of the Bunker Hill lead mine, near Coeur d' Alene, Idaho. Between 1894 and 1904 Bradley made the money-losing low-grade ore profitable but at the cost of a civil war between the mining company and the Western Federation of Miners
Western Federation of Miners
The Western Federation of Miners was a radical labor union that gained a reputation for militancy in the mines of the western United States and British Columbia. Its efforts to organize both hard rock miners and smelter workers brought it into sharp conflicts – and often pitched battles...
union. Testimony at the 1906 murder trial of Big Bill Haywood, the union treasurer disclosed the two assassination attempts against Bradley in San Francisco in 1904. Bradley then went off to Alaska to turn two money-losing gold operations into profitable ventures. Mt. Bradley in Alaska is named for him.
Bradley Mining Company first optioned Sulphur Bank mercury mine from Ruddock in 1927 and then purchased the mine and surrounding 700 acres (2.8 km²). The mine was operated under the name, Sulphur Bank Syndicate, but eventually operated as the Bradley Mining Company. Worthen Bradley, Frederick’s son, became assistant superintendent of the mine soon after he was graduated at the University of California, Berkeley
University of California, Berkeley
The University of California, Berkeley , is a teaching and research university established in 1868 and located in Berkeley, California, USA...
in 1926. He eventually served as president of the Bradley Mining Company.
In later years, Worthen Bradley recalled the Bradleys’ interest in the Sulphur Bank mine was generated by a rise in the price of quicksilver. During the Depression years of the 1930s the mine was active or inactive, dependent upon the price, he told a local newspaper in 1955. “We are trying to do with one shovel and two shifts, what we did with several in World War II," Bradley said in 1955. “We are still in the stage of getting started and hope to begin plant operation this month, September. Unfortunately the quicksilver market has declined
somewhat since we began work,” The Sulphur Bank mercury mine closed permanently in 1957.
Rancho Solfatara
Frederick Worthen Bradley, the founder of the company, died in 1933. The son, Worthen then took over operation of the mine and developed a summer estate known as Rancho Solfatara on 800 acres (the mine included 700 acres (2.8 km²); another 100 acre (0.404686 km²) was added in the 1950s) adjoining the mine. Rancho Solfatara, was used first for stock raising to feed the 100 miners who lived there during World War IIWorld War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...
. During the war, the demand for quicksilver skyrocketed because of its use in detonator
Detonator
A detonator is a device used to trigger an explosive device. Detonators can be chemically, mechanically, or electrically initiated, the latter two being the most common....
s in munitions.
Worthen Bradley died at age 55, in 1959. Helen Pope Bradley, who wed Worthen in 1929, engaged in raising show stock, known as Polled Herefords
Hereford
Hereford is a cathedral city, civil parish and county town of Herefordshire, England. It lies on the River Wye, approximately east of the border with Wales, southwest of Worcester, and northwest of Gloucester...
in 1943. Helen lived until 2006, a month before her 100th birthday.
Worthen Bradley was born Frederick Worthen Bradley but used Worthen as his first name. A son, Frederick Worthen Bradley, an attorney, is now the president of the Bradley Mining Company. The Sulphur Bank Mine and Rancho Solfatara are held by the company and the Worthen Bradley Trust.
Present day
The mine currently consists of mine tailings, waste rock and a flooded open pit mine (known as the Herman Impoundment or Herman Pit). Approximately two million cubic yards of mine wastes and tailings remain on the site.The Herman pit, which is filled with acidic water, covers 23 acres (93,077.8 m²) to a depth of 90 feet (27.4 m) and is located 750 feet (228.6 m) upslope of Clear Lake. The Elem Tribal Colony of Pomo Indians is located directly adjacent to the mine property. A freshwater wetland
Wetland
A wetland is an area of land whose soil is saturated with water either permanently or seasonally. Wetlands are categorised by their characteristic vegetation, which is adapted to these unique soil conditions....
is located to the north of the mine, and critical habitat for three endangered species
Endangered species
An endangered species is a population of organisms which is at risk of becoming extinct because it is either few in numbers, or threatened by changing environmental or predation parameters...
of wildlife, the Peregrine Falcon
Peregrine Falcon
The Peregrine Falcon , also known as the Peregrine, and historically as the Duck Hawk in North America, is a widespread bird of prey in the family Falconidae. A large, crow-sized falcon, it has a blue-gray back, barred white underparts, and a black head and "moustache"...
, Southern Bald Eagle
Bald Eagle
The Bald Eagle is a bird of prey found in North America. It is the national bird and symbol of the United States of America. This sea eagle has two known sub-species and forms a species pair with the White-tailed Eagle...
, and Yellow-billed Cuckoo
Yellow-billed Cuckoo
The Yellow-billed Cuckoo, Coccyzus americanus, is a cuckoo. Common folk-names for this bird in the southern United States are Rain Crow and Storm Crow...
, is less than a quarter-mile from the site.
The mine site has been implicated by the EPA in mercury pollution of Clear Lake, but the allegations are disputed by Bradley Mining Company, the last and current owner of the mine.
The EPA years
The discovery of mercury in the fish of Clear Lake was accidental. The California Department of Fish and GameCalifornia Department of Fish and Game
The California Department of Fish and Game is a department within the government of California, falling under its parent California Natural Resources Agency. The Department of Fish and Game manages and protects the state's diverse fish, wildlife, plant resources, and native habitats...
's biologist, Larry Week was testing fish samples in 1976 for DDD
Dichlorodiphenyldichloroethane
Dichlorodiphenyldichloroethane is an organochlorine insecticide that is slightly irritating to the skin. DDD is a metabolite of DDT. DDD is colorless and crystalline; it is closely related chemically and is similar in properties to DDT, but it is considered to be less toxic to animals than is DDT...
, a close relative of DDT
DDT
DDT is one of the most well-known synthetic insecticides. It is a chemical with a long, unique, and controversial history....
the pesticide, and discovered high levels of mercury in fish tissue.
During the next decade, various state and federal agencies conducted tests of the lake and mine site resulting in the Environmental Protection Agency (EPA) placing Sulphur Bank Mercury Mine in 1990 on the National Priorities List
National Priorities List
The National Priorities List is the list of hazardous waste sites in the United States eligible for long-term remedial action financed under the federal Superfund program. Environmental Protection Agency regulations outline a formal process for assessing hazardous waste sites and placing them on...
(NPL) under the Comprehensive Environmental Response, Compensation and Liability Act or CERCLA.
The Agency for Toxic Substances and Disease Registry
Agency for Toxic Substances and Disease Registry
The Agency for Toxic Substances and Disease Registry is a federal public health agency within the United States Department of Health and Human Services. The agency focuses on minimizing human health risks associated with exposure to hazardous substances...
was also established by CERCLA under the federal Department of Health and Human Services. The Registry assesses the health hazards and risks at contaminated sites and makes recommendations reducing those hazards. The mine site has been proposed for listing on the NPL since 1988 and the Registry published its report the next year, concluding Sulphur Bank Mine is a public health hazard. (See also Mercury poisoning
Mercury poisoning
Mercury poisoning is a disease caused by exposure to mercury or its compounds. Mercury is a heavy metal occurring in several forms, all of which can produce toxic effects in high enough doses...
.)
In 1990, the EPA began studies on the flooded pit, waste rock piles, lake sediments and a nearby wetland.
The EPA completed an emergency remediation in 1992, where the slope of mine tailings was cut back along the shoreline, covered with clean soil and reseeded.
The agency states that more than 32 acres (129,499.5 m²) of waste rock had been deposited into the lake, and piled up along the shore. The book History of Lake County 1881 gives more detail: "The debris is drawn from the bottom of the furnance about every two hours and is wheeled to the far-distant dump on the lake shore."
Other EPA cleanup actions included an earthen dam built between the flooded acidic open pit (called the Herman Impoundment after one of the mining shafts named Herman) and the shoreline in 1996, a 4000 feet (1,219.2 m) pipeline to divert surface water runoff away from the pit in 1999, and contaminated soil removal from the adjacent
Elem Indian Colony
Elem Indian Colony
The Elem Indian Colony of Pomo Indians are a Native American band of Pomo based on near Clearlake Oaks, California on the Eastern shore of Clear Lake...
in 1997.
Bradley Mining Company legal action
In 1992, the Bradley Mining Co. petitioned the D.C. Circuit Court of AppealsUnited States Court of Appeals for the District of Columbia Circuit
The United States Court of Appeals for the District of Columbia Circuit known informally as the D.C. Circuit, is the federal appellate court for the U.S. District Court for the District of Columbia. Appeals from the D.C. Circuit, as with all the U.S. Courts of Appeals, are heard on a...
for a review of the EPA's rulemaking listing the mine site on the National Priorities List, asserting that the agency, "acted arbitrarily and capriciously in listing the property because the EPA failed to demonstrate that mercury found in an adjacent lake was caused by mining operations and because the Agency incorrectly calculated the risk that the mercury would contaminate usable ground water."
The EPA presented a study from 1990 titled Abatement and Control Study: Sulphur Bank Mine and Clear Lake, to support the rulemaking. The EPA asserted that its listing decision was based upon: That mercury levels were much higher closest to the mine site in lake sediment, that the groundwater was at risk for contamination and that soil erosion along the shoreline into the lake is occurring.
The court ruled in favor of the EPA and denied the Bradley petition stating, " Thus, the record provides a sufficient foundation for the EPA's conclusion that an observed release of mercury occurred." The court also added "Given the highly technical issues involved in the Agency's decision to list a facility, this court gives significant deference to the EPA's determination. The judges cited from a ruling in Wisconsin challenging an EPA listing: "[T]he importance of EPA's goals, including protecting human life from potentially disastrous contamination and the congressionally mandated need for speedy action," so that "[i]t is not necessary that EPA's decisions as to what sites are included on the NPL be perfect, nor even that they be the best."
UC Davis studies
The tests of lake sediments and water for mercury from 1992 through 1998 show increasingly higher levels of mercury from samples taken closest to the mine site. How the mercury is getting into the lake and its food chain is still unclear. The UC Davis researchers' theory is that acid mine drainageAcid mine drainage
Acid mine drainage , or acid rock drainage , refers to the outflow of acidic water from metal mines or coal mines. However, other areas where the earth has been disturbed may also contribute acid rock drainage to the environment...
is seeping through the contaminated waste rock and then entering the lake from underground in addition to surface runoff
Surface runoff
Surface runoff is the water flow that occurs when soil is infiltrated to full capacity and excess water from rain, meltwater, or other sources flows over the land. This is a major component of the water cycle. Runoff that occurs on surfaces before reaching a channel is also called a nonpoint source...
, leaching mercury into the lake. The source of the acidity may be the flooded Herman pit which has a tested pH
PH
In chemistry, pH is a measure of the acidity or basicity of an aqueous solution. Pure water is said to be neutral, with a pH close to 7.0 at . Solutions with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic or alkaline...
level of 3.2.
This underground system is difficult to study as, "the miners ripped the relatively compact natural sulfide deposit to pieces, jumbled uneconomic minerals together with miscellaneous overburden rock, and piled the resulting poisonous mélange 30 or 40 feet deep over the tunnel-laced rock of the former underground mine. Finding out how water and air flow through the resulting mess is a very difficult task."
This difficulty is shown by tracer experiments conducted by UC Davis in 1997 and 1998 to find the subsurface water flow from the Herman Pit to the lake. The tracers used were Rhodamine
Rhodamine
Rhodamine is a family of related chemical compounds, fluorone dyes. Examples are Rhodamine 6G and Rhodamine B. They are used as a dye and as a dye laser gain medium. They are often used as a tracer dye within water to determine the rate and direction of flow and transport...
-WT, sulfur hexafluoride
Sulfur hexafluoride
Sulfur hexafluoride is an inorganic, colorless, odorless, and non-flammable greenhouse gas. has an octahedral geometry, consisting of six fluorine atoms attached to a central sulfur atom. It is a hypervalent molecule. Typical for a nonpolar gas, it is poorly soluble in water but soluble in...
, and a mixture of sulfur hexafluoride and neon-22.
"The three sets of experimental results presented all support a through-flow rate in Herman Pit. Even though it is known that water from Herman Pit is flowing into Clear Lake, it cannot be estimated [emphasis added] from these calculations how much is going into the lake or the precise path the flow is taking" the study noted. "Of the approximate 630 liters per second flowing into and out of Herman Pit, fluid may leave the pit and flow directly into the lake through the waste rock piles, through the native sediment that underlies the waste rock piles, or simply flow elsewhere." wrote S. Geoffrey Schlado, Jordan F. Clark, in the study, Use of Tracers To Quantify Subsurface Flow Through A Mining Pit.
Another theory is of geothermal
Geothermal
Geothermal is related to energy and may refer to:* The geothermal gradient and associated heat flows from within the Earth- Renewable technology :...
springs being the source for inorganic mercury in Clear Lake, as there are abundant springs emanating from the lake bed. Deep core samples of sediments taken in the 1980s show peaks of mercury during prehistoric times that "likely originated from natural processes such as volcanic and/or tectonic activity within the Clear Lake Basin" A report published in Geology, November 1987 theorized, "that mercury-rich geothermal fluids rose along the activated fractures and faults and were discharged into the lake, causing the anomalously high Hg[Mercury] content of the sediments and leading to deposition of the Sulphur Bank Hg deposit. The total amount of Hg discharged into Clear Lake over the past 15,000 years is estimated to be at least 2,400 metric tons."
The EPA-funded research by UC Davis found that total levels of mercury (TotHg) in the lake sediments has "not declined significantly a decade after" the remediation work in 1992 at Sulphur Bank Mine.
Cleanup plans and costs
In 2005, the EPA placed a lien on 554 acres (2.2 km²) of Bradley-owned property at the mine site to recover cleanup costs estimated at $27 million. Cost estimates for future cleanup go as high as $40 million.Another $1.7 million was agreed upon in a settlement between the EPA and NEC Acquisition Company, the parent company of Earth Energy,Inc., for the costs of re-closing three geothermal wells at Sulphur Bank. The wells were drilled in the 1960s to explore the possibility of geothermal energy production, but of the three test wells at Sulphur Bank, only one was productive and the project was abandoned in the 1980s.
Rick Sugarek, project manager for the Superfund site told the Lake County News in 2009 that the EPA has been working with the state on a cleanup plan, but a main sticking point has been the need to run a treatment plant
Industrial wastewater treatment
Industrial wastewater treatment covers the mechanisms and processes used to treat waters that have been contaminated in some way by anthropogenic industrial or commercial activities prior to its release into the environment or its re-use....
to deal with the water in the Herman Pit. "We need to stop that flow, and that's why we need the treatment plant. " The question then is where should the water from the pit be discharged? There is no good answer to that, he said. "One of the options was piping the water to The Geysers
The Geysers
The Geysers is a complex of 22 geothermal power plants, drawing steam from more than 350 wells, located in the Mayacamas Mountains north of San Francisco, California.The largest in the world, the Geysers has...
for injection." Sugarek added, " there are legal and technical problems with that plan." The total cost estimates to build a treatment plant and remove all of the mine waste could run between $30 million and $40 million. The Geysers are already receiving treated wastewater from both Lake County and Santa Rosa, in Sonoma County.
A review paper dated Fall 2008 on the Sulphur Bank Mine site remediation, authored by J. Lessl, University of Florida
University of Florida
The University of Florida is an American public land-grant, sea-grant, and space-grant research university located on a campus in Gainesville, Florida. The university traces its historical origins to 1853, and has operated continuously on its present Gainesville campus since September 1906...
, Department of Soil and Water Sciences suggests phytoremediation, which is the use of both wild and genetically-modified
Genetically modified organism
A genetically modified organism or genetically engineered organism is an organism whose genetic material has been altered using genetic engineering techniques. These techniques, generally known as recombinant DNA technology, use DNA molecules from different sources, which are combined into one...
plants to take up (hyper-accumulate) and bank the mercury and arsenic in the plant tissue. The plants have been genetically altered for this specific purpose. The report also suggests the less expensive option of adding soil amendments like compost, lime and fertilizer. "This technology relies on the intrinsic ability of organic matter to bind metals, reducing their bioavailability and subsequently allowing vegetation to become established" which would ideally, "impede the spread of water erosion and reduce water ingress and subsequent metal leaching." The suggestions in the review paper are based on several studies, two of which are; Remediation of metal polluted mine soil with compost: Co-composting versus incorporation by Susan Tandy, 2008, and Phytoremediation of toxic elemental and organic pollutants by Richard B. Meager, 2000.
2009 Recovery Act
The American Recovery and Reinvestment Act was passed by the US Congress in February 2009 and provides $600 million for hazardous waste cleanup, with $5 million of that going to Sulphur Bank Mine and access road work. The funds will pay for the remediation on BIA 120, the road to the Elem Indian ColonyElem Indian Colony
The Elem Indian Colony of Pomo Indians are a Native American band of Pomo based on near Clearlake Oaks, California on the Eastern shore of Clear Lake...
adjacent to the mercury mine property. The Bureau of Indian Affairs
Bureau of Indian Affairs
The Bureau of Indian Affairs is an agency of the federal government of the United States within the US Department of the Interior. It is responsible for the administration and management of of land held in trust by the United States for Native Americans in the United States, Native American...
built BIA 120 using Sulphur Bank mine tailings in the 1970s.
The mine tailings and waste rock, in addition to being used for road and house construction in the Elem Indian Colony, was also used by the company Aggrelite in the 1950s. The company operated a concrete
Concrete
Concrete is a composite construction material, composed of cement and other cementitious materials such as fly ash and slag cement, aggregate , water and chemical admixtures.The word concrete comes from the Latin word...
block plant at Sulphur Bank Mine and used the tailings to produce 27 different bricks of varying colors and size. The state Division of Mines report of 1953 described the operation, "Mine dump material, ... is crushed and screened to minus one-half inch and mixed with one-third part of furnace calcines from the dump below the quicksilver plant ... Plant capacity is 2000 bricks per 8-hour shift. The finished product is used locally and trucked to the San Francisco Bay area."
People
Between its rise as a geological wonder and its fall from grace as an EPA superfund site, the Sulphur Bank Mercury Mine was able to attract admirers that reads like a Who’s Who of California History.John Veatch
The first was John Allen Veatch, physician, land surveyor and mineralogist who gave the Sulphur Bank its name in 1856, while on a quest for a domestic supply of boraxBorax
Borax, also known as sodium borate, sodium tetraborate, or disodium tetraborate, is an important boron compound, a mineral, and a salt of boric acid. It is usually a white powder consisting of soft colorless crystals that dissolve easily in water.Borax has a wide variety of uses...
. Veatch had arrived in California at the time of the 1849 California Gold Rush
California Gold Rush
The California Gold Rush began on January 24, 1848, when gold was found by James W. Marshall at Sutter's Mill in Coloma, California. The first to hear confirmed information of the gold rush were the people in Oregon, the Sandwich Islands , and Latin America, who were the first to start flocking to...
, became a corresponding member of the California Academy of Sciences
California Academy of Sciences
The California Academy of Sciences is among the largest museums of natural history in the world. The academy began in 1853 as a learned society and still carries out a large amount of original research, with exhibits and education becoming significant endeavors of the museum during the twentieth...
and established the first borax mine in the United States.
“In due time, I again reached the “white hill,” Veatch wrote in a letter that now serves as a history of discovering the Sulphur Bank and Borax Lake. "I now discovered, for the first time, that the “white hill” was mostly a mass of sulphur fused by volcanic heat. The external crust, composed of sulphur mixed with sand and earthy impurities, formed a concrete covering of a whitish appearance, hiding the true
nature of the mass beneath."
“On breaking the crust, numerous fissures and small cavities lined with sulphur crystals of great beauty were brought to light. Through the fissures, which seemed to communicate with the depth below, hot aqueous vapors and sulphurous fumes constantly escaped," Veatch wrote in his letter to the California Borax Company, dated 1857.
Chinese mine workers
The 1880 Census indicates more than 218 Chinese mine workers at Sulphur Bank Mine. The use of Chinese labor in the underground workings was pervasive in the mines of California.Hostility towards the Chinese was also pervasive. Workingmen in California viewed the Chinese as unfair competition. The mine owners could hire four Chinese workers for the price of one white miner. The going price in that era was typically $4 per day for a white miner versus $1 per day for a Chinese man.
Local legend suggests that some Chinese miners were killed at the Sulphur Bank mine when hot springs flooded the mining chambers, scalding the workers. At least one cave-in did occur in October 1881, A New York Times report of the incident alludes to loss of life, but those who died in the accident were not Chinese; The five miners were all of Cornwall, England.
The issue came to a head on Feb 13 1880. The California Legislature amended the state constitution, adding sections forbidding the Chinese from working for wages. The law also threatened the corporate charter of any industry that did not comply. Most of the mine owners discharged their Chinese workers, but Sulphur Bank Quicksilver Mining Company did not. Tiburcio Parrott was arrested Feb. 22 after he gave notice to the California Attorney General A.L. Hart that the company would not comply. He asserted that "he would not be dictated to by any man, or set of men, excepting due process of law." Tiburcio Parrott then sued California in the federal Ninth Circuit District court seeking a writ of habeas corpus
Habeas corpus
is a writ, or legal action, through which a prisoner can be released from unlawful detention. The remedy can be sought by the prisoner or by another person coming to his aid. Habeas corpus originated in the English legal system, but it is now available in many nations...
: California had unconstitutionally deprived him of his liberty. Parrot won. In a decision issued March 22, 1880, the court ruled California could only revoke a corporate charter for threatening public health or morals. Additionally the court ruled only the federal government could sign or revoke an international treaty. The Burlingame Treaty
Burlingame Treaty
The Burlingame Treaty, also known as the Burlingame-Seward Treaty of 1868, between the United States and China, amended the Treaty of Tientsin of 1858 and established formal friendly relations between the two countries, with the United States granting China most favored nation status...
of 1868 was then in force and assured unlimited immigration of Chinese to America and Americans to China. This treaty included the right to work, the court ruled.
Tiburcio Parrott gained his freedom and the Sulphur Bank miners maintained their employment. The situation was more enigmatic at the Great Western mercury mine south of Middletown, also in Lake County. Hundreds of Chinese men in the June census were listed as laborers, noting no association with mining. “I had to discharge all my Chinese,” wrote Andrew Rocca, superintendent of the Great Western Mine in a letter dated, Feb. 14 1880. His daughter, Helen Rocca Goss, wrote that Great Western Quicksilver Mine employed 25 white miners and about 200 Chinese, a number consistent with numbers at Sulphur Bank.
Parrott’s court victory was not popular among the populace nor even in the US Congress, and the Chinese question continued at least until the turn of the century.
Geology
When geologist George F. Becker explored the Sulphur Bank Mercury Mine in 1887, the odor of hydrogen sulfideHydrogen sulfide
Hydrogen sulfide is the chemical compound with the formula . It is a colorless, very poisonous, flammable gas with the characteristic foul odor of expired eggs perceptible at concentrations as low as 0.00047 parts per million...
was prominent.
"The labyrinth of deep, open pits and trenches, and the acrid dust and evil smells of the locality produce a strong impression on the observer; but even to the geologist, it is an interesting rather than an agreeable one," Becker reported.
He found many interesting things about the mine and made the site world famous after the Encyclopædia Britannica
Encyclopædia Britannica
The Encyclopædia Britannica , published by Encyclopædia Britannica, Inc., is a general knowledge English-language encyclopaedia that is available in print, as a DVD, and on the Internet. It is written and continuously updated by about 100 full-time editors and more than 4,000 expert...
quoted a synopsis of his theory, mentioning Sulphur Bank specifically in the entry on cinnabar.
Becker, a professor at the University of California, authored The Geology of the Quicksilver Resources of the Pacific Slope, published in 1888 by the United States Geographical Survey.
At the time the mine was explored by Becker in 1887, the Sulphur Bank Quicksilver Mining Company had gone into bankruptcy
Bankruptcy
Bankruptcy is a legal status of an insolvent person or an organisation, that is, one that cannot repay the debts owed to creditors. In most jurisdictions bankruptcy is imposed by a court order, often initiated by the debtor....
after a decade of being one of the highest producing mines in California.
The mine closed in 1883. By the time of the closure it had some shallow open pits and three shafts: The Hermann, The Fiedler and the Parrott. The Hermann and the Fiedler were connected underground, he wrote, and the Fiedler was flooded and overflowing into Clear Lake. Parrott Shaft was named for the mine's principal owners, Tiburcio and John Parrott. Ferdinand Fiedler was the mine superintendent; the naming of the Hermann shaft is lost to history. The spelling also changed to Herman sometime in the 1920s.
Oxland theory
Becker sought out the mine to test the theory of Robert Oxland, a physician and mineralogist, formerly on the staff of the Toland Medical College in San Francisco, California who also held a patent for refining tungsten from tin ore. Oxland believed the cinnabar ore at Sulphur Bank had been formed from hot springs. His thesis stated that hot springs brought metals in a dissolved state from igneous rock deep in the earth through a thick block of metamorphised ancient seabed to form cinnabar ore near the surface of the mine. Oxland also believed the cinnabar deposit was continually forming.Becker came to agree with the Oxland thesis.
There were a number of mysteries about the Sulphur Bank that Becker attempted to solve. Among them was how sulfur had been delivered to the surface of the mine and why the sulfuric acid
Sulfuric acid
Sulfuric acid is a strong mineral acid with the molecular formula . Its historical name is oil of vitriol. Pure sulfuric acid is a highly corrosive, colorless, viscous liquid. The salts of sulfuric acid are called sulfates...
, created by oxidation and water had not dissolved the quicksilver deposited in the crevices of a layer of basalt
Basalt
Basalt is a common extrusive volcanic rock. It is usually grey to black and fine-grained due to rapid cooling of lava at the surface of a planet. It may be porphyritic containing larger crystals in a fine matrix, or vesicular, or frothy scoria. Unweathered basalt is black or grey...
near the surface.
Becker concluded the sulfur of Sulphur Bank was deposited after the cinnabar had been deposited, because he could find no evidence of acid farther than 20 feet (6.1 m) below the surface of the mine. He wrote the acid would have thrown the cinnabar down, instead of migrating up with the sulfur through the basalt rock which covered the mine site.
But Becker was mystified when the water of the flooded shaft was tested and it contained no quicksilver: "The absence of mercury from these waters was not a little perplexing," he wrote.
He compared Sulphur Bank to similar geology in hot springs at Steamboat Springs, Nevada
Steamboat Springs, Nevada
Steamboat Springs is a small volcanic field of rhyolitic lava domes and flows in western Nevada, USA, located south of Reno. There is extensive geothermal activity in the area, including numerous hot springs, steam vents, and fumaroles...
, which did contain mercury in solution.
Becker theorized the ammonia
Ammonia
Ammonia is a compound of nitrogen and hydrogen with the formula . It is a colourless gas with a characteristic pungent odour. Ammonia contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to food and fertilizers. Ammonia, either directly or...
in the water at Sulphur Bank precluded the mercury from the water.
Hot springs
A century after Becker and Oxland, geologists now believe a large magmaMagma
Magma is a mixture of molten rock, volatiles and solids that is found beneath the surface of the Earth, and is expected to exist on other terrestrial planets. Besides molten rock, magma may also contain suspended crystals and dissolved gas and sometimes also gas bubbles. Magma often collects in...
body 8 miles (12.9 km) in diameter and 4 miles (6.4 km) below ground underlies much of southern Lake County, feeding the Geysers geothermal field in the Mayacmas Mountains, Sulphur Bank and many, if not all, of the abandoned mercury mines in Napa and Lake counties.
All of the historically producing mercury mines of the vicinity were associated with mineral or hot springs and all were near the heads of creeks. Among them: Sulphur Bank and the Abbott-Turkey Run mine complexes in the Cache Creek watershed, and the Redington, Manhattan, Oat Hill and the Great Western mines in the Putah Creek watershed.
"It is evident that the water depositing this sinter is closely analogous to that of Sulphur Bank. This is an important fact when considered in connection with other phenomena and will be referred to again," Becker wrote of the abandoned Manhattan mercury mine in northern Napa County. "Accompanying the cinnabar is free gold, which may be found by panning the soil."
McLaughlin Mine
That statement got the attention of mining geologist Donald Gustafson of Homestake Mining CompanyHomestake Mining Company
The Homestake Mining Company was one of the largest gold mining businesses in the United States from the 19th century through the beginning of the 21st...
in the late 1970s. Becker's observations had been somewhat obscured by the passage of time but that changed when James William Wilder, who bought the old mine from the Knox estate in 1965, showed Gustafson an copy of Becker's 1888 book.
Between 1985 and 2002 Homestake's Mclaughlin Mine recovered $1 billion in gold from the site of the Manhattan and Redington mines during the next 15 years. The site is now the Sylvia and Donald McLaughlin Ecological Preserve, managed by University of California, Berkeley. Among the research projects at the Preserve are whether wetlands can be used to filter heavy metals left from mining activities. McLaughlin maintains the legacy of the only producing gold mine in northern Coastal Range mountains.
The McLaughlin Mine enjoyed a reputation as one of the most ecologically sensitive gold mining operations in the world. Nevertheless, during its last year of operation in 2002, the mine emitted 32,396 pounds of mercury into the environment. It was the largest mercury emitter in California that year.
Mercury and hot springs
The Environmental Protection Agency has exclusively focused on mining activity at Sulphur Bank as the source of mercury contamination of Clear Lake. This is also the case with the Carson River contamination, which is focused on mercury lost in the environment through gold and silver mining operations.But other researchers have begun to suspect geothermal hot springs may play a larger role in mercury contamination than previously believed. "Ron ( Churchill - California Division of Mines and Geology ) said that the study shows that even prior to mining activity, weathering and erosion of the naturally elevated mercury soils at these sites would have been contributing
mercury to the watershed," read the minutes of a 2004 symposium regarding mercury contamination of Cache Creek. "Natural hot springs contribute significant inorganic Hg loading to Cache Creek, which transports this loading downstream to the Bay-Delta. Physical, chemical and/or biological processes present at mining sites and/or natural geothermal spring sites methylate Hg locally and transport this bioavailable Hg downstream into Cache Creek."
Mercury is associated with the hot springs and geysers of Yellowstone National Park
Yellowstone National Park
Yellowstone National Park, established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872, is a national park located primarily in the U.S. state of Wyoming, although it also extends into Montana and Idaho...
in Wyoming, the city of Calistoga
Calistoga, California
Calistoga is a city in Napa County, California, United States. The population was 5,155 at the 2010 census.-Geography:According to the United States Census Bureau, the city has a total area of , 99.30% of it land and 0.70% of it water.-Climate:...
in Napa County, California, and the Mayacamas geysers of Sonoma and Lake counties.
Researchers from the University of California, Davis (studying the mine through grants from the EPA) could find no trace of mercury in the 27 acres (109,265.2 m²) acidic pond now known as the Herman Pit: A parallel to Becker's 1887 observation.
External links
Footnotes
General references
- California Journal of Mines and Geology supplement, De Argento Vivo-Historic Documents on Quicksilver and its Recovery Prior to 1860 Ca. Dept. of Natural Resources, October 1953
- Goss, Helen Rocca The Life and Death of a Quicksilver Mine Hist. Soc. of S. Ca., 1958
- Carson, Rachel Silent Spring Houghton, Mifflin Co, 1963
- Harrington, Mark R. An ancient Site at Borax Lake Southwest Museum Papers #16, Southwest Museum publ., 1948
- Lukas, Anthony J. Big Trouble Simon and Schuster 1997