The Idarado Mine was a gold mining

Mining

Mining is the extraction of valuable minerals or other geological materials from the earth, from an ore body, vein or seam. The term also includes the removal of soil. Materials recovered by mining include base metals, precious metals, iron, uranium, coal, diamonds, limestone, oil shale, rock...

 operation in the San Juan Mountains

San Juan Mountains

The San Juan Mountains are a high and rugged mountain range in the Rocky Mountains in southwestern Colorado. The area is highly mineralized and figured in the gold and silver mining industry of early Colorado. Major towns, all old mining camps, include Creede, Lake City, Silverton, Ouray, and...

 of Ouray County, Colorado

Ouray County, Colorado

Ouray County is one of the 64 counties of the State of Colorado in the United States. The county population was 3,742 at U.S. Census 2000. As of 2010, U.S. Census data place the population at 4,436. The county seat is the City of Ouray...

. The mine is within the Sneffels-Red Mountain-Telluride mining district. The remains of the operation are visible from the Million Dollar Highway, north of Red Mountain Pass

Red Mountain Pass

Red Mountain Pass elevation is a mountain pass in the San Juan Mountains of western Coloradoin the United States.The pass straddles a divide that separates Ouray and San Juan counties. The pass is named for the nearby Red Mountain 1, 2 and, 3 on the northeast side of the pass...

, between Ouray

Ouray, Colorado

The historic City of Ouray is a Home Rule Municipality that is the county seat and the most populous city of Ouray County, Colorado, United States. The city population was 813 at the U.S. Census 2000 and 1,000 as of the U.S. Census 2010...

 and Silverton, Colorado

Silverton, Colorado

The town of Silverton is a Statutory Town that is the county seat of, and the only incorporated municipality in, San Juan County, Colorado, United States. Silverton is a former silver mining camp, most or all of which is now included in a federally designated National Historic Landmark District,...

. The tunnels of the Idarado extend some 5 miles (8 km) west under 13,000 foot (4,000 m) mountains to the Pandora Mill near Telluride

Telluride, Colorado

The town of Telluride is the county seat and most populous town of San Miguel County in the southwestern portion of the U.S. state of Colorado. The town is a former silver mining camp on the San Miguel River in the western San Juan Mountains...

, a trip of more than 60 miles (100 km) by highway.