Joy Mining Machinery is a manufacturer of surface and underground 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...

 machinery based in Warrendale, Pennsylvania

Warrendale, Pennsylvania

Warrendale is a northern suburb of Pittsburgh, Pennsylvania. It is located in the northwestern corner of Allegheny County. It is the home to the corporate headquarters of Rue 21 and Joy Mining Machinery, as well as the United States Postal Service Pittsburgh Network Distribution Center, one of 21...

, United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. They are an operating subsidiary of Joy Global

Joy Global

Joy Global Inc. is a Fortune 1000 company with an integral role in the mining industry. It manufactures and services heavy machinery used in underground and surface mining. Its underground mining machinery business operates primarily through subsidiary Joy Mining Machinery, a brand known for its...

 Inc.
Joy Global Inc. is a worldwide mining machinery and services company. Through its divisions—P&H Mining Equipment and Joy Mining Machinery - the Company manufactures underground and surface mining equipment and offers related backup services.