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The Homestake Mine was a deep underground gold mine (8,000 feet or 2,438 m) located in Lead, South Dakota. Until it closed in 2002 it was the largest and deepest gold mine in the Western Hemisphere . The mine produced more than forty million troy ounces (43,900,000 oz; 1,240,000 kg) of gold during its lifetime. [1]
Summitville mine: Rio Grande: Surface water, groundwater and soil contamination by copper, cadmium, manganese, zinc, lead, nickel, aluminum and iron, leaching into the Alamosa River system from an isolated former mine at 12,500 ft altitude. [27] 05/10/1993: 05/31/1994 – – –
The project consisted of an oil shale mine and pilot-scale shale oil plant, which used the TOSCO II retorting technology, developed by Tosco Corporation. Over time the project was developed by a consortium of different companies until it was terminated by Exxon on 2 May 1982 a day which is known amongst locals as "Black Sunday". [1] [2] [3]
The Cripple Creek & Victor Gold Mining Company began the first large-scale open pit mining in the district in 1994. [28] The Cresson mine open pits are located a few miles north of Victor. Mining continues today under the ownership of Newmont Corporation , which boosted gold production from 211,000 troy ounces (6.6 t) in 2014 to 451,000 troy ...
The first Knights of Labor mining labor organization in Colorado was formed by Erie coal miners. [64] Mining labor unions continued to be formed thereafter. [46] 1877 lead Leadville Lead was found in California Gulch, which led to construction of a smelter that year, and soon after the founding of the town named Leadville. [65] 1874 gold Lake City
Black Hills Gold Rush Towns. Arcadia. ISBN 9780738577494. Wolff, David A. (2003). "No Matter How You Do It, Fraud is Fraud: Another Look at Black Hills Mining Scandals". South Dakota History. 33 (2). South Dakota Historical Society Press; McDermott, John D., ed. (2012). Gold Rush: The Black Hills Story. South Dakota State Historical Society Press.
On November 25, 2002, Black Hills Corporation announced that its new independent public accountants, Deloitte & Touche LLP, had completed the audit of Black Hills Corporation's 2001, 2000 and 1999 financial statements that were originally audited by Arthur Andersen LLP. [4] In 2004, Black Hills acquired Cheyenne Light from Xcel Energy. Cheyenne ...
Eleven coal mines operate in Colorado, including eight underground mines in Delta, Garfield, Gunnison, La Plata, Rio Blanco, and Routt counties, and three surface mines in Moffat and Montrose counties. All active coal mines are on the western slope, although the New Elk coal mine in Las Animas County is expected to reopen in 4th quarter 2010 ...