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The Berkeley Pit is a former open pit copper mine in the western United States, located in Butte, Montana.It is one mile (1.6 km) long by one-half mile (800 m) wide, with an approximate maximum depth of 1,780 feet (540 m).
The Anaconda Copper Mine was a large copper mine in Butte, Montana that closed operations in 1947 and was eventually consumed by the Berkeley Pit, a vast open-pit mine. [1] Originally a silver mine, it was bought for $30,000 in 1881 by an Irish immigrant named Marcus Daly from Michael Hickey, a Civil War veteran, and co-owner Charles X. Larabie ...
The Montana Cyanide Process Open Pit Mining Prohibition Initiative, also known as I-137, was a successful initiative on the November 3, 1998 ballot in Montana. It sought to prohibit "new open-pit gold and silver mines that used heap and vat cyanide leach processing". [1]
Lisbon Valley Mining Company Copper ore, open pit, heap leached 10–15 (2018) [9] 17 Miami: Gila County, Arizona: Freeport-McMoRan: Copper ore, leached 5 (2021) [2] 18 Carlota Gila County, Arizona: KGHM Polska Miedź: Porphyry copper open pit, producing copper cathode 3.2 (2018) [10] 19 Pumpkin Hollow (see Anaconda) Lyon County, Nevada: Nevada ...
The Golden Sunlight mine is an open pit gold mine in Jefferson County, Montana, 5 mi (8 km) northeast of Whitehall and 24 mi (39 km) east of Butte, Montana. The mine sits at an elevation of 6,000 ft (1,829 m) on the Bull Mountain range. Owned and operated by Barrick Gold, the mine has been in operation since 1975, and in 2016 produced 34,000 ...
The south-central Montana mine complex includes the Stillwater West and Stillwater East operations near Nye, and the East Boulder operation south of Big Timber. It has lost more than $350 million ...
In 1922, Anaconda bought mining operations in Mexico and Chile; the latter hosted the largest mine in the world and for a time yielded two-thirds of the company's profits. The company added aluminum reduction to its portfolio in 1955. In the 1950s, the company switched over from underground to open-pit mining. In 1960 its operations employed ...
Montana Resources LLP is an American mining company with headquarters in Butte, Montana. The company is owned by businessman Dennis Washington as a unit of The Washington Companies . The company employs about 350 people, and operates the Continental mine, an open pit copper and molybdenum mine at Butte.