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The Anaconda Copper Mining Company was acquired by ARCO in 1977. [3] F. Augustus Heinze, an investor who had come to Montana to capitalize on the mining industry, used the apex theory in several lawsuits to lay claim to ore from the Anaconda Mines. [1] Heinze purchased a small parcel of unclaimed land on top of Butte Hill.
Mining of Yogo sapphires was exceptionally difficult and remains sporadic today. Even so, Yogo sapphire mining turned out to be more valuable than several gold strikes. [34] The Yogo area also produced small amounts of silver, copper, and iron. [44] Yogo Gulch lies in a region originally inhabited by the Piegan Blackfeet people.
The company formed in 1985 with the purpose of restarting copper mining at Butte. Mining, the town's mainstay and claim to fame, had been stopped several years previously when Anaconda Copper shut down its Butte mines. In 1986, Montana Minerals reactivated the Continental mine, [1] which Anaconda had idled in 1983. [2]
He settled in the capital of Montana Territory, Bannack, Montana, and began placer mining. Though his claim paid only moderately, Clark invested his earnings in becoming a trader, driving mules back and forth between Salt Lake City and the boomtowns of Montana to transport eggs and other basic supplies.
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 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]
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The Stillwater igneous complex is a large layered mafic intrusion (LMI) located in southern Montana in Stillwater, Sweet Grass and Park Counties. The complex is exposed across 30 miles (48 km) of the north flank of the Beartooth Mountain Range. The complex has extensive reserves of chromium ore and has a history of being mined for chromium.