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Gold Mine:The largest gold mine in the United States is the Homestake mine at Lead, South Dakota. This mine, which is 8,000 feet deep, has accounted for almost 10 percent of total United States gold production since it opened in 1876. It has combined production and reserves of about 40 million troy ounces.
In the past two decades, low-grade disseminated gold deposits have become increasingly important. More than 75 such deposits have been found in the Western States, mostly in Nevada. The first major producer of this type was the Carlin deposit, which was discovered in 1962 and started production in 1965. Since then many more deposits have been discovered in the vicinity of Carlin, and the Carlin area now comprises a major mining district with seven operating open pits producing more than 1,500,000 troy ounces of gold per year.
About 15 percent of the gold produced in the United States has come from mining other metallic ores. Where base metals- -such as copper, lead, and zinc--are deposited, either in veins or as scattered mineral grains, minor amounts of gold are commonly deposited with them. Deposits of this type are mined for the predominant metals, but the gold is also recovered as a byproduct during processing of the ore. Most byproduct gold has come from porphyry deposits, which are so large that even though they contain only a small amount of gold per ton of ore, so much rock is mined that a substantial amount of gold is recovered. The largest single source of byproduct gold in the United States is the porphyry deposit at Bingham Canyon, Utah, which has produced about 18 million troy ounces of gold since 1906.
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Gold-Stocks.com - Gold Mining Stocks and |
List of gold stocks, mines, gold companies, watchlist(quotes), charts, news, articles, newsletters and information for Barrick, Goldcorp, Harmony, Normandy.
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05-Oct-2005 Hits: 126 Rating: 0.00 Votes: 0
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Barrick Gold Corporation - Home |
Barrick is one of the world’s largest gold mining companies, with operating and ... Our vision is to be the world’s best gold mining company by finding,
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05-Oct-2005 Hits: 66 Rating: 0.00 Votes: 0
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Newmont Mining Corporation - Home |
Welcome to Newmont Mining Corporation, The Gold Company of choice. We are the world’s largest gold producer with significant assets or operations on five.
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05-Oct-2005 Hits: 101 Rating: 0.00 Votes: 0
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