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Mercury, a major component in the cinnabar-rich rocks in Idria, could be economically extracted to support nearby gold mining and processing operations. Idria eventually became the second most productive mercury mine in North America, producing over 38 million pounds of mercury during its lifetime. Mercury mining operations ceased in 1972, with ...
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The Betze-Post deposits are up to 6,000 feet (1,800 m) long, 600 feet (180 m) thick and 800 feet (240 m) wide. In 2018 the average gold grade was 0.109 troy ounces (3.4 g) per ton for open pit ore, and 0.274 troy ounces (8.5 g) per ton for underground pit ore, for a mine average of 0.230 troy ounces (7.2 g) per ton.
[1] [2] The proposed mine is one of the largest copper resources in North America. [2] Following the passage of the 2015 National Defense Authorization Act , many Native American and conservation groups oppose the copper mine because it will destroy the area above Oak Flat and around the deposit.
The epithermal vein deposit (EVP) is a type of mineral deposit that forms in the shallow subsurface, typically at depths of less than 1,500 meters below the Earth's surface. [1] These deposits are formed by hot, mineral-rich fluids that circulate through fractures and cracks in rocks.
The Pogo mine is a gold mine in the state of Alaska. [2] By 31 December 2017 Pogo had produced 3.6 million ounces of gold at a grade of 13.6 g/t. Annual production for 2020 was 205,878 ounces. [1]
The same reference written by Dr. Karen Wenrich states, “Although these uranium grades are dwarfed by those of the Athabasca Basin unconformity deposits in Canada, it is significant that (1) the breccia pipe mining costs are significantly less for the Arizona deposits, and (2) these ore grades of 0.4-1% are as high or higher than any other ...
The uranium deposits of Bicroft mine occur in a set of eastward-dipping en-echelon lens-shaped dykes of syenite and granite, up to 24 m (80 ft) wide and 120 m (400 ft) long, which extend over an area of about 4.5 square kilometres (1.75 sq mi) within a north–south oriented belt of amphibolite and paragneiss (the eastern part of the Centre ...