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Refining at the mines as well as at a copper refinery in Amarillo, Texas, produce 375,000,000 pounds (170,000,000 kg) of refined copper each year. ASARCO's hourly workers are primarily represented by the United Steelworkers. ASARCO has 20 superfund sites across the United States, and it is subject to considerable litigation over pollution.
This list of bullion dealers includes notable companies and organizations that deal in precious metals, such as gold and silver. This list is incomplete ; you can help by adding missing items . ( September 2014 )
Engelhard became the world's largest refiner and fabricator of platinum, gold and silver, a producer of silver and silver alloys in mill forms, operator of the world's largest precious metals smelter. They also developed liquid gold for decorative applications [citation needed].
Uranium mining companies of the United States (1 C, 3 P) Pages in category "Mining companies of the United States" The following 57 pages are in this category, out of 57 total.
In metallurgy, refining consists of purifying an impure metal. It is to be distinguished from other processes such as smelting and calcining in that those two involve a chemical change to the raw material, whereas in refining the final material is chemically identical to the raw material. Refining thus increases the purity of the raw material ...
16th century cupellation furnaces (per Agricola). Cupellation is a refining process in metallurgy in which ores or alloyed metals are treated under very high temperatures and subjected to controlled operations to separate noble metals, like gold and silver, from base metals, like lead, copper, zinc, arsenic, antimony, or bismuth, present in the ore.
Arizona's copper production was 60% of the total for the United States. Copper mining also produces gold and silver as byproducts. [2] Byproduct molybdenum from copper mining makes Arizona the nation's second-largest producer of that metal. Although copper mineralization was found by the earliest Spanish explorers of Arizona, the territory was ...
Walter Luhrman founded a precious metals refinery in Jackson, Ohio under the name Jackson Precious Metals in 1974. It would run into financial difficulties in the 1990s and he would sell it to Alan Stockmeister, a Jackson native who own owned many local area businesses, including the local newspaper.
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