PDF-COPPER Data in thousand metric tons of copper content unless otherwise noted Domestic

S mine production of copper in 2012 increased by 4 to about 115 million tons and was valued at about 9 billion Arizona Utah New Mexico Nevada and Montana in descending order of production accounted for more than 99 of domestic mine production copper. Silver was produced at 3 silver mines and as a byproduct or coproduct from 39 domestic base and precious metal mines Alaska continued as the countrys leading silver producing State followed by Nevada There were 14 US refiners that indicated producti The total value was estimated to be about 16 billion Twenty eight companies operated 61 plants in 16 States The estimated percentage of salt sold or used by type was salt in brine 46 rock salt 36 vacuum pan 11 and solar salt 7 The chemical industry 94 Domestic Production and Use The only active lithium carbonate plant in the United States was a brine operation in Nevada. Two companies produced a large array of downstream lithium compounds in th 98 Domestic Production and UseIn 2013, magnesium was produced by one company at a 63,500tonperyear plant in Utah by an electrolytic process that recovered magnesium from brines from the Great Salt L 108 Domestic Production and UseThe United States had only one active nickel mine in 2013a greenfield, underground operation in Michigan. Contractors completed the main decline tunnel of the new chal 122 Domestic Production and UseIn 2013, the production value of marketable potash, f.o.b. mine, was about $649 million. Potash was produced in Michigan, New Mexico, and Utah. Most of the production 48 Domestic Production and Use Domestic mine production of copper in 2010 declined by about 5% to 1.12 million tons but its value rose to about $8.4billion. The principal mining States, in descending 70 Domestic Production and UseIn 2013, domestic production of crude gypsum was estimated to be 16.3 million tons with a value of about $130 million. The leading crude gypsumproducing States were, in Domestic Production and UseIn 2014, an estimated million tons (21 million short tons) of quicklime and hydrate was produced (excluding commercial hydrators), valued at about $2.2 billion. At yearend, 158 Domestic Production and Usemestic talc production in 2013 was estimated to be 531,000 tons valued at$18 million. Four companies operated six talcproducing mines in four States in 2013. The top t 66 Domestic Production and UseIn 2014, domestic gold mine production was estimated to be about tons, % less than in 2013, and the value was estimated to be about $8.llion.Gold was produced at about Domestic Production and UseIn 2014, the United States produced approximately 1,170 tons of silver with an estimated value of $718 million. Silver was produced at 3 silver mines and as a byproduct or 26 Domestic Production and UseIn 2014, bauxite consumption was estimated to be 9.6 million tons, nearly all of which was imported, worth an estimated 269 million dollars. More than 95% of the bauxit 34 Domestic Production and UseBromine was recovered from underground brines by two companies in Arkansas. Bromine often isthe leading mineral commodity, in terms of value, produced in Arkansas. The