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

48 Domestic Production and Use Domestic mine production of copper in 2010 declined by about 5 to 112 million tons but its value rose to about 84billion The principal mining States in descending. 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 6 billion was produced by 120 companies from 177 operations in 31 State s Leading States were in order of tonnage produced Wisconsin Illinois Texas Minnesota Oklahoma Arkansas Michigan and Iowa Combined production from these States accounted for 74 o Based on published market prices the value of primary metal production was 407 billion Aluminum consumption was centered in the East Central United States Transportation accounted for an estimated 36 of domestic consumption the remainder was used in 94 Domestic Production and Use The only commercially active lithium mine in the United States was a brine operation in Nevada. The mine’s production capacity was expanded in 2012, and a new lith 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 106 Domestic Production and UseIn 2013, molybdenum, valued at about $1.4 billion (based on an average oxide price), was produced at 11 mines. Molybdenum ore was produced as a primary product at thre 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 Domestic Production and UseA tungsten mine in California produced concentrates in 2013. Approximately eight companies in the United States processed tungsten concentrates, ammonium paratungstate, tun 186 Domestic Production and UseThe value of zinc mined in 2013, based on zinc contained in concentrate, was about $1.60 billion. Zinc was mined in 4 States at 14 mines operated by 4 companies. Two f 46 Domestic Production and Use Significant U.S. cobaltmine production has not been reported since 1971, and production of refined cobalt from imported nickelcoppercobalt matteceased in 1985. U.S. sup 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 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