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The underground sulfide deposit, discovered in 2001, may also produce smaller volumes of copper, silver and lead. [3] The five key permits needed for the project to begin are a mining permit, an air permit, a water discharge permit, a wetland permit and a dam safety permit. [4] The state of Michigan issued a draft mine permit in 2016.
Porphyry copper deposit beneath the inactive Magma Mine Permitted [14] Back Forty Mine: Menominee County, Michigan: Gold Resource Corp. Volcanogenic massive sulfide: Northmet St. Louis County, Minnesota: Polymet Mining Copper-nickel-PGM deposit in disseminated and massive sulfides in layered mafic intrusion
Hanover mine - Copper Harbor, Keweenaw County; Hays mine (originally the Pittsburg and Boston mine) - Copper Harbor, Keweenaw County; Haytown mine (originally the Pittsburg and Isle Royale mine) - Haytown, Isle Royale, Keweenaw County; Hecla mine - Hecla location, Houghton County; Hilton mine (originally the Ohio mine) - Greenland
The Copper Country is highly unusual among copper-mining districts, because copper is predominantly found in the form of pure copper metal (native copper) rather than the copper oxides or copper sulfides that form the copper ore at almost every other copper-mining district. The copper deposits occur in rocks of Precambrian age, in a thick ...
A number of byproducts are recovered from American copper mining. In 2013, American copper mining produced 28,500 metric tons of molybdenum, worth about $700–800 million, which was 47% of total US production. [3] In 2014, copper mining produced about 15 metric tons of gold, worth $600 million, which represented 7% of US gold production. [4]
The AI boom will nearly double demand for copper, mining firm BHP told the Financial Times. BHP predicts demand will reach 52.5 million tons a year, 72% higher from 2021 levels.
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In the US, more copper is recovered and put back into service from recycled material than is derived from newly mined ore. Copper's recycle value is so great that premium-grade scrap normally has at least 95% of the value of primary metal from newly mined ore. [80] In Europe, about 50% of copper demand comes from recycling (as of 2016). [81]