When a copper-nickel mine breaks down, an old ore deposit turns to oreSource Time title How a copper ore mine breaks and turns into an ore deposit
By Michael Schmitt, USA TodayPublished October 28, 2017 07:00:00The first mining operations of a new copper ore deposit in South Dakota were conducted by an American company called United States Aluminum.The ore was discovered on an old mine site in Wyoming and was processed by a new company, U.S. Platinum, that also operates in Montana […]