Copper Statistics and Information | Geological Survey
Copper Recycling in the United States in 2004 Circular 1196X; Cr, Cu, Mn, Mo, Ni, and Steel Commodity Price Influences OpenFile Report 2007–1257; Estimate of Undiscovered Copper Resources of the World, 2013 Fact Sheet 2014–3004; Estimated Water Requirements for the Conventional Flotation of Copper Ores OpenFile Report 2012–1089
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