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Gold mining WikipediaGold mining is the resource extraction of gold by mining. As of 2016, the world's largest gold producer was China with 463.7 tonnes. The second-largest producer ...Gold Min

Iron ore WikipediaIron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey ...Magnetit

Iron ore WikipediaLower-grade sources of iron ore generally require beneficiation, using techniques like crushing, milling, gravity or heavy media separation, screening, and silica ...Iron ore