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Placer Gold Mining in Colombia - 911 MetallurgistMar 6, 2017 . In giving my opinion of the importance of Colombia as a field for investment for those interested in mining for the precious metals, I must begin.colombia minera crusher,sustainable development report - CollahuasiCompañía Minera Doña Inés de Collahuasi SCM – hereinafter,. Collahuasi – has .. Ore from basic crushing .. States, Canada, Ecuador, Colombia, Brazil, El.