ASARCO: Revision history


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  • curprev 21:1121:11, 3 June 2019Nmboomhand talk contribs 14,986 bytes +56 →‎History: Before the advent of open pit mining, underground was utilized. Open pit mining is not the only way to recover this metal, so saying it is required makes the statement false. I corrected that with a more efficient and correct way of explaining it. Resolution Copper in Superior AZ is currently operating a deep underground copper mine, because using an open pit would make the recovery cost prohibitive. undo Tags: Mobile edit Mobile web edit

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