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ball mill for artisanal mining

Oct 01, 2009· Replacing mercury addition with cyanidation inball millswas implemented in oneartisanalgoldminingoperation in Portovelo, Ecuador, achieving 95% of gold extraction in 8 h ofmillleaching. This technique demonstrated a drastic improvement in gold recovery. It was found to be a simple, inexpensive technique well accepted by local miners

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