DESCRIPTION: Flotation of cyanide tailing after a Merrill-Crowe gold recovery circuit.
ORE TREATED: Where ore bodies at depth have become more refractory and flotation ahead of cvanidation would call for major and expensive mill alterations, the sulphide minerals containing the undissolved precious metals can be recovered by flotation and shipped to the smelter. In some cases it is possible to make a selective separation of the auriferous sulphides wherein this is impossible if using flotation ahead of cvanidation.
PROCESSING COMMENTS: Success depends on an effective and thorough wash of the cyanide tailing to minimize residual cyanide and lime in the flotation circuit. This flowsheet is not recommended unless other more simple methods fail.