is a major contemporary environmental issue, as is groundwater pollution, mostly by inorganic mercury.

Refractory gold processes

A "refractory" gold ore is an ore that has ultra-fine gold particles disseminated throughout its gold occluded minerals. These ores are naturally resistant to recovery by standard cyanidation and carbon adsorption processes. These refractory ores require pre-treatment before cyanidation can be used. A refractory ore generally contains sulphide minerals,

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