At the Processing Plant, gold and silver are extracted from the ore. The gold processing plant alternates between treating ore from the Martha Mine open pit and from the Favona underground mine.
Ore processing consists of the following stages:
- Addition of process water to form a slurry
- Addition of lime to the ore, and cyanide solution to the slurry, to leach the gold and silver into solution
- Addition of carbon to adsorb dissolved metals and remove them from the slurry
- Stripping the metals from the carbon by acid washing and circulation of a caustic cyanide solution
- Pumping of the barren slurry (tailings) to the tailings storage facility.
- SBM Processing Plant has the capacity to treat up to 1.25 million tonnes per annum of ore.
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