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    in the basic geocoat® process for refractory gold concentrates, the concentrate
    is coated onto a barren, essentially inert, support rock. after biooxidation,
    the heap is reclaimed and the oxidized concentrate is separated from
    the support rock by wet screening. the washed support rock is recycled for
    recoating with fresh concentrate. a potentially attractive option is to coat the
    sulfide concentrate onto low-grade sulfide material which would otherwise
    be stockpiled or discarded as waste. the bacterial action in the concentrate
    coating is also effective in oxidizing the sulfide minerals in the support rock,
    making additional metal values available for recovery. this may allow subcutoff-
    grade material to be brought into the economic reserve. an alternative
    is to use a screened and sized portion of the ore as a support medium. the
    rest of the ore is ground and floated, producing the concentrate that is coated
    onto the support rock fraction for biooxidation.
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