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3minerals mined by adit ore dressing method

Adit: a mining passageway driven horizontally into a mountainside for the purpose of providing access to a mineral deposit.. Autoclave system: an oxidation treatment in which high temperatures and pressures are applied to convert refractory gold-bearing sulfide materials into amenable oxide ore. Backfilling: the process whereby waste material is used to fill the void created by mining an orebody.

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