FIELD: non-ferrous metallurgy. SUBSTANCE: silver is alkalized of thin placer gold at pH 4.6-5.2 in the presence of potassium permanganate, its quantity being 0.5 g/l. Bioorganic compounds being products of metabolism and destruction of Cephalosporium spp and Aspergillus niger cell walls are used during said process. EFFECT: improves efficiency of method.
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