| http://www.w3.org/ns/prov#value | - ul material, in which the gold value in waste materials is dissolved in an organic solventcontaining halogen in an elementary form and a halogen compound followed by re-precipitation of gold therein by the reduction with a reducing agent such as zinc dust, sodium borohydride and the like.This method is also disadvantageous because the gold value dissolved in the medium can be precipitated only by
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