ON THE CONCENTRATING OF NOBLE-METALS BY T HE CARBONACEOUS MATTER OF ROCKS

It is proved that carboxyl functional groups are present in primary ca rbonbearing matter of rocks and also in carbonbearing particles activa ted under the thermal and acid treatment of the samplex of carbonaceou s rocks. Sorption of Au(II), Pd(II) and Pt(IV) on carbonbearing partic les separated from the gold deposit ore rocks was studied. It is shown that sorption of noble metals is brough about in accordince with comp lex-forming mechanism. The formation of stable chemical bond with oxyg enbearing functional groups of carbonaceous matter is responsible for the possibility of noble metal losses as volatile compounds under the thermal treatment of rock samples and losses on account of sorption of noble metals on carbonbearing particles under acid treatment of sampl es. These losses could be extimated as 1-2 orders of magnitude at the analyses of carbonaceous rocks. Analytical procedures leading to elimi nation of losses are suggested.