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The processes of gold and palladium concentration by lowland peat and humic acids and nonhy drolyzed residue separated from it in a pH range characteristic of surface water were experimentally studied at the stage of peat formation. It was established that the interaction of peat with the complex chloride anions of noble metals occurs by reducing sorption. A higher affinity of the test sorbents for the complex anions of gold, as compared with that of palladium, was revealed. The experimental data suggest that gold and palla dium can be quantitatively precipitated on naturally occurring geochemical barriers.

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The mechanism of the stepwise dissolution of coal was investigated. It was found that the step by step demineralization of extraction residues facilitated the quantitative extraction of bitumoids and their acid constituents. The acids were separated in accordance with bond types, and the individual composition of the resulting fractions was analyzed. It was established that more than a third of the organic matter of the test coal has aliphatic nature.