Experimental leaching of ore-bearing rocks of the Darasun gold deposit

Relevance. The need to understand the processes of geochemical transformation of ores under the impact of different reactive solutions, as well as to assess the possible distribution of a number of potentially hazardous elements in landscape components. The efficiency of element extraction during the interaction of ores with different reagents can be used in the development of new, more environmentally friendly technological schemes for their extraction. Aim. To identify the complex of elements that pass into a mobile state during the interaction of sulfide ores of the Darasun deposit with various reagents (H2SO4, H2O2, NH4HCO3). Methods. Experimental modeling of geochemical transformation of ores. Results and conclusions. At interaction of ores with different types of reagents the sulfuric acid solution proved to be the most reactive, it extracts the highest concentrations of sulfide elements (Cu, Pb, Zn, Ni, Sn, Cd, Sr, Co) two times more intensively. Only with this reagent Y, Be, Ga and lanthanides are extracted. Ammonium hydrogen carbonate solution extracts more As, Sb, Bi, Ag, Rb, Cs, In, U and Th than sulfuric acid solution, and only this reagent extracts Mo, Zr, P, Sc, Cr. Al, Cu, Pb, Zn, Ni, Te and Tl pass into the mobile state when interacting with solutions of sulfuric acid and hydrogen carbonate on the ore, and hydrogen peroxides are absent in the filtrate. Potassium and sodium are extracted only by solutions of hydrogen peroxide and sulfuric acid in approximately equal concentrations (correlation coefficient 0.99).