Gaskov, et al., report that the study of base-metal massive sulfide and tin–sulfide deposits in Siberia and the Russian Far East has revealed that the indium content in ores exceeding the average statistical value at similar deposits worldwide could be economically important. Sphalerite and chalcopyrite and chalcopyrite, bornite, and sphalerite are the major indium carriers in the base-metal massive sulfide and tin–sulfide ores, respectively. In addition, base-metal massive sulfide ores have high Cd, Ag, and Te contents, whereas tin–sulfide ores have elevated Ge, Ga, and Nb contents. This has stimulated the investment attractiveness of these deposits.
The authors conclude that:
1) The study of the indium content in base-metal massive sulfide and tin–sulfide deposits of Siberia and the Russian Far East and a review of literature concerning this problem showed that the In content at these deposits exceeds the overall average at similar deposits worldwide; therefore, these deposits are of economic interest.
2) The indium content and its distribution at the Tigrinoe and Pravourmiisky tin deposits, and preliminarily estimated indium reserves for them as 570 and 402 t, respectively, showed that these deposits correspond to economic indium deposits and are comparable with indium deposits worldwide.
3) Sulfide minerals are the major In carriers in the ores: sphalerite and chalcopyrite at base-metal massive sulfide deposits, and chalcopyrite, bornite, and sphalerite at greisen tin–sulfide deposits.
4) High Cd (up to 1620 ppm), Ag (406 ppm), and Te (up to 111.5 ppm) contents were established in the ores of base-metal massive sulfide deposits, whereas elevated Ge (up to 37 ppm), Ga (up to 37 ppm) and Nb (up to 66 ppm) contents were measured in the ores of tin–sulfide deposits. This has stimulated the investment attractiveness of these deposits.
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