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Udokan copper deposit in the Chita region
USSR. Chita Region. Foreman of the tunneling team of the Udokan geological exploration expedition A. F. Polozencev (in the foreground) and tunnelers I. F. Shmatkov, Yu. Serebryannikov (from left to right in the background) working on detailed exploration of the Udokan copper deposit to determine the optimal option for mining and ore processing technology. Grigory Kalachyan/TASS