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Udokan copper deposit in the Chita region
USSR. Chita Region. Miners of the Udokan Geological Prospecting Expedition O. Drozdov and I. F. Shmatkov (from left to right) in an exploratory adit during detailed additional exploration of the Udokan copper deposit and determination of the optimal option for mining and ore processing technology. Grigory Kalachyan/TASS