10 samples of calcite crystals were investigated from the Dal negorsk deposit of polymetallic ores, the Far East. The carbon isotopes composition of crystals indicates on combination of different carbon sources (limestones - 1.090 %o, PDB, atmospheric carbonic gas -7 + -10 %o, PDB, water with the dissolved carbonate-ions, graphite -23.182 %o, PDB). Fluctuation of carbon isotopes ratios was revealed on the faces of crystals, which up to 10-15 % from the average composition in the sample.