Kremikovtzi iron ore deposit has been developed from 1963 to 2004. The deposit contains iron ore with major minerals hematite, limonite and siderite. During the long years of treatment has not been found optimal scheme for the extraction of iron. The detailed study of siderite mineralization could lead to a better scheme for enrichment of siderite ores. In the siderite ore have been observed presence of manganese, magnesium and calcium in crystal structure of the minerals. Chemical formula of the mineral siderite from Kremikovtzi deposit is approximately (Fe_(0.66)Mn_(0.20)Mg_(0.13)Ca_(0.01))CO_3. Ratio of Fe:Mn is approximately 4:1 it will be in final concentrate after beneficiation with conventional methods.
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