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Background. Promising raw materials for obtaining calcium and calcium nitrate are marble and limestone from the Zarbant deposit, containing CaO above 52.16%. Purpose. Determination of the composition and decomposition coefficient of the Zarbant mine marble with nitric acid. Methodology. The CaO content was determined by the complexometric method with Trilon B, and nitrogen - by the Kjeldahl method. Originality. It was found that the decomposition coefficient of the Zarbant marble components depends on the concentration, temperature, and decomposition time. Optimum conditions for the process of marble decomposition with nitric acid were found. Findings. It was found that an increase in the concentration of nitric acid to 49.21% and an increase in the rate to 100% contribute to an increase in the yield of calcium nitrate to 90%, an increase in temperature and time increases nitrogen losses by 2%; conditions: concentration and acid feed rate - 49.21% and 100%, temperature - 25-30°C, time - 2 hours. [ABSTRACT FROM AUTHOR]