SPECIFIC CHARACTER OF DONSKOY CHROMITES DEVELOPMENT IN COMPLEX MINING AND GEOLOGICAL CONDITIONS

While developing ore deposits at the large depths using uncontrolled caving system the geochemical situation at various sections of the mines field will be controversial. As it is evident from the synoptical analysis of the technological schemes of thick ore deposits development at Donskoy MCC fields, their common feature is generation of the mined out spaces during the second mining, which are compensated with the overlaying rocks mass in the course of uncontrolled caving. This phenomena and its development process have significant meaning in solving the issues of negative technogenic evidences occurrence during underground development of ore deposits. As the result of second minigs with uncontrolled caving system,the geotechnical and geomechanical processes are developing in the overlaying solid mass causing the solid mass weakening and uncontrolled caving. At the same time the parameters and nature of the caving zones are directly correlating to the sizes of the stoping zone, volumes of the extracted ore mass and geotechnical properties of the overlaying rocks mass.