DEPENDENT ORE LOSSES IN DISCHARGE AS A RESULT OF ITS FREEZING SIZE DISTRIBUTION AND PARAMETERS OF WORKING EXCAVATION
Permafrost causes negative temperature regime of mine workings, with the possibility of freezing the ore in the working excavation in the case of contact with water or warm air is one of the main factors complicating the work of mines in these conditions. In connection with the growth of mining in the northern regions to solve regelation minerals during their extraction is of particular relevance, however, in the scientific literature there are no publications dealing with the issue of loss of ore due to its freezing. The object of research is selected Nezhdaninskoe ore deposit, which for many years carried out research work on the introduction of new technological schemes of extraction of ore different research institutions, and where there was freezing together of the rock mass in the working excavation with the discharge of the ore. The method and the results of the simulation of the of the rock mass discharge of model block on a special stand, simulating stope block steeply dipping veins of medium ore body thickness. It was found that with the discharge of a block of ore due to its freezing, with an increase in the average size of a freed rock mass losses increase to 65%, while increasing the stack height from 10 to 17.5 m - from 6 to 27%. Changing the width of the block within 3 - 9 m leads to increased losses from 21 to 26%. The results will be the basis in selecting rational parameters of mining method and discharge of technologies ore, ensuring minimal performance completeness and quality of reserves extraction during the opening of the permafrost zone deposits in similar conditions.