Authors: G.P. Neobutov, V.P. Zubkov, D.N. Petrov

Title of the article: Study of the influence of the moisture degree of the broken rock mass on its congelation at drawing

Year: 2017, Issue: 5, Pages: 5-9

Branch of knowledge: Earth sciences

Index UDK: 622’1:622.142.2[551.34]

DOI: 10.26730/1999-4125-2017-5-5-9

Abstract: The use of development systems with caving and drawing of ore has a number of advantages over other sys-tems, especially in remote areas of the Republic of Sakha (Yakutia), which are characterized by high materials transportation costs. Development of deposits in these conditions is characterized by the presence of cryolite zone, which causes a negative temperature regime of the mine workings network. One of the main factors complicating drawing of ore under these conditions is the possibility of ore freezing in the mining area in case of contact with water or warm air. At present, an effective way to prevent broken ore freezing in the block is to control the air temperature in the mine workings and increase the discharge intensity. To develop measures preventing freezing of ore in the mine working, it is necessary to determine the critical values of moisture and temperature for various design parameters of the mining method used. The method and results of physical modeling of the process of bottom drawing of the rock mass from the block model with geometric similarity of the model elements and the nature on a special stand, simulating min-ing unit of steeply dipping veins with an average thickness. The stand presents a welded metal structure with transparent walls. The significant influence of the moisture on ore losses due to its freezing has been established. When the ore moisture is from 0.3 to 3% of its volume and it is fozen at temperatures of -3, -4, -5 and -7 ° C, its losses amount to 1.5 - 3 and to 50 - 55%. In this case, a decrease in temperature in the indicated range does not cause abrupt changes with the same moisture. The obtained results make it possible to present a qualitative characteristic of the influence of the thermal and moisture conditions of underground mining of permafrost deposits on the ore recovery indicators at its drawing, which is the basis for developing recommendations for increasing the efficiency of their development.

Key words: Permafrost underground mine rock freezing ore drawing physical modeling experiment ore losses

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