Abstract
Ensuring minimum losses and dilution of minerals is one of the most critical tasks in the mining of complex-structured mineral deposits. It is quite challenging to comply with such a requirement when employing conventional technology for mining deposits like these together with preliminary rock loosening with a drill and blast method. In addition, when mining mineral deposits, there occur conditions restricting the use of a drill and blast method to prepare for rock excavation due to environmental conditions or the mine’s location in close proximity with secured facilities. At the same time, industrial enterprises produce milling combined machines able to mine half rocks as well as hard rocks without preparation for excavation. However, theoretical and practical experience of the use of this type of machinery for the development of complex-structured deposits is not enough since the use of conventional technology of a layer-by-layer cold milling of rocks will lead to mixing of different types of ores and stripping soils, which will significantly increase the costs of further raw materials processing. For that reason, the possibility and feasibility of using cold milling combined machines at a promising Oshurkovskoe deposit of apatite ores have been studied as part of the research. It has been proposed to divide run-of-mine ore into batches which form elementary flows with specified quality characteristics. An X-ray radiometric method was used for quality control of rock mass mined at the Oshurkovskoe deposit; and a place to install the device on a cold milling machine was determined. The research results have demonstrated the expediency of the use of this method in mining at the Oshurkovskoe field.
Keywords
Cold milling combined machine, complex-structured deposit, quality, losses, dilution, open pit mining.
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