Authors: B.A. Anfyorov, L.V. Kuznetsova

Title of the article: Reduction of coal losses by combined open cast and under-ground mining of periferal reserves from the pit side

Year: 2019, Issue: 1, Pages: 78-85

Branch of knowledge: Geotechnology

Index UDK: 622.275

DOI: 10.26730/1999-4125-2019-1-78-85

Abstract: The urgency of the problem. When an economically reasonable limit stripping ratio is reached, mining at the open-pit mines is stopped. In the subsoil beyond the design contours of the pits, in the sides and at the bottom, large reserves of coal are irretrievably lost. To reduce these losses, combined opencast and underground technologies of Highwall mining system are used to mine the peripheral reserves from the flank of the pit. In Russia, this technology is known on the basis of the equipment complex Superior Highwall Miners (SHM) under the brand KGRP (complex deep seam development). The main problems of this system and the reasons for stopping its use are large losses of coal in pillars (up to 60%), high accident rate of clearing faces due to their destruction and roof falling on the equipment. The purpose of the study. To develop technical solutions to reduce the loss of coal in the subsoil of the design contours of the sections by cleaning-up the pillars and increasing the stability of the roof in driven workings. Research methodology. The generalization and analysis of existing technologies for cleaning-up the coal reserves from the side of the pit and of the promising fields of their development. Results of work and area of their application. Coal mining beyond the design contours of the pits can be performed using the KGRP technology. It is proposed to equip the continuous miner with additional equipment - a remote-controlled roof bolter. Roof bolting in the driven mine workings will make it possible: to mine adjacent pillars in seams of medium thickness; to implement slicing methodology in development of thick seams (over 4.8 m). Summary. Reduction of coal losses is ensured by clearing-up the peripheral reserves from the side of the pit by the KGRP system, equipped with a remotely controlled roof bolter excluding the presence of people in the mining area. Roof bolting allows us to eliminate the discontinuity of the roof rocks for a longer time and to ensure mining of pillars between workings for medium-thickness seams and slicing of thick seams.

Key words: mining of coal open-pit mine combined opencast and underground mining Superior Highwall Miners losses of coal roof bolting berm of opencast

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