Novel level preparation method for improving annual declining speed of deep mining in open pit mines

Abstract

The invention discloses a novel level preparation method for improving an annual declining speed of deep mining in open pit mines. The method comprises: dividing a deep step of an open pit mine into upper and lower layers, digging an upper layer inlet / outlet trench (1) and an upper layer working trench, after the upper layer rib expanding, digging a lower layer inlet / outlet trench (5) and a lowerlayer working trench so that an upper layer stripping work line (7) is formed, stripping the upper layer in advance, after the lower layer rib expanding (8), simultaneously stripping the upper and lower layers so that the upper and lower layers are combined into a complete step inlet / outlet trench and a step working line, and dipping the next step of an upper layer inlet / outlet trench and a working trench. The method realizes stripping work in the novel level preparation of the deep step of the open pit mine, reduces the trenching work intensity, reduces the new level preparation period, prolongs the years of stable production of the mine, prevents the premature production reduction of the mine, reduces the trenching cost and improves the mine capacity guarantee degree by two stages.

Description

technical field [0001] The invention belongs to the technical field of open-pit mining, and in particular relates to a new level preparation method for increasing the descending speed of deep mining in open-pit mines. Background technique [0002] The new level preparation is the development preparation work that must be carried out for the depth extension and continuous and stable production of open-pit mines. It mainly includes the excavation and exit ditch, section ditch opening and the expansion project required for the next new level. Due to the limitation of the operating space, The equipment that can be arranged is limited. Compared with normal mining and stripping operations, the equipment efficiency is reduced by about 30% during trenching operations. Trenching in open-pit mines has become a control project for new-level preparations. Whether the new-level preparations are timely or not depends on the speed of trenching. The speed of trenching largely determines the...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a new level of preparation for increasing the annual decline rate of the deep mining of the open pit in order to solve the problems of large amount of new level preparation engineering, long new level preparation period, and premature production reduction in the existing deep mining of open pit mines. method, in order to reduce the amount of trenching engineering, to carry out normal mining and stripping operations at this level while preparing for the new level, to prevent deep mining of open-pit mines from premature passive production reduction, and to prolong the stable production period of mines

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