A medium-thick ore body trapezoidal top pillar staged rock drilling stage open field followed by filling mining method

Abstract

The invention discloses a medium-thick ore body trapezoidal top pillar staged rock drilling stage open field followed by filling mining method, the ore blocks are arranged along the ore body trend, and the ore block is divided into a one-step stope and a two-step stope. One-step stope and use high-strength backfill to fill the goaf, one-step stope to form trapezoidal top pillars to facilitate filling and topping, one-step stope backfill strength reaches the design index and then recover the second-step stope, two-step stope After the stope is mined, it is filled with low-strength backfill. The invention has the advantages of simple stope filling and capping process, guaranteed capping quality, high capping rate, and can effectively improve the safety of two-step stope mining.

Description

technical field [0001] The invention belongs to the field of underground mining, and in particular relates to a mining method for open field and subsequent filling in a medium-thick ore body with a trapezoidal top pillar segmented rock drilling stage. Background technique [0002] The open-pit mining method in the staged rock drilling stage is one of the main mining methods for the recovery of medium-thick ore bodies with stable ore rocks. In this method, the ore body is divided into subsections, and upward fan-shaped medium-deep holes are constructed in the subsection rock drilling roadway. Step backward blasting, the caving ore is mainly released from the bottom mining structure. This method has the advantages of large stope production capacity, high efficiency and low cost, so it is widely used. Before the filling mining method was popularized, when the medium-thick ore body was mined by the open-pit mining method in the staged rock drilling stage, it was necessary to l...

AI Technical Summary

Problems solved by technology

In order to ensure stope filling and roofing, mine engineers and technicians currently use many methods including: multi-point feeding, pumping forced roofing and expansion roofing, etc., but in reality, none of them can effectively guarantee the rate of filling and roofing. Therefore, during the second-step stope mining, stope collapse often occurs, the ore loss and dilution rate increases, and at the same time, the safety risk of stope mining increases

[0003] For this reason, the present invention provides a medium-thick orebody trapezoidal top pillar segmental rock drilling stage empty stop and subsequent filling mining method, aiming to solve the one-step stope of the segmental rock drilling stage empty stop subsequent filling mining method in the prior art The quality of filling and roofing is not high and the resulting problems such as collapse during the second-step stope recovery process

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