Downward layered drift filling mining method for extremely-broken thick and large ore body

Abstract

A downward layered drift filling mining method for extremely-broken thick and large ore bodies comprises the steps of stope arrangement and mining preparation cutting, specifically, outside-vein slope ramps (1) communicated with roadways (7) of all stages are tunneled between adjacent middle sections perpendicular to a vein; the method comprises the following steps of: excavating a slope ramp outside a vein, excavating a segmented connection way (2) from the slope ramp outside the vein, excavating a segmented gate way (3) communicated with the segmented connection way, sequentially excavating two or more layered connection ways (6) from the segmented gate way, excavating a layered connection gate way (5) communicated with the layered connection ways, and excavating a stoping drift (10) from the layered connection gate way; an ore pass (4) is arranged in a layered connection gate way (5), a filling return air raise (12) is tunneled, a filling return air roadway (11) is tunneled at the upper part of the filling return air raise, and a current-stage haulage roadway (8) and an upper-stage haulage roadway (13) are respectively tunneled at the joints between the outside-vein ramp and the current-stage transverse drift (14) and between the outside-vein ramp and the upper-stage transverse drift (9); and blasting, ventilating a stope, stoping and filling a goaf. The tunneling and mining efficiency is improved, the mining safety is improved, and the loss and dilution rate of ore is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of mining, and in particular relates to a backfilling mining method for extremely broken thick and large ore bodies in a downward stratified approach. Background technique [0002] The broken and thick ore body is thick and has high economic value, and many precious metals exist here. However, due to the large ore veins, which are easily broken, unstable, and slumped when exposed, it is very difficult to mine, which seriously affects the mineral resources. development. At present, the original mining method of Huangjindong Gold Mine has high support cost, broken ore body, and extremely unstable stope. Now a SYZ-type hydraulic support method is adopted to support the roof and use small excavators to reduce the mode of mining. Mining cost: Dayingezhuang Gold Mine is extremely slow due to the changeable occurrence of ore bodies and the difficulty in mining broken ore bodies. The combination of the upper wall b...

AI Technical Summary

Problems solved by technology

But the existing method has the risk of collapsing at any time because the ore body is extremely broken. Even if the bolt support and shotcrete support are used, there are certain hidden risks, which are unsafe for mining and personnel. The ore loss and dilution rate will be reduced due to the collapse of ore bodies and surrounding rocks

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