A separate mining method for sloping medium-thick ore bodies with unstable false roofs

Abstract

The invention discloses a divided mining method for an inclined medium-thick ore body with an unstable false roof. The ore body is divided into panels along the strike, ore pillars of chambers are divided in the panels and a top pillar is reserved during stoping; an outside-vein slice drift, a layered linking roadway and a trackless stope preparation project of a chute mine are distributed on the upper panel of the ore body, and an upward air roadway is filled and is distributed at a position at the center of the ore pillars of the chambers and close to the lower panel; chambers are mined firstly and the ore pillars are mined secondly in the panels, and the chambers and the ore pillars are mined in an up-down layering manner; the stoping is performed from an ore removal crossdrift, the false roof and the ore body are mined in sequence, after ores are conveyed out by a carry-scraper, the false roof at the lower sub-layer is subjected to caving in advance by shallow holes, waste stones of the false roof are reserved in a stoping field, and the ore breaking compensation height is compensated in a layering filling manner, the stoping is performed on the lower sub-layer, and the laying caving is performed on the false roof after layering ore breaking and ore conveyed out, the operation is repeated for multiple times until the stoping field is stoped completely, and the bottom layer of the stoping field is filled to close to the back. By using the method, the operating safety, high mechanical degree, no removal of the waste stones of the false roof, low production cost, and low ore dilution loss can be realized.

Description

technical field [0001] The invention belongs to the technical field of mining, and relates to a separate mining method for inclined medium-thick ore bodies with unstable false roofs. The method is mainly applicable to ore bodies with a dip angle of 30-50 0 , Inclined medium-thick ore body with a true thickness of 5m to 10m, an unstable false roof but a stable ore body above medium. Background technique [0002] The mining of ore bodies with unstable false roofs has always been a difficult problem in the mining field. Due to the low strength of the false roof, caving is prone to occur during mining, resulting in a large loss rate of ore dilution and affecting operation safety. At present, ore bodies with unstable false roofs mainly exist in underground metal mines, phosphate rocks, and coal mines. According to the characteristics of this type of ore bodies, the pre-controlled roof approach method and the artificial freezing false roof mining method are widely used at home an...

AI Technical Summary

Problems solved by technology

Due to the low strength of the false roof, caving is prone to occur during mining, resulting in a large loss rate of ore dilution and affecting operation safety

At present, ore bodies with unstable false roofs mainly exist in underground metal mines, phosphate rocks, and coal mines. According to the characteristics of this type of ore bodies, the pre-controlled roof approach method and the artificial freezing false roof mining method are widely used at home and abroad. , as disclosed in the patent CN103206215A "a kind of pre-controlled roof filling mining method", this method uses the approach to mine the upper layer, then adopts measures to reinforce the unstable roof, and then mines the lower layered ore body, although the method The dilution rate of ore is reduced, but part of the ore volume needs to be lost for the roof protection of the hanging wall, and long bolts, metal mesh, anchor cables, etc. are used for support according to the thickness of the false roof, which increases the support cost of the false roof and makes the construction difficult Large, poor operation safety; Patent CN102926753A discloses "a mining method for artificially freezing stope roof deep hole collapse and subsequent filling", through artificial freezing method, the unstable false roof is frozen into a stable frozen body, and then mining is carried out. Although this method has good safety and high production efficiency, the cost of false roof freezing is high and the construction technology is complicated

For inclined medium-thick ore bodies with unstable false roofs, there is currently no mining method with simple construction, high safety, and small dilution losses

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