A Pillarless Segmental Caving Method for Dividing an Ore Block Along the Orebody Strike

Abstract

The invention discloses a non-pillar sublevel caving method for dividing an ore block in the direction of an ore body. The non-pillar sublevel caving method comprises the steps that the ore block is divided in the direction of the ore body, the ore block is divided into a step section and division sections, inlet road linking channels and inlet roads are dug in the division sections of the ore block, and a development system and a mining preparation system comprise an air return roadway, a mining area air return courtyard, a mining area draw shaft, a mining area inclined slope 4 and a mining area air inlet courtyard; the mining order of the ore block is from top to bottom, and the mining order of the division sections of the ore block is withdraw mining from both ends to the middle; upwardfan-shaped blast holes are formed in the inlet roads and millisecond blasting is adopted; and one third of ore is recovered after ore blocks in the first division section are subjected to ore breaking, and the rest of the ore is used as an ore covering layer for ore recovery of the next division section. When the previous division section is more than 30m ahead of the next division section, the next step section can perform backstoping at the same time, and the inlet road linking channels are sealed in time after backstopping of the division sections is completed. The non-pillar sublevel caving method for dividing the ore block in the direction of the ore body has the beneficial effects that the engineering quantity of capital construction and the engineering quantity of mining preparation are less, the production time of the mine is greatly shortened and investment of the mine is reduced, and the time of ore removal is shortened.

Description

technical field [0001] The invention belongs to the technical field of underground mining methods, and in particular relates to a pillarless segmental caving method that divides an ore block along the ore body direction with high grade ore, 1 to 2 ore bodies, and thin or medium-thick ore bodies. Background technique [0002] The bottom-pillar-free segmental caving method along the strike usually divides the ore body into multiple ore blocks, and each ore block is arranged with a mining area chute, and then the electric scraper is used to transport the falling ore back to the mining area chute to the center, and at the same time A long-distance rail transportation system is installed at the bottom of the middle section to undertake the transportation task of ore and rock. However, in the mining of some high-grade ore, the number of ore bodies is only 1-2, and the ore body is thin or medium-thick, the infrastructure projects of long-distance transportation systems and multiple...

AI Technical Summary

Problems solved by technology

However, in the mining of some high-grade ore, the number of ore bodies is only 1-2, and the ore body is thin or medium-thick, the infrastructure projects of long-distance transportation systems and multiple mining area shafts are carried out. A lot of time cost has a huge impact on early mining and early capital investment

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