Stepped low-depletion mining method with combination of vertical medium-length holes in steeply inclined thin vein

Abstract

A steeply inclined thin vein vertical medium-length hole combined stepped low-depletion mining method comprises the steps and conditions that an ore body is segmented in the depth direction, and the height of each segment is smaller than that of a stable segment of ore rock; each upper section and the corresponding lower section form a stoping stage, all the stages are connected and communicated through the slope ramps and are provided with roadways along the vein, the roadways along the vein of the lower sections serve as a space for ore body blasting, an ore receiving roadway and a transportation road for stage mining, and the roadways along the vein of the upper sections serve as drilling roadways for the upper sections to penetrate through downward medium-length holes; after stoping and filling in the stage, the along-vein roadway continues to be used by the lower subsection of the lower part of the previous stage; chambers are divided, and the chambers are arranged in the areas of the roadways outside the vein at intervals in the trend of the ore body; the method comprises the following steps: stoping chambers in a retreating manner, determining the priority of mining in an area in which an out-of-vein roadway is arranged, stoping of a lower section in each chamber needs to retreat in a stepped manner before stoping of an upper section by two blasting cycles, an upward medium-length hole is adopted in the lower section, a downward medium-length hole is adopted in the upper section, blasting is carried out simultaneously, and the chambers are filled after stoping. The blasting clamping force is effectively controlled, the maximum explosive loading amount of single-time blasting is small, the over-blasting amount is low, the blasting dilution rate is optimal, and the ore supply grade is high.

Description

technical field [0001] The invention relates to mining technology, in particular to a step-type low-dilution mining method combining steeply inclined thin veins up and down to medium and deep holes. Background technique [0002] Currently, there are mainly three types of mining technologies for steeply inclined thin veins: shallow hole retention method, wall cutting and filling method, and layered filling method. These three traditional mining methods have their own advantages and disadvantages, but they all have the following deficiencies or problems more or less: first, the mining capacity is extremely low due to shallow hole blasting; Third, the mining cost is high, and the economic benefit of the mine is relatively poor. [0003] For this reason, the application of medium and deep hole blasting technology with thick ore bodies in steeply inclined thin veins is an important research direction at home and abroad. The pinching force is relatively large. In order to resist...

AI Technical Summary

Problems solved by technology

[0005] The task of the present invention is to overcome the deficiencies in the prior art, and provide a stepwise low-dilution mining method combining steeply inclined thin veins up and down to medium and deep holes, It can not only realize high-efficiency mining of steeply inclined and thin veins, greatly reduce the amount of mining engineering, but also effectively control the common problem of high dilution rate of medium and deep hole blasting in the application of steeply inclined and thin veins, and realize the scale of steeply inclined and thin veins Mining, greatly improving the economic benefits of mines

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