Method for mining inclined or steeply inclined hard thin ore body

Abstract

The invention discloses a method for mining an inclined or steeply inclined hard thin ore body. As for the hard and stable inclined / steeply inclined hard thin ore body, stopes and studs are divided along the trend of the ore body, the height of a stope stage is 15-60 m, and the height of a subsection is 5-20 m. Mining from a middle section of each stope to the two ends or from one end to the otherend according to the overall stoping sequence of the stopes is carried out. Upward or downward medium-length holes are constructed in a rock drilling roadway, the medium-length holes in ore rock boundaries achieve ore rock presplitting, and the medium-length holes in the middle achieve ore breaking after presplitting. Pre-splitting blast holes are blasted by one step pitch before rock breaking blast holes, and the width of the step pitch is 3-5 m. Blasting of the pre-splitting blast holes is advanced to form pre-cracks through communication of the blast holes, and the effects of ore-rock boundary separation and blasting effect blocking are achieved. The rock breaking blast holes are formed in the middles of the stopes, so that the stability condition of the ore body is changed, and natural caving is generated. After stope mining is finished, goafs are filled with tailings or sealed by sealing facilities.

Description

Technical field: [0001] The invention relates to a method for mining a hard and stable extremely thin ore body, in particular to a method for mining an inclined or sharply inclined hard and thin ore body. Background technique: [0002] According to incomplete statistics, there are more than 100 metal mines with thin ore bodies mined in my country. In addition, after the mining of thick and large main ore bodies in most mines, they are transferred to the mining of thin ore bodies and corner ore bodies. Among them, Shandong Gold Linglong Gold Mine, Chihong Zinc and Germanium Rongda Mining, Henan Faende Company, Yunnan Copper Guihua Copper Mine, Zhaojin Mining Dishui Copper Mine and other mines mainly mine thin ore bodies, and the ore bodies of these mines are thin , The stability of the ore rock is good, the loss and dilution rate in the mining process is difficult to control, and the mining cost is high, which greatly limits the mining scale and economic benefits of the mine....

AI Technical Summary

Problems solved by technology

[0003] The obvious difference between thin ore body mining and thick and large mining is that the thin ore body has a small thickness and narrow working space, it is difficult to arrange blastholes, it is difficult to control the mining boundary during blasting, and it is difficult to realize fine mining of thin ore bodies, which leads to difficulties in the mining process. Severe loss and dilution, especially the extremely high dilution rate, resulting in a sharp drop in the grade of the mined raw ore

In addition, the conventional thin ore body mining method is used, the mining efficiency is extremely low, and the production scale of the mine is difficult to guarantee

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