What is a large mine? What is the common standard of division?

Large-scale mines refer to mines whose mining resources exceed a certain amount.

Common classification criteria are as follows:

1, building stone10000m3 ≥ 10.

2, building sand, brick clay ore more than 300 thousand tons.

3, shale mine more than 300000 tons.

4. Ten thousand tons of mineral water ≥ 10.

5, coal (underground mining) raw coal more than ten thousand tons 120.

6, coal (open-pit mining) raw coal more than 4 million tons.

7, oil shale, ore more than 2 million tons.

8. Hydrocarbon natural gas 10 billion cubic meters or more 5.

9, carbon dioxide gas 10 billion cubic meters above 5.

10, coal (layer) gas billion cubic meters ≥5.

Extended data:

According to the different stope management methods in the process of ore mining, the mining methods of non-coal miners can be divided into four categories:

(1) Open stope mining method is characterized in that in the mining process, the goaf is mainly supported by temporary or permanent residual pillars, and the goaf is always empty, which is generally used when the ore and surrounding rock are stable.

(2) Caving mining method, that is, with the mining of ore, the mined-out area is filled with overlying strata and footwall rocks of the caving ore body in a planned way to control the ground pressure in the mining area. Generally, it is used when the surrounding rock of ore body is unstable and the surface caving is allowed.

(3) Filling mining method, which is characterized in that when mining, the goaf is supported by the fillings filled in it. This method can effectively maintain the mined-out area, and has low requirements for the stability of surrounding rock, but the production cost is high. It is mainly used in mining conditions with high ore value, sufficient filling materials, no surface subsidence and particularly complicated geological conditions.

Baidu encyclopedia-mine