1 The labor organization is simple, and the mining capacity is high (the production capacity of the ore block can reach 120-150T/);
2 The mining workload is small (5-7 m/kT);
3 The pit wood consumption is small, and almost no wood is consumed when returning to the mining room. (0.0009~0.002m 3 /piece);
4 The ore depletion rate is relatively small (4 to 5%);
5 low mining costs;
6 safe and well ventilated;
7 Conducive to mechanized mining. High-efficiency mining and loading machinery can be used.
(In recent years, there have been the use of 8 m3 buckets in the house and column method and 50 tons of dump trucks. In the underground mining method, the degree of mechanization and labor productivity of the room and column method for mining large ore bodies are often Is the highest).
The overall view of the house and pillar method is a promising mining method.
( 2 ) main disadvantages
1 The loss of ore is relatively large, because there are many pillars left in the ore, and these pillars account for about 15-20% of the ore (when the column is left), or more, even up to 40%. Columns are generally not recycled.
2 When the thickness of the ore body is relatively large, roof management is more difficult.
3 It is difficult to conduct a sorting.
(3) The development direction of the room and pillar method
1 Try to reduce the proportion of the pillar
For example, if conditions permit, the continuous pillars should be changed to discontinuous pillars as much as possible, or partially returned to the mining column when returning to the mining room; or the poles can be installed to strengthen the roof, which can increase the size of the mine. To relatively reduce the amount of mineral ore.
2 Study the room-column mining method suitable for the deposit conditions of China's deposits, rock drilling, loading and transporting high-efficiency mechanized equipment.
In short, the room and pillar method is a relatively high degree of mechanization, production capacity and labor productivity is relatively high mining method, commonly used to exploit horizontal or gently inclined ore body, metal mine at home and abroad are widely using this method.
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