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(1) Nugget layout
The layout of the ore block is divided into two types: the strike direction and the cut direction.
1 Arrange along the strike—When the ore and surrounding rock are relatively stable, when the thickness of the ore body does not exceed 10-15 meters, it is arranged along the strike.
2 Cut and cut arrangement of the ore block--When the thickness of the ore body is >10~15 meters, it is arranged by cutting direction.
(It can be seen from the given dimensions that this value is smaller than the empty field method. Because the surrounding rock is not stable, the exposed area is allowed to be small, so it is bounded by 10 to 15 meters).
(2) Mine length
The length of the mine should generally be controlled within 50 meters. If the ore body thickness exceeds 50 meters, two rows of mine houses are arranged in the vertical direction of the ore body, and a longitudinal pillar along the strike is left between the two rows of mine houses.
(3) Stage height
The height of the 1st stage is generally 30 to 60 meters (usually 35 to 45 meters)
2 The stage height is too large, and there will be some difficulties in production. For example, when the thickness of the ore body is not large, and the inclination of the ore body changes greatly, it will cause difficulty in erecting the flow mine; when the ore body is thick and the amount of ore is large The lower part of the chute is worn and difficult to maintain. (Steel chute can pass 10 to 150,000 tons of ore, and precast concrete chutes generally do not reach 100,000 tons of ore).
[Parameter] The height of the stage is high, and the recovery speed is slow. When the upper layer is recovered, the stability of the ore is reduced.
For the value of the stage height: 1 When the dip angle of the ore body is relatively large, the dip angle and thickness change little, and the ore body and contour rules are used, the larger stage height is adopted; 2 when the exploration type of the deposit is higher, the stage height can be taken. The smaller.
(4) Horizontal exposed area of ​​the mine
The horizontal exposed area of ​​the mine depends mainly on the stability of the ore. When the ore is stable, the horizontal exposed area is between 300 and 500 M2; when the ore is very stable, it can reach 800 to 1200 M2 or more (individual mines reach 2000 M2).
(5) pillar size
1) Width of the column: The width of the spacing depends on the method of mining the column and the stability of the ore and the thickness of the ore body.
When the column is recovered by the filling method, it can be left 7 to 10 meters.
When the ore and surrounding rock are not stable and the ground pressure is large, the larger size should be taken. The column is too small to be subjected to pressure, and it is difficult to return to the mining column; if the column is too large, a large goaf is formed.
When the ore body is very thin (3 to 4 meters of thin veins), it is also possible to leave no column. At this time, the method of pouring concrete partition walls between the mine houses is adopted;
2) Top column thickness
When the upper transport lane needs protection, the top column of 3 to 5 meters thick should be retained according to the stability of the ore and the size of the mine. The absence of a top column simplifies the recovery step and thus reduces ore loss and depletion, but requires the construction of artificial false alleys.
3) Bottom column height
For the filling mining method, since the layout of the mining lane is simple, there are few lanes in the bottom column, and secondary crushing is not performed therein. Therefore, the stability of the ore bottom column is less damaged, so the height of the bottom column can be smaller.
When the mine is located above the main transport lane, the bottom column must be left. Generally, only the bottom column of 2-3 meters high is left in the upper part of the transport lane. (ie a total height of 4-5 meters from the transport level floor).
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