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Example 1 of mining mining method
One copper mineral ore HONGTOUSHAN angle 45 ~ 78 °, the average thickness of 10 ~ 25m, solid ore, ore agglomeration oxidation. The ore body with a thickness greater than 8m has been partially returned to the mining room by the horizontal fan-shaped deep hole stage mining method, and the caving method is returned to the mining column. Due to the loss of mine pillar mining and the depletion, it was changed to post-harvest cementation filling (tail sand, cement, block stone), and the upward horizontal layered tailings filling method was returned to the mining column.
Most of the stope is arranged vertically. The stage height is 60m, the column width is 8m, the top column height is 6~8m, and the bottom column height is 7~13m. The picture below shows the mining of a column in the No. 6 stope of the 73m phase of the mine. The column is hexagonal and has a total length of 100m. Three of them are cemented backfills with a total length of 55m. The remaining three sides are original rocks with a total length of 45m. When the column is pulled down, in order to prevent the pillar from connecting with the original rock too little and falling from the weight, a method of gradually exposing is adopted, and two 2×5m safety pillars are left in the vicinity of the filling body. However, during the upward recovery process, it was found that the blasting around the mine was very uneven, and the pillar was difficult to retain.
Schematic diagram of the No. 6 column in the red-layered mountain to the horizontal layered tailings filling mining method
1—the upper stage transportation lane; 2—stage transportation lane; 3—filling the patio; 4—the ore discharging well;
5—filter well; 6—tail sand cementing filling body; 7—tail sand filling body; 8—block stone tail sand cementing filling
When using the upper blasthole to prevent damage to the filling body, it is required that the edge of the blasthole is 1.5m away from the filling body, increasing the number of holes and reducing the amount of charge in each hole. When the mining is close to the upper roadway, if the safety is poor, the stripping is used for filling. In order to reduce the depletion and loss of ore in the next stage of mining the top column and the bottom column, the first 2 to 3 layers of cemented filling, the cement amount is 145kg/m 3 , and the rest is filled with tailings.
The maximum exposed area of ​​the stope reaches 500m 2 . After the surrounding stope body is exposed, the strength of the filling body sample is measured to be 0.67-4.6 MPa, and the maximum side exposed area is 140 m 2 (length 20 m, height 7 m). Only a small area is partially scattered.