Stage mining method for mining in the deep hole
i) Use medium and deep hole to mine:
1 When using the medium-deep hole to mine, the rock blasting work is carried out on the platform in the rock drilling patio or on the hanging plate.
The minimum resistance line of the 2 horizontal fan-shaped deep holes is 1.5 to 2.0 meters.
3 In order to avoid the impact of the dirty winds on the rock drilling during the secondary crushing, in general, after the blastholes in a mine are all finished, the blasting is carried out. (concentrated rock drilling, divided blasting).
4 horizontal holes, also to tilt up 5 ° ~ 7 °, the purpose is:
a) convenient for rock drilling;
b) b) is beneficial to the discharge of rock powder;
c) Prevent the hole from moving down - caused by the weight of the drill rod.
Ii) using deep hole falling ore
1 When using deep holes to mine, the rock drilling work is carried out in the rock drilling space;
2 The minimum resistance line of horizontal fan-shaped deep holes is 2.5-3.5 meters;
3 Drilling deep hole chamber specifications.
If a row of holes is used, the chamber is 2.0 to 2.2 meters high; if two rows of holes are used, the chamber is 2.8 meters high;
[Note] Pay attention to a problem when deep hole blasting. That is, when the first blasting is performed, since the bottoming space is not large and the stability of the bottom column is to be protected at the same time, it is generally first blasted, 1-2 rows of holes, and the number of rows can be gradually increased later, so as to reduce the total number of blasting times. .
2) Mining
1 Each time the blasted ore can be released, it can also be retained in the mine, but it is not used as a means of maintaining the surrounding rock, but only plays a role in regulating the amount of ore.
The 2-stage mining method generally uses electric shovel mining. The bucket capacity of the electric winch is 28 to 55 KW, and the volume of the bucket is 0.3 to 0.5 M3.
Due to the use of deep hole falling ore, the large block can reach 20-30%, so the amount of secondary crushing is large. This has a great impact on the efficiency of the mining. (Secondary crushing work is carried out in the electric tunnel. Generally, several medicines are covered and collapsed. At present, most of the mine workers are using large-scale floating medicine to break down large blocks.)
3) Ventilation during recovery
Ventilation in the mining room is relatively simple. When drilling rock, the rocking patio is connected to the return airway, and the ventilation is better.
During the mining period, the secondary crushing level should have a special return airway to ensure that the guns after the secondary crushing can be discharged quickly.
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