(1) The safety is good, all the mining operations are carried out in the mining roadway; at the end of the mining roadway, the general large blocks can flow into the mining roadway, and the secondary crushing work is safer.
(2) The mining method is simple in structure, simple in mining process, easy to standardize, and suitable for large-scale trackless equipment with high efficiency.
(3) High degree of mechanization.
(4) Due to the collapse of the mine and the mining, the step size is the smallest unit. When the local quality conditions are suitable, it is possible to remove the stone and carry out the graded ore.
The main disadvantages of the sublevel caving method without pillars
(1) It is difficult to ventilate the mining roadway. This is due to the fact that the mining roadway is single-headed and cannot be formed through the wind flow. This problem cannot be solved by the mining method itself without changing the structure. A good ventilation system must be established, with local ventilation and dust removal facilities.
(2) The ore loss is depleted. In the normal production situation, in addition to the reasons for the occurrence of ore bodies, the mining method itself is due to the fact that the amount of minerals in the sub-cracking is small, and the contact area of ​​the ore is large when the ore is discharged, so the rock mixing rate is high.
Only when the inclination angle of the ore body is steep and the thickness of the ore body is large, and the conditions for recovery under the above residual are extremely favorable, a thick layer of mineral rock may be formed after multiple sections of mining, and the loss of ore loss is improved. A good indicator is obtained. Otherwise, the residual ore will soon enter the residual area of ​​the lower plate and be converted into the lower plate loss and lose ten underground. It is difficult to form a thick mixed layer of mineral rock, so that a large amount of rock is mixed every time the ore is discharged. This is the basis for the third article of the applicable conditions of the law, '
The mining strength of this method is not as great as that of a sublevel caving method. This is due to the low production capacity of the widely used loader (ZYQ-14) and the area occupied by each piece of equipment (the size of the ore body> is large. From the perspective of improving the production capacity of the ore block, the current main use is to change. The scraper is out of mine.
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