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Stage A height
The stage height of the natural caving method in the foreign application stage is generally 100 to 200 m. There is a gradual increase trend, and the stage height of the test nuggets in the Philippines' Felex Mine is 400m. The height of the stage is high, which can reduce the cost of excavation per ton of ore; increase the chance of impact crushing and crushing in the process of ore release, and make the ore block smaller; due to the decrease of the contact surface of the collapsed ore, if the ore is released Proper control can also reduce the depletion of ore losses; however, the maintenance costs of the mining roadway increase.
The height of the stage should be determined comprehensively based on factors such as the inclination and thickness of the ore body, the occurrence of the ore body, and the physical and mechanical properties of the ore.
B. Determination of the horizontal area of ​​a block collapse or an area collapse plan
The full continuous caving plan is not divided into mining units or mining units, and the horizontal area of ​​production is determined according to the required mine production capacity.
The determination of the horizontal area (size) of the nugget or panel scheme mainly considers the following factors:
(1) The selected horizontal area is enough to make the ore relatively easy to collapse, but it must be ensured that the roadway in the mining area is not subjected to excessive ground pressure, and the maintenance work of the roadway is small.
(2) The selected mining system and the selected drawration funnel spacing.
(3) The horizontal size of the panel caving scheme is related to the thickness of the ore body.
C bottom column height
The height of the bottom column mainly depends on the stability of the ore, as well as the selected mining system, the layout of the mining roadway, the amount of ore discharged by each funnel and the method of pulling the bottom.
D funnel spacing
The factors affecting the funnel spacing are: the height of the stage, the stability of the rock; the size of the agglomerated ore; the mining plan and the mining equipment used.
Due to the high stage height of the natural caving method, the influence of the change of the funnel spacing on the ore loss rate and depletion rate in the ore-extracting process is not as obvious as the sublevel caving method, but if the funnel spacing is large, the bottom space is effective. The ground is connected to one piece, and the required height of the bottom is also high, which will increase the cost of rock drilling and blasting. The funnel spacing is generally 5 to 15 m.