Stage mining method evaluation

The 1st stage mining method requires that the ore and surrounding rock be stable, especially the surrounding rock should have sufficient stability so that it cannot be produced during mining.

2 The ore body is required to be relatively regular.

3 Requirements are steeply inclined, thick ore bodies.

4 Applicable to mining bodies with low mining value.

(2) Main advantages:

1 The production capacity of the ore block is high, and some mines can reach 300-400 tons/day;

2 Labor productivity is high, and the productivity of rock drillers can reach 25~33m3/I;

3 pit wood consumption is small; (0.0020.0005 m3/piece)

4 Safety at the time of recovery;

5 Good ventilation and good sanitary conditions;

6 Mining costs are low.

(3) Main disadvantages:

1 The ore column accounts for a relatively large amount of minerals (up to 35-60%) and returns to the mining column. The ore loss and depletion are relatively large. If the large blasting method is used to return to the mining column, the ore loss can reach 40-60%.

2 The bulk rate is relatively high, reaching 20-30%. (Some reach about 35%). This increases the amount of secondary crushing work, as well as increases consumption and deteriorates mining conditions.

3 Through production practice, it is proved that mining in this way is more serious. Because the upper plate is free and full during the blasting, and the breaking freedom of the lower plate is not sufficient, each blasting leaves a piece, and the more it stays.

â–³ (If the arrangement of the rock well is unreasonable, the patio should be opened along the lower contact line.

(4) It needs to be resolved and the direction of development.

1 According to the deposit conditions, the components of the ore block should be correctly selected, the proportion of the mines should be increased as much as possible, and the ore content should be reduced. And improve the mining process of the pillar, reducing the loss of depletion.

2 In order to prevent the mining of the lower plate, it is necessary to dig into the patio along the contact line of the lower plate and control the scope of the collapse during rock drilling. (If placed on the upper plate, the bottom of the hole is facing the lower plate, and the hole bottom distance is large, the explosive distribution is uneven, the blasting efficiency is not good, and it is free and insufficient, so the mine is lost.

3 Reasonable selection of demineralization parameters to reduce large blocks.

4 Improve rock drilling tools and equipment. Solve the upper level roadway tunneling mechanization. In particular, the tunneling and rock drilling chambers are difficult to excavate and mine, and the physical labor is heavy. It should be improved.

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