After the preparation for the cutting and cutting work is completed, the mine mining work can be carried out.

Depending on the thickness of the ore body and the stability of the rock, there are different methods of recovery.

1) When the thickness of the ore body is between 2.5 and 3.0 meters, it is generally not to pull the bottom. It can be used for tunneling, and the whole mining is full thickness, and the thin ore is used for shallow hole retention.

2) When the thickness of the ore body is between 3 and 5 meters, it is no longer possible to use the full thickness method. It needs to be divided into two parts: bottoming and topping.

1 When the stability of the rock is good – you can pull the bottom all at once and then pick it up from the beginning.

2 When the stability of the ore is poor, the bottom should not be pulled all at once, but should be gradually pulled down, then pulled for a while and then topped, but the bottom is required to lead the top.

3 When the thickness of the ore body is in the range of 3 to 5 meters, it can be recovered. If it is thicker, it will still be difficult to use this method, mainly because the roof management is difficult. Such as:

1. If the top plate is poorly stable, it needs to be supported by bolts. If the thickness is more than 5 meters, it is very difficult.

2. It is difficult to get rid of hair, too high to see clearly, not to be able to. This work is not safe.

3) When the thickness of the ore body is between 5 and 10 meters, other measures can be taken back and forth.

For example, it is divided into several steps and taken back and forth.

1 Reverse the steps to pick up. That is, standing on the ore pile for rock drilling and shooting. In order to ventilate well, the roadway should be first drilled in the stope to make the wind flow through (when the bottom is not pulled).

2 Positive steps to pick up. If the bottom is not pulled, the ventilation roadway should be opened first. The roadway can be slanted along the inclined floor, or it can be boring along the inclined direction of the ore body in the direction of the roof. When the ore and stone slate roof clear boundaries, using a positive step better. In this way, the ore is piled up on the steps to transport the ore down, and the electric tweezers can be used. Self-equipment can also be used abroad. In addition, the recovery method is convenient for the management of the top plate, and if the stability of the top plate is poor, the anchor rod is convenient.

4) When the ore body is more than 10 meters thick, it is more common in foreign countries (such as the United States and Canada).

Due to the rapid development of trackless self-equipment in foreign countries for more than 20 years, the widespread use of tire-type and crawler-type rock drilling, loading and transporting equipment has greatly improved production efficiency.

However, China's main equipment problem has not been solved, and it is difficult to remove the pore rock powder from the outside. Therefore, it is rare to use the room-column mining method for the original ore body.

Iron ore of good mountain bolt to control the use of deep hole in the top room and pillar mining. It is not to drill down to the deep hole, but to the vertical fan-shaped hole, the mine does not pull the bottom, but cut the top. At the bottom of the mine, cut the flat roadway and rock up the mountain, and drill the vertical fan-shaped middle hole in the rock uphill. The end of the mine opens a trough as a free space for blasting and collapse.

(2) Ore transport work (ie, mining)

The ore that has collapsed can be transported by 14, 28, 30 or 55 KW.

Use the electric tweezers to pour the ore into the chute, and then put it into the stage transportation lane and pull it away. Some also directly (by means of the loading platform) into the mine car. (The foreign country also uses >55KW electric raft)

The positional relationship between the antimony ore and the transportation lane has many forms, such as the following three:

1 The transport lane is outside the vein, and the mine is loaded with the mine.

2 The lane of the transportation lane is inside the vein, and the floor of the ramp is at the same level as the roof of the roadway.

3 The level of the roadway and the mine are at the same level. (Loading a car to install a loading platform)

(3) Ventilation work

For the room and column method, there should be a special ventilation tunnel (ventilation roadway and ventilation shaft), otherwise the workers have poor working conditions.

Under normal circumstances, fresh airflow enters the mine from the roadway of the panel, and the waste wind is discharged from the windward well through the return airway.

The empty area of ​​the room and pillar method extends in all directions and must be well managed to achieve the desired ventilation effect.

It should be noted that the direction of the wind flow should be opposite to that of the antimony ore to ensure that the production workers eat less smoke.

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