(1) Empty field mining method. It is characterized in that during the mining process, the goaf is mainly supported by the retained or permanently retained pillars, and the goaf is always empty. Generally used when the ore and surrounding rock are very stable.
(2) Caving mining method. It is characterized in that, with the mining of ore, it is planned to fill the goaf with the cover rock and the upper and lower rock of the collapsed ore body, and timely control the ground pressure of the goaf and the treatment of the goaf. It is generally used under the condition that the surrounding rock of the ore body is unstable and the surface is allowed to fall.
(3) Mining and mining law. It is characterized in that during the mining process, some ore collected in the goaf is temporarily retained, so as to support the pillar to support the goaf. Generally, the ore is relatively stable, and it is not easy to be oxidized, bonded and spontaneously burned, and the ore body surrounding rock is moderately stable.
(4) Filling mining method. The utility model is characterized in that, in the mining, the goaf supports the goaf by means of the artificial support body formed by filling the filler, the pillar or the filler and the filler. It is mainly used for ore bodies with high value of mining ore, high recovery rate, convenient filling materials, no surface subsidence and special complex geological conditions.
Mechanical jack
Mechanical jack is also known screw jack and can be used upside down. The mechanical jack widely used for maintenance of railway vehicles, bridge installation, mining, construction support, and lifting of vehicles and equipment, has the advantage of simple structure, easy to use, safe and reliable, mechanical jack which is a widely used lifting tool.
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