Empty field mining method

In the process of mining, the open field mining method divides the ore into a mine room and a pillar, a mining house and a mining column. The basic condition for applying the open field mining method is that the ore and surrounding rock are stable, and the goaf allows a larger exposed area for a certain period of time. Among the most widely used mining methods are: comprehensive mining method, room and pillar mining method, mining and mining method, phased mining method and stage mining method.

(1) Comprehensive mining law. In the ore body where the thin and medium-thick ore and surrounding rock are stable and gently inclined (the inclination is generally less than 30Â°), the comprehensive mining method is applied. Its characteristics are: the working face moves along the ore body or tends to advance in an all-round way. In the process of mining, the inclusions or lean ore in the ore body are left, and the irregular pillars are used to maintain the goaf. These pillars are generally used. Permanent loss, no recovery.

(2) House and pillar mining method. It is used to mine horizontal or inclined ore bodies. It is alternately placed in the ore and mined area mines and pillars. When returning to the mining room, continuous or intermittent regular pillars are left to maintain the top rock. It is more versatile than the comprehensive mining method, which not only recovers thin ore bodies, but also recovers thick and extremely thick ore bodies. Both the ore and surrounding rock are stable horizontal and gently inclined ore bodies are the basic conditions for the application of this mining method.

(3) Mining and mining law. The workers directly work on the remaining ore piles under the exposed surface of the mine, and stratify and recover from the bottom up. Each time the ore collected is replayed by about 1/3, and the rest is temporarily retained in the mine as work to continue mining. station. After all the mining houses have been harvested, the ore that has been retained in the mining room will be released in large quantities, that is, a large amount of ore is released. This mining method is suitable for mining steep ore deposits where the ore and surrounding rock are stable, the ore is not self-igniting, and it is easy to agglomerate after breaking.

(4) Staged mining method. According to the vertical direction of the ore block, it is divided into several sections, and the mine room and the pillar are arranged horizontally in each section, and the ore collected in the middle section is respectively transported out from the outflow roadway of each section. After the mining of the section mining mine is completed, the pillars of this section can be immediately recovered and the goaf can be treated at the same time.

(5) Stage mining method. The open-field mining method using deep-hole back mining houses can be divided into horizontal deep-hole stage mining method and vertical deep-hole stage mining method according to different mining methods. The former requires a bottoming at the bottom of the mine. In addition to pulling the bottom, the latter also needs to open a vertical cutting slot at the full height of the mine.

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