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The room and column method is used to mine horizontal and gently inclined ore bodies, but it is more widely used than the comprehensive method. The room and pillar mining method is based on dividing the mining unit, and the mining room and the ore column are alternately arranged. The first step is to firstly mine the house. , leaving a regular continuous strip of pillars or discontinuous pillars to maintain the roof of the goaf. These pillars unless noble metal ore grade or higher, are generally not recovered, this method can not only be used to mine ore mining thinner (thickness less than 2 ~ 3m), and can be thick and very thick ore mining. The ore and surrounding rock are both stable and gently inclined ore bodies.
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