Applicable conditions of the room and pillar method

(2) When the thickness of the ore body is relatively thin (<3 to 4 meters), of roof rock is solid, and the ore body is interposed in the partial lean ore or waste rock, full application method is more suitable.

(3) When the thickness of the ore body is <8-10 m, the room-column mining method of shallow hole retention and electric slag mining can be adopted.

(4) When the thickness of the ore body is large, the room-column mining method of deep-hole thin ore and trackless equipment can be used.

(Example: Pace Vegas Canada copper ore, ore average thickness of 33.5 m, open-air type trackless own equipment, ramp down the collapse trackless apparatus ore with 1.1 to 1.9 ^m3 shovel loading 18 tons, or 30 tons The truck was transported to the main slipper).

(5) in the room and pillar mining is mainly used to mine the metal deposition type iron deposit and copper, lead, zinc, bauxite, mercury and other nonferrous metals and rare metals and uranium deposits. It is also one of the main methods of mining. It is also used to mine non-metallic mineral raw materials and building materials such as rock salt, potassium and limestone .