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four methods of mining

Mar 09, 2018· Compared to othermining methods, room-and-pillarminingis a low-costmethodwith a low recovery rate (since some ore is left behind in pillars). Yet, themethodcauses very little dilution as the contact between ore and waste is limited due to the waste being on top and ore being at the bottom. Direct operating costs for room-and-pillar

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