room and pillar mining in chrome

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        • Platinum-Group Metals Overview The Extractive

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        • Chapter 2: The Environmental Effects of Strip Mining

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            • Chapter 2: The Environmental Effects of Strip Mining

              EFFECTS OF. STRIP MINING ... operators used a room-and-pillar method whereby large pillars of coal were left in place to hold up the roof and protect the miners.

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              THE OPTIMIZATION OF MINING METHOD AND EQUIPMENT 111 Introduction The purpose of this paper is to explore the integration of technology and stoping systems.

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