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The two-step process in coalmining involves: Preliminary Treatments: This includes placer and underground mining. Mechanical Miners: This includes longwall and pillar extraction.
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While the mechanical miners are based on the development of wedges mined in front of the face, longwall mechanizing is based on mining the rock utilized by wedges. Two primary methods of mining coal in situ are known as longwall mining and face mining. d2c66b5586