Presentation on theme: " 1. Subsurface Mining-Used for ores deeper than 150 a. Room and Pillar Mining 1. Large rooms cleared of ore 2. Pillars of coal are left to support."— Presentation transcript:
4. Placer Mining-Used for minerals laying on the surface of the earth a. Streams transport and leave minerals exposed b. Deposits along rivers and coastline are mined by a dredge c. Behind the dredge the ore is separated from the minerals and released out the back(gold and Diamonds)
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