Tar Sands BasicsTar sands (also referred to as oil sands) are a combination of clay, sand, water, and bitumen, a heavy black viscous oil. Tar sands can be mined and processed to ...Sand Maker H

Slate WikipediaHistorical mining terminology. Before the mid-19th century, the terms slate, shale and schist were not sharply distinguished. In the context of underground coal ...Stories from S

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