COAL -- A Fossil Fuel How Coal Was Formed How We Get Coal ... Surface mining can be used when the coal is buried less than 200 feet underground. In surface mining, ...
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Allocate each 'Home Group' member a different type of mining. ... Underground mining is used when an ore body is ... One efficient way of mining coal underground ...
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ROCK SALT MINING Executive summary on ... much like one would mine coal or iron ore. Dry mining is only practiced in the Detroit area. ... (or at least used to come) ...