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Some geophysical methods, , [In method column: A, airborne surveys; B, , tailings and extent of acid mine drainage around mineral deposits .
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Examples chosen illustrate types of mining practices as of , some of the more common mining terms are defined in the following , mining methods are used today
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What is clean coal technology? by Sarah Dowdey NEXT PAGE NEXT A coal-fired power plant in , Some clean coal technologies purify the coal before it burns
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