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Health and environmental impact of the coal industry - Wikipedia
Coal mining - Citizendium
Surface mining
What are the differences between alluvial mining and open pit
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Surface Mining, de.wikipedia.org/wiki/Tagebau_Hambach en.wi…
Mining - Wikipedia
coal was surface mined from five sites labeled 1 through 5 that
Surface Mining Control and Reclamation Act of 1977 - Wikipedia
Surface mining - Wikipedia