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Answer :
Final answer:
Coal is typically obtained through strip mining, a common surface mining method used when coal is near the surface. Mountaintop removal and open-pit mining are other methods, but strip mining predominates for coal extraction. Approximately two-thirds of U.S. coal comes from surface mining techniques.
Explanation:
Coal Mining Methods
Coal is usually obtained through either strip mining or subsurface mining, with surface mining being the more common method. Strip mining is a type of surface mining where overburden, or the soil and rock that cover the coal, is removed in large strips. This method is often used when the coal seams are less than 200 feet below the surface.
Another closely related method is mountaintop removal, a more extreme form of surface mining where entire mountain tops are blasted to access the coal seams below. Finally, open-pit mining is another surface mining technique, but it is typically used for metal ores rather than coal.
In the U.S., roughly two-thirds of the coal mined is extracted using surface methods like strip mining, highlighting its prevalence in the extraction of coal resources.
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