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Coal mining - Wikipedia, the free encyclopedia
The goal of coal mining is to obtain coal from the ground. Coal is valued for its energy content, and, since the 1880s, has been widely used to generate electricity ...
Coal - Wikipedia, the free encyclopedia
Hilt's law is a geological term that states that, in a small area, the deeper the coal, the higher its rank (grade). The law holds true if the thermal gradient is ...
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