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Вот нашла классификацию, что-нибудь подходит для Кор? Anthracite is the hardest and most energy valuable rank of coal.
Bituminous is the second rank of coal and accounts for half of the coal production in Canada. It is the primary type of coal that is used in making steel and for thermal electricity generation.
Sub-bituminous is the third rank of coal and accounts for about a third of Canada's coal production. It is used for thermal electricity generation.
Lignite, the final rank of coal, has the lowest energy value and is also used for thermal electricity generation.
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