how is grading of coal done? what are the different types of coal? name the major coal producing belts of india.

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The grading of different forms of coal is done in many ways,gradation of non-cooking coal is based on Useful Heat Value (UHV), the gradation of cooking coal is based on ash content and for semi cooking / weakly cooking coal it is based on ash plus moisture content.Peat,lignite, bituminous,anthracite are some of the types of coal.

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