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hard coal
Description Coals with a gross calorific value (moist, ash-free basis) which is not less than 24 MJ/kg or which is less than 24 MJ/kg provided that the coal has a vitrinite mean random reflectance greater than or equal to 0.6 per cent. Hard coal comprises anthracite and bituminous coals and excludes lignite and sub-bituminous coals (15).
Source United Nations, International Recommendations for Energy Statistics. Statistical Papers, Series M, No. 93 (United Nations publication, Sales No. E.14.XVII.11).
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