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100 per cent aromatic ash content ash level ash penalty Assam Assam coals Bhilai Bhilai Steel Plant Bhojudih blend containing boiler borehole brown coal caking calorific value carbon cent ash cent Churcha coal CFRI chemical classes of coals classification coal research coal substance Coal Survey Laboratory coalfield code number coke type coking coals coking property coking tests colliery combustion cost Dishergarh Dr Lahiri Dugda I coal exinite factors fly ash given in Table graded heat units heat values High volatile hydroaromatic hydrogen increase Indian coals inertinite Jharia Kargali kcal/kg lignite Low volatile mesh mesh mesh metallurgical coke mineral matter mining parameter petrographic phosphorus pilot plant present price structure production properties of coals pyrolysis Ramgarh Ranchi Raniganj rank coals rank of coal Raw Churcha samples stamp charging steam Sudamdih sulphur techniques tonnes Valley C.F. values of coals vitrinite volatile coals volatile matter Washed coal washery West Bokaro yield