Grades of Coal as per Sizes

STEAM COAL : 50 – 200 mm AND above
RUBBLE COAL : 25 – 50 mm
SLACK COAL: 0- 50 mm
R.O.M (Run - of – Mine) coal : unscreened coal of all sizes.

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  3. how will we differentiate between slack(0-50mm) and rubble coal(25-50mm)?

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