Coal grading for non-coking coal is determined by the Gross Calorific Value (GCV), whereas the grading of coking coal is based on ash content. For semi-coking or weakly coking coal, the classification considers both ash and moisture content, as per the prevailing notification.
Coking Coal Grades:
- Steel Grade – II: Ash content exceeding 15% but not exceeding 18%
- Steel Grade – I: Ash content not exceeding 15%
- Washery Grade – I: Ash content exceeding 18% but not exceeding 21%
- Washery Grade – II: Ash content exceeding 21% but not exceeding 24%
- Washery Grade – III: Ash content exceeding 24% but not exceeding 28%
- Washery Grade – IV: Ash content exceeding 28% but not exceeding 35%
- Washery Grade – V: Ash content exceeding 35% but not exceeding 42%
- Washery Grade – VI: Ash content exceeding 42% but not exceeding 49%
Semi-coking and Weakly Coking Coal Grades:
- Semi Coking Grade – I: Ash + Moisture not exceeding 19%
- Semi Coking Grade – II: Ash + Moisture exceeding 19% but not exceeding 24%
Non-coking Coal Grades:
- G-1: Exceeding 7000 kcal/kg
- G-2: Exceeding 6700 and not exceeding 7000 kcal/kg
- G-3: Exceeding 6400 and not exceeding 6700 kcal/kg
- G-4: Exceeding 6100 and not exceeding 6400 kcal/kg
- G-5: Exceeding 5800 and not exceeding 6100 kcal/kg
- G-6: Exceeding 5500 and not exceeding 5800 kcal/kg
- G-7: Exceeding 5200 and not exceeding 5500 kcal/kg
- G-8: Exceeding 4900 and not exceeding 5200 kcal/kg
- G-9: Exceeding 4600 and not exceeding 4900 kcal/kg
- G-10: Exceeding 4300 and not exceeding 4600 kcal/kg
- G-11: Exceeding 4000 and not exceeding 4300 kcal/kg
- G-12: Exceeding 3700 and not exceeding 4000 kcal/kg
- G-13: Exceeding 3400 and not exceeding 3700 kcal/kg
- G-14: Exceeding 3100 and not exceeding 3400 kcal/kg
- G-15: Exceeding 2800 and not exceeding 3100 kcal/kg
- G-16: Exceeding 2500 and not exceeding 2800 kcal/kg
- G-17: Exceeding 2200 and not exceeding 2500 kcal/kg