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| coal seam properties | minimum | maximum | mean | variance | coefficient of variation |
|---|---|---|---|---|---|
| coal seam thickness | 0.68 m | 8.64 m | 3.40 m | 2.93 | 50.41% |
| calorific value | 22.97 MJ/kg | 32.84 MJ/kg | 29.79 MJ/kg | 4.40 | 7.04% |
| volatile content | 31.39% | 40.89% | 36.45% | 2.83 | 4.62% |
| ash content | 3.94% | 39.40% | 9.33% | 19.38 | 47.20% |
| sulfur content | 0.23% | 4.40% | 1.38% | 0.60 | 56.25% |
