| Anthracite or semianthracite - Resource potential less certain |
| Anthracite or semianthracite beds of mineable thickness - Minimum 14 in. |
| Bituminous coal - Resource potential less certain |
| Bituminous coal beds of mineable thickness - Minimum 14 in. |
| Lignite - Resource potential less certain |
| Lignite beds of mineable thickness - Minimum 30 in. |
| Lignite underlain by subbituminous coal - Resource potential undefined |
| No rank has been assigned |
| Subbituminous coal - Resource potential less certain |
| Subbituminous coal beds of mineable thickness - Minimum 30 in. |
| Subbituminous coal underlain by bituminous coal - Resource potential undefined |
