Coal Resource Classification System of the U.S. Geological Survey
By Gordon H. Wood, Jr., Thomas M. Kehn, M. Devereux Carter, and William C. Culbertson
GEOLOGICAL SURVEY CIRCULAR 891
Table 2. - Average specific gravity and average weight of unbroken coal per unit of volume of different ranks
Weight of unbroken coal per unit volume |
||||||||
| Rank | Specific gravity |
Short tons per acre-foot |
Short tons per acre-inch |
Metric tons per acre-foot |
Short tons per square mile-foot |
Metric tons per square mile-foot |
Metric tons per square hectometer-meter |
Metric tons per square hectometermeter |
| Anthracite
and semianthracite |
1.47 | 2,000 | 166.6 | 1,814 | 1,280,00\0 | 1,160,960 | 14,700 | 1,470,000 |
| Bituminous coal | 1.32 | 1,800 | 150 | 1,633 | 1,152,000 | 1,045,120 | 13,200 | 1,320,000 |
| Subbituminous coal | 1.30 | 1,770 | 147.5 | 1,605 | 1,132,800 | 1,027,200 | 13,000 | 1,300,000 |
| Lignite | 1.29 | 1,750 | 145.8 | 1,588 | 1,120,000 | 1,016,320 | 12,900 | 1,290,000 |
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