U.S. Geological Survey
National Coal Resources Data System
U.S. Coal Resource Databases
USCOAL and NEWCOAL
| Table 3. Subdivisions of the thickness, overburden, reliability, and rank database elements in USCOAL and NEWCOAL. | ||||
| Thickness - Coal Bed thickness: | Overburden - Overburden thickness (feet): | Reliability - Reliability: | ||
| Less than 14 inches | 0 to 3000 | Measured | ||
| 14 to 28 inches | 0 to 2000 | Measured and indicated | ||
| 28 to 42 inches | 0 to 1000 | Indicated | ||
| Greater than 42 inches | 1000 to 2000 | Inferred | ||
| 2.5 to 5 feet | 2000 to 3000 | Hypothetical | ||
| 5 to 10 feet | Greater than 3000 | Unclassified | ||
| Greater than 10 feet | Strippable | |||
| Classified by zone | Strippable to 1000 | |||
| Unclassified | Unclassified | |||
| Major Rank - Rank of coal: | Minor Rank - Rank of coal: | |||
| Anthracite | Low-volatile bituminous | |||
| Bituminous | Medium-volatile bituminous | |||
| Subbituminous | High-volatile bituminous | |||
| Lignite | High-volatile bituminous a | |||
| High-volatile bituminous b | ||||
| High-volatile bituminous c | ||||
| Subbituminous a | ||||
| Subbituminous b | ||||
| Subbituminous c | ||||
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Last updated 01 April 2004