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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 7. - Areas of resource categories from figure 19 listed in proper reliability and thickness of coal and overburden categories

[Average thickness of coal in each are can be determined by utilizing coal isopachs]

Geologic Coal thickness
14 to 28 inches 28 to 42 inches 42 to 84 inches
0 to 500 feet overburden:
Measured A, F, G, H B, E C, D
Indicated I, MM I, J, P K
Inferred CC, Y, S AA, Z W
500 to 1,000 feet overburden:
Indicated L, R, M N, Q O
Inferred U, BB V, X T
1,000 to 2,000 feet overburden:
Inferred DD, FF EE None
Hypothetical GG, JJ None Do.
2,000 to 3,000 feet overburden
Inferred LL, II HH OO
Hypothetical NN None. None
3,000 to 6,000 feet overburden
Hypothetical KK None. None
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