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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 5. - Areas of reliability from figure 15 listed in proper overburden and coal thickness categories

Geologic
assurance
category
Coal thickness
14 to 28 inches 28 to 42 inches 42 to 84 inches

  0 to 500 feet overburden:
Measured A, D, E B, Q C, R
Indicated J, K, L I, H G, D
Inferred O N M
       
  500 to 1,000 feet overburden:
Indicated P None None
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