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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 6. - Areas of resource categories from figure 17 listed in proper reliability and thickness of coal and overburden categories

[Tonnage estimate for each area could be determined (1) by planimetering each area for acreage, and (2) by multiplying acreage by proper weight of coal per acre-inch by the average thickness of coal in the area. Thickness of coal for each area is obtained by referring to coal thickness isopach.]

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

  0 to 500 feet overburden:    
Measured A, G, H B, F C
Indicated I, N E, J, L, M K
Inferred O, R P, Q None
       
  500 to 1,000 feet overburden:    
Indicated S, V T, D, U None
Inferred W, Y X Do.
       
  1,000 to 2,000 feet overburden:
Inferred Z AA None
Hypothetical DD None Do.
   
  2,000 to 3,000 feet overburden
Inferred BB None None
Hypothetical CC Do. Do.
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