Coal Reserves of the Matewan
Quadrangle, Kentucky -A Coal Recoverability Study

U.S. Bureau of Mines Circular 9355

Table 1.-Coal resource definition differences-KGS-USGS coal availability program and USBM coal recoverability program

Criterion	KGS-USGS	USBM
Tonnage inclusion	Coal-only	Coal plus partings (total seam).
Minimum mining thickness, in:
Surface minable	14 (coal-only)	12 (coal plus partings).
Underground minable	28 (coal-only)	24 (coal plus partings).
Minimum mining cover (UG)	NAp	100 ft.
Maximum mining cover (UG)	1,000 ft	NAp.
Maximum mining highwall	200 ft	20:1 ratio.

NAp Not applicable.

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