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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 2. - Average specific gravity and average weight of unbroken coal per unit of volume of different ranks

   

Weight of unbroken coal per unit volume

Rank

Specific gravity

Short tons per

acre-foot

Short tons per

acre-inch

Metric tons per

acre-foot

Short tons per square mile-foot

Metric tons per square mile-foot

Metric tons per square hectometer-meter

Metric tons per square hectometermeter

                 
                 
Anthracite and

semianthracite

1.47 2,000 166.6 1,814 1,280,00\0 1,160,960 14,700 1,470,000
Bituminous coal 1.32 1,800 150 1,633 1,152,000 1,045,120 13,200 1,320,000
Subbituminous coal 1.30 1,770 147.5 1,605 1,132,800 1,027,200 13,000 1,300,000
Lignite 1.29 1,750 145.8 1,588 1,120,000 1,016,320 12,900 1,290,000
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