COAL 



137 



Table 27. — Total estimated remaining coal resources of the United States, January 1, 1972 



of short tons. Figures are for resources in the ground, about half of which may be considered recoverable. Includes beds of bituminous 

 coal and anthracite 14 in. or more thick and beds of subbituminous coal and lignite 2V2 ft or more thick] 



Identified resources ^ 



Hypothetical resources ^ 



Overburden 0-3,000 ft 



Over- Over- Over- Over- 

 burden burden burden burden 

 0-3,000 3,000- 0-6,000 0-6,000 

 ft 6,000 ft ft 



Estimated identified resources remaining in the ground, Jan. 1, 1972 



Estimated 

 hypothe- 

 tical re- 



Anthra- 

 cite and 

 Sub- semi- 



Bitumi- bitumi- Lignite anthra- 



nous coal nous coal cite 



Source of estimate 



unmapped Estimated 

 and un- hypotbe- 

 explored tical re- 

 area^ rea- 

 sonably 

 near the 

 surface ^ 



Total 

 estimated 

 hypothe- 

 tical re- 

 sources 



Total 

 estimated 

 identified 

 and hypo- 

 thetical 

 resources 

 remain- 

 ing in 



the 



ground 



Jan. 1, 



1972 



Alabama 13,342 



Alaska 19,413 



Arizona "21,246 



Arkansas 1,638 



Colorado 62,339 



Georgia 24 



Illinois 139,124 



Indiana 34,573 



Iowa 6,509 



Kansas 18,674 



Kentucky 64.842 



Maryland 1,158 



Michigan 205 



Missouri 31,014 



Montana 2,299 



2.000 



24 



139,124 



34,573 



6,509 



18,674 

 64.842 



2,031 

 



6,824 



12,872 

 "23,721 



9.687 



6.179 



100.628 



120.656 



CulbertBon (1964); T. 



A. Simpson (written 



commun., 1972). 



Barnes (1951; 1967) 



Peirce and others 



(1970)'. 



Haley (1960) 



Landis (1959) 



Johnson (1946)' 



Simon (1966)' 



Spencer (1953) 



Landis (1965) 



Schoewe (1952; 1968)' _ 

 Huddle and others 



(1963). 



Averitt (1969) 



Cohee and others 



(1950). 



Robertson (1971)' 



Combo and others 



(1949; 1950)'. 

 Read and others (1960)_ 

 Reinemund (1949; 



1966). 



Brant (1963) 



Brant and DeLong 



(1960). 



Trumbull (1967) 



R. S. Mason (written 



commun., 1966)'. 

 Reese and Sisler (1928); 



Arndt and others 



(1968)'. 

 Toenges and others 



(1948). 

 D. M. Brown (1962) __ 

 Luther (1969; written 



commun., 1966). 

 Mapel (1967): Perkins 



and Lonsdale (1956). 

 Doelling 1970, 1971a, 



b, c, d, e, f, Doelling 



and Graham, (1970: 



1971): H. H. Doelling 



(written commun., 



1971). 

 Brown and others 



(1962). 



tid others 



26,000 



60 

 100,000 

 22,000 

 14,000 

 4,000 

 62,000 



Beikman a 



(1961). 

 Headlee 



(1940). 

 Berryhil! and others 



(1950; 1961). 



nd Nolting 



20,000 

 100 



» 10,000 



1,000 

 2,000 



14,000 



221,000 



5,000 

 30,000 



326,000 

 1,090 



100 

 16,000 



6,100 

 46,000 



426,000 

 1,000 



41,342 



14,787 

 51,179 

 100,628 

 646,666 

 1,688 



449,619 21,362 1,680,987 



1.306,280 



37,105 1,643,386 3,224,372 



'Identified resources: Specific, identified mineral deposits that may or may not be evaluated as to extent and grade, and whose contained minerals 

 may or may not be profitably recoverable with existing, technology and economic conditions. 



2 Hypothetical resources: Undiscovered mineral deposits, whether of recoverable or subeconomic grade, that are geologically predictable as exist- 

 ing in known district. ^ „, „ ^ ,l ^ 



= Estimates by H. M. Beikman (Washington), H. L. Berryhill, Jr. (Wyoming), R. A. Brant (Ohio and North Dakota), W. C. CulbCTtson 

 (Alabama), H. H. Doelling (Utah), K J. Englund (Kentuckv and Virginia), B. R. Haley (Arkansas), E. R. Landis (Colorado and Iowa), t,. I. 

 Luther (Tennessee), R. S. Mason (Oregon), C. E Robinson (Missouri), J. A. Simon (Illinois), J. V. A. Trumbull (Oklahoma), C. E. Wier (Indiana), 

 and the author for the remaining States. 



* Small resources of lignite included under subbituminous coal. 



5 Small resources of anthracite in the Bering River field believed to be too badly crushed and faulted to be economically recoverable (Barnes, 1951). 



" Includes coal in the Dakota Formation of the Black Mesa field, some of which may be of subbituminous rank. Does not include small resources of 

 thin and impure coal in the Deer Creek and Pineda'.e fields. . .t. ^.. j 



'See other summary reports on coal resources in individual States as follows: Arizona (Averitt and O'SuUivan, 1969); Georgia (Butts and 

 Gildersleeve, 1948; Sullivan, 1942); Illinois (Cady, 1962); Kansas (Abemathy and others, 1947); Missouri (Hinds, 1913; Searight, 1967); eastern 

 Montana (Averitt, 1965); Ohio (Struble and others, 1971); Oregon (Mason and Erwin, 1965; Mason, 1969); Pennsylvania anthracite (Ashley, 1945; 

 Ashmead, 1926; Rothrock, 1950); and Utah (Averitt, 1964). 



8 Small resources of lignite in beds generally less than 30 in thick. 



"From Ashley (1944). j ., , j v - ii 



■" Small resources of meta-anthracite in the Narragansett basin believed to be too graphitic and too badly crushed and faulted to be economically 

 recoverable as fuel 



" Excludes coal in beds less than 4 ft thick. 



" Includes coal in beds 14 in. or more thick, of which 14,000 million tons is in beds 4 ft or more thick. 



" California, Idaho, Nebraska, and Nevada. 



" California and Idaho. 



^ California, Idaho, Louisiana, and Mississippi. 



