

THE AMERICAN MUSEUM JOURNAL 



abundantly produced grade of coal The total production of the different 



for the industries), grades of coal in 1915— the last year 



Subbituminous (low grade soft coal), for which returns in this particular are 



Lignite (the lowest grade of coal, also available-was as follows : 

 called brown coal ). 



The differences are based chiefly on Anthracite, 89 048 500 tons valued at 



,1 ,■ -, , .in-, 1 -^ , approximately $184,750,000. 



the ratio between the fixed carbon and Bitmninous and Subbituminous and 



the volatile hydrocarbons as shown upon Lignitic coals of all grades, 442,624,- 



analysis— anthracite being very high m 435 tons, valued at $502,037,688. 

 fixed carbon and lignite very low. The 



anthracites are coals that have suffered In 1916 the production and value of 

 more elaborate inetamorphism or trans- anthracite were about the same as given 

 formation than the lower grades. Lig- above, but the production of bituminous 

 nites have been least transformed, often grades reached the enormous total of 

 preserving the woody structure of the 509,162,000 tons and was probably 

 plant accumulation from which they worth at least $600,000,000. 

 were derived. The bituminous coals The coal fields of the United States, 

 are the common steaming coals and which are literally distributed from 

 make up the bulk of coal production, coast to coast, are conveniently referred 

 but great areas of lignitic and subbitu- to under the following general names, 

 minous coals are known and constitute with grade of coal and areal extent in- 

 immense low-grade reserves. dicated for comparative purposes : 



The Coal Fiel<h of the United Sfafe.^-; 



•D A ,„n Estimated remain- 



Area in f™^"f^^ ing available re- 



^'J-'"'!- short tLT serve supply in 



snort tons 



The Anthracite Fields 480. . 88,312,000. . 16,000,000,000 



(1) Eastern Pennsylvania, Colorado, and New 



Mexico 29 . . 53,445 . . ? 



Bituminous Fields of the better grade 



(2) Atlantic Coast Triassic Fields (Va., North 



Carolina) 210 . . . . 199,000,000 



(3) Appalachian Fields (Pa., Ohio. Md., Va., 



W. Va., Ky., Tenn., Ala., and Ga.) 69,755. .357,366,000. . 530,000,000,000 



(4) Eastern Interior Fields (Ind., 111., and 



western Ky.) 47,000 . . 91,024,000 . . 318,000,000,000 



(5) Northern Interior Field (Mich.) 11,000.. 1,230,000.. 11,900,000,000 



(6) Western Interior Fields (la., Neb., Kan., 



Mo., Ark., Okla., and parts of Texas) 74,900. . 25,650,000. . 187,500,000,000 



Lignitic and Bituminous Fields (chiefly low grade 

 bituminous and lignitic coals) 



(7) Gulf Coast Lignitic Field (Ark. and Tex.) 2,100.. 1,100,000.. 20,000,000,000 



(8) Great Plains aud Eockv Mountain Fields 

 (N. Dak., S. Dak., Mont'!, Wyo., Ida., Colo., 



N. Mex., Utah) 126,022 . . 30,041,000 . . 1,969,000,000,000 



(9) Pacific Coast Fields (Wash., Ore., Cal.) . . 1,900.. 3,025,000.. 21,800,000,000 

 (10) Alaska ■. 1,210.. ? .. ? 



Groiiil Totals, sKhdiridcd on basis of (jradr 



Total original amounts: Total amount used 



Lignitic coals . . 986,855,100,000 tons to date, including 



Subbituminous allowance for 



(low grade) . . 860,331,100,000 tons waste, about . . . 15,000,000,000 tons 



Bituminous 1,314,009,300,000 tons 



Semibitumin ous 



(high grade) . 43,477,800,000 tons 



Anthracite 20,721,000,000 tons 



Balance or reserve 



3,225,394,300,000 tons supply 3,210,394,300,000 tons 



