480 BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



of the coal comes out fine and even the larger lumps are so shattered 

 that they will not stand handling. The coal is bituminous and 

 rather pure but is noncoking. A typical analysis of an air-dried 

 sample is as follows : 96 



Analysis of coal, Horseshoe mine, Horseshoe district 



Per cent 



Moisture 3. 6 



Volatile matter 41. 5 



Fixed carbon 52. 6 



Ash 2.3 



Sulphur -4 



Total 100-4 



Calories 7, 475 



British thermal units 13, 460 



•♦ E. G. Woodruff. U. S. Qeol. Survey, Bull. 541, pp. 379-339, 1914. 



