ENDLicn.] CATALOGUE OF COLOEADO MINEEALS COAL. 141 



Coal. — (Compare Antheacite.) Coal occurs and is worked at a num- 

 ber of localities in Colorado. Two horizons, mainly of coal beds, can 

 be distinguisbed — tbe Cretaceous and the Post- cretaceous. With the 

 exception of the anthracoid coal of the Elk Mountains and adjacent 

 regions, the Colorado coal is mostly a coMng or binding hituminous coal. 

 Some of the banks, however, furnish coal that cannot be utiHzed for 

 coking purposes. AH of this is the coal to which the term "lignite" 

 has been applied. Cretaceous coal is found on the divide between the 

 Uncompahgre and Cebolla, Elk Mountains, on the Lower Animas, the 

 Florida, and on the La Plata. Post-cretaceous coal occurs along the 

 Front Eange : near Boulder, at Golden, at Colorado Springs, at 

 CaQon, near Pueblo and Trinidad, and westward from that town. On 

 Trout Creek Pass. In the region of the White Eiver a number of 

 coal veins are found, belonging to this group. 



Four analyses of coal from the Animas region furnished the follow- 

 ing average result : 



Water 3.730 



Fixed carbon 61. 126 



Volatile combustible matter 30.677 



Ash 4.472 



Specific gravity 1. 346 



Two analyses of coal from Boulder furnished the following average 

 result : 



Water 13.305 



Fixed carbon 50. 340 



Volatile combustible matter 32. 950 



Ash 3.405 



Specific gravity 1. 270 



Eleven analyses of coal from Golden gave the following average 

 result : 



Water 12.165 



Fixedcarbon 51.989 



Volatile combustible matter 31.776 



Ash 3.900 



Specific gravity 1. 341 



Four analyses of coal frdm Colorado Springs presented the follow- 

 ing average result : 



Water 9.205 



Mixed carbon 48. 305 



Volatile combustible matter 35. 357 



Ash 7.132 



Specific gravity 1.325 



Three analyses of coal from Canyon City furnished the following, 

 average result: 



Water ...' „ 5.090 



Fixedcarbon 56.053 



Volatile combustible matter 35. 226 



Ash 3.630 



Specific gravity... 1.285 



Five analyses of coal from Trinidad gave the following average 

 result: 



Water ^ 0.792 



Fixed carbon 55. 768 



Volatile combustible matter 32. 483 



Ash 11.133 



Specific gravity 1.363 



