TERTIARY COAL MEASURES OF GUNNISON COUNTY, COL. 



695 



They differ from No. 5 in that the roof is sandstone and the sha^e occurs 

 below the coal. 



A recent examination of the Cretaceous coal at Golden, Colorado, shows 

 veins varying from six to sixteen feet thick, average nine feet, standing nearly 

 vertical, a slight dip to the west, with a roof of fire-clay , affording excellent mate- 

 rial for the manufacture of fire-brick and terra cotta. 



Concerning the economic values of these Tertiary coals, I obtained the fol- 

 lowing data. Tests were from the Smith bank : 



Moisture at 105° . 1.16 



Volatile matter at red heat 4.70 



Fixed carbon 90.20 



Ash 3.94 



Specific gravity at 60° Fahrenheit 1.410, a cubic foot of coal weighing eighty- 

 eight pounds. Of five samples : 



Moisture and volatile matter was 7-346 



Fixed carbon 85.062 



Ash 7.592 



Other tests gave the lowest fixed carbon at seventy-seven per cent. Average 

 amount of sulphur is 0.403 from three separate veins. 



In calorific power the maximum amount of carbon is 80.80. 



Pennsylvania anthracite gives 



Colorado anthracite gives 



Canon City, Colorado, Cretaceous coal 



Wyoming Cretaceous coal 



Weber Canon, Utah, coals . , . . . 

 California coals 



77 



• 74 

 . 60 



•63 



■ 57 



• 55 



08 

 61 



74 

 57 

 26 



The above is a statement made, by Charles P. Williams, chemist, Philadel- 

 phia, Pa. 



Had the anthracite from the Anthracite range section been used for a com- 

 parison of calorific power, I am confident the record would have equaled the 

 best Pennsylvania anthracite, as this coal is constant in fixed carbon from ninety 

 to ninety-four and one-half per cent. 



From another source I learn that the amount of illuminating gas from these 

 Tertiary coals is seven and a quarter cubic feet per pound of coal, or 14,500 

 cubic feet per ton of 2000 pounds, not equaled anywhere as far as now known, 

 except perhaps by the Albertites of Nova Scotia. 



Of the coking coal sea,m, the following was obtained from Mr. James K. 

 Robinson, Superintendent of the Colorado Coal and Iron Company's mine. 

 Sample came from 1200 feet in, and was the latest test up to October 6, 1882 : 



Water 72 



Volatile matter 23.24 



VI— 44 



