198 



GEOLOGICAL SUEVEY OF THE TERRITOEIES. 



Asli.... 

 Siilpliur. 



6.17 



2.88 



Color of asli, light gray. Spec'iic gravity, 1.37. Weiglit per cubic 

 yard, 2,212 pounds. 



My assistant, Persifor Frazer, jr., in the United States geological sur- 

 vey of Colorado and New Mexico during the past season, has made the 

 following analyses of coals along the line of the Union Pacific railroad. 

 They were made with great care and I have the most perfect confidence 

 in their accurac}^ : 



Coal from mine at Point of Rocks : 



Per cent. 



Carbon 64.70 



Asli 4.40 



Sulphur - 0. 42 



Water and volatile substances .30. 48 



* Total 100.00 



Coal from Rock Creek : 



Per cent. 



Carbon 61.34 



Sulphur 2. 00 



Ash 1. 50 



Volatile substances and water 35. 16 



Total 100.00 



Coal from Black Buttes : 



Per cent. 



Carbon 71.64 



Sulphur 2.00 



Ash 2.50 



Volatile substances and water 23. 86 



Total 100.00 



Coal from the Evanston mine was tested for its carbon alone and found to contain 

 carbon, 72.16 per cent. All these coals resemble in their physical jaroperties those 

 met with along the route of the Colorado and New Mexico survey. 



I take the liberty of quoting- in this connection the following analj^aes 

 of coals from the admirable report* of my friend Doctor J. H, LeConte. 

 I found this report, as well as that of Doctor ISTewberry, of great service 

 to me in my explorations during the past season : 



Locality. 



Fixed 

 carbon. 



Volatile 

 material. 



"Water. 



Asli. 



1. ¥EW MEXICO 



Vermejo Canon 



Placer anthracite 



2. COLOKADO. 



Murphy's, near Denver 



Marshall's, near Denver 



Coal Creekt 



59. 72 

 88.91 



55. 31 



59.20 

 57.70 



23.73 

 3.18 



29.07 

 2C. 00 

 19.30 



3.27 

 2.90 



11.70 

 12. 00 

 20.00 



13.28 

 5.21 



3.92 



2.80 

 2.00 



* Notes on the geology of the survey for the extension of the Union Pacific Railway, eastern division, 

 from the Smokj- Hill Eiver, Kansas, to the Eio Grande, by John L. LeConte, page 58. 



t The analyses of the Marshall coal and that of Coal Creek were made by Doctor Torrey, and ero 

 copied from Doctor Haydeu's paper in Silliman's Joiirnal for March, 186S 



