GEOLOGICAL SUEVEY OF THE TERRITORIES. 



321 



and ranges from this to twenty or thirty per cent., very rarely exceeding 

 forty per cent. The composition of the American varieties, so far as 

 found by the writer, is contained in the following table, which also gives 

 the localities of the principal mines worked and the thickness of the beds. 

 The water was determined by drying the coarsely-pulverized coal in an 

 oil bath below the temperature of boiling oil and above that of boiling 

 water, continuing the drying for several hours till the coal ceased to 

 lose weight. The fixed carbon in all these analyses is uncertain in 

 quantity, as its amount varies through a few per cent, according to the 

 greater or less heat employed in expelling the volatile matters. 



ANALYSES OF COALS FROM THE ROCKY MOUNTAINS. 



Locality. 



Golden City, C. T., 56 feet 



below surface. 

 Golden City, C. T.. north end 



of 100 feet level. 



Do 



Golden City. C. T., south end 



of 100 feet level. 

 Murphy's, Ralston Creek, C. T. 



Do 



Do 



Marshall's, Boulder Co., C T 

 Briggs's, Boulder Co., C. T. . 

 Baker's, Boulder Co., C. T . . 



Carbon, W. T 



Hallville, W. T., upper bed 



Hallville, W. T., lower bed . 



Van Dyke, W. T 



Rock Springs, W. T 



Evanston, IT. T 



Crissman's, Coalville, U. T 

 Monte Diablo, Cal 



«d 



110 S. 



105 S. 



96 S-. 



84 S.. 

 86 S.. 



140 W. 



282 W. 



313 W. 

 315 W 

 442 W 

 480 W. 



6 to 10 

 6 to 10 



6 to 10 

 6 to 10 



14 to 16 



10 

 13 



41 



7 

 6 



1.32 

 1.354 



1.33 

 1.27 

 1.32 



1.33 



1.32 



1.32 

 1.27 

 1.29 

 1.30 

 1.32 



13.43 



13.67 



13.10 

 12. 70 



13.83 

 13.70 

 13.90 

 12.00 

 14. 80 

 15.00 



6.80 



12.12 



13.26 



8.12 

 7.00 

 8.58 

 10.66 

 3.28 



3.85 



4.00 



3.70 

 4.10 



5.85 

 5.80 

 4.30 

 5.20 

 3.40 

 3.85 



8.00 



3.76 



4.87 

 2.00 

 1.73 

 6.30 

 3.11 

 4.71 



37.15 

 34.75 



35.88 



33.08 

 34.50 

 30.50 



35.48 



29.75 



29.46 

 36.65 

 36.81 

 35.22 

 38. 23 

 47. 05 



45.57 

 47.58 



49. 72 

 47.30 

 50.65 



54.37 



52.41 

 53.23 

 54.46 

 49.90 

 48.00 

 44.90 



Description. 



Gray ash. 



Orange-colored ash. 



Gray ash ; light, bulky, 



Orange-colored ash. 



Olive" brown ash ; coal 

 hard and tough. 



Light-gray ash ; nearly 

 white. 



Gray ash ; smoke whit- 

 ish. 



Yellowish-gray ash. 



? Light-gray ash ; these 



3 coals make coke. 



By W. P. Blake, Janu- 

 ary, 1867. 



Texture frequently very apparent ; specific gravity about 1.2. At the 

 temperature of boiling water they commonly lose about 3 per cent. In the 

 analyses given the water thus obtained goes with the volatile matters in 

 the second column. They do not generally melt by heat, but some of 

 them soften sufficiently for the particles to adhere together, and some 

 become fluid-like oils, at a moderate elevation of temperature. These 

 last seem to belong altogether to fresh-water limestone formations, and 

 to be nearly related to the petroleum found in the same formations. 



Locality. 



Utweiler, right bank of the Rhine 



Germany 



Edon, Charente 



St. Lon, Lower Pyrenees 



Enfant Dort, mouths of the Rhone. 

 Minerve L' Aude 



Dauphin, Lower Alps 



Description. 



Water, 5 per cent. ; compact, black, shining, 



specific gravity, 1.208. 

 Dull, brownish black ; powder, same ; compact, 



ash-brick color. 

 Shining black ; contains resin ; compact, with 



thin, jet-like layers. 

 Dull black*; fracture, smooth and dull. 

 Black, with irregular, shining fracture. 

 Compact; brilliant black color ; irregular frao 



ture ; powder, brownish black ; yields coke. 

 Compact ; black, greasy luster ; powder, clear 



brown ; used by blacksmiths. 



21 G 



