The coal is moderately hard, burns well, seems to stand exposure to the air, and as a domestic coal is highly satisfactory. To the unaided eye the coal is free from pyrite, but under a lens small irregular particles are visible. The area of the field... Information Circular - Page 471971Full view - About this book
| Geology, Economic - 1909 - 504 pages
...Nos. 49 to 55, inclusive, PI. XI, and an analysis of coal from the first bed is given on page 217. The coal is moderately hard, burns well, seems to...satisfactory. To the unaided eye the coal is free from pj^rite, but under a lens small irregular particles are visible. The area of the field is not great,... | |
| Geological Survey (U.S.) - Geology - 1909 - 504 pages
...Creek, Mont., and the lower coal is similar to that at Bridger. To the unaided eye the coal appears free from pyrite, but under a lens small irregular particles are visible. CHEMICAL PROPERTIES. The composition of the coal is shown in the accompanying table. Samples for analysis... | |
| United States - 1909 - 520 pages
...Creek, Mont., and the lower coal is similar to that at Bridger. To the unaided eye the coal appears free from pyrite, but under a lens small irregular particles are visible. CHEMICAL PROPERTIES. The composition of the coal is shown in the accompanying table. Samples for analysis... | |
| United States. Bureau of Mines - Mines and mineral resources - 1913 - 1226 pages
...district had been extensively prospected but was wholly undeveloped owing to inaccessibility to market. The coal is moderately hard, burns well, seems to...stand exposure to the air, and as a domestic coal is satisfactory. For chemical analyses of this coal see part I of this bulletin, p. 296; also US Geol.... | |
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