Geology of the Lewistown Coal Field, Montana |
Common terms and phrases
alcohol engine amount approximately average beak Big Snowy Mountains bituminous brake horsepower British thermal units BULLETIN Carboniferous carburetor cent close coal fields coke Colo coloradensis Colorado compression pressure contain crotalum cylinder degree of compression denatured alcohol deposits Devonian dome dorsal valve estimated exhaustion feet figs Figure formation fossils fuel bed fuel consumption fuel needle-valve fuel-consumption rate gas producer gasoline and alcohol gasoline engine Geological Survey Girty horsepower per hour ignition increase iron Kootenai Lewistown field Long tons lower maximum load minimum mining mixture quality Moccasin Mountains Mount Eolus Naticopsis obtained operating original supply Ouray limestone outcrop peat petroleum Plate plications Productella quantity region rocks Rockwood sandstone series of tests shale shell short tons sinus species specimens Spirifer square miles striæ surface temperature thermal efficiency thickness tion travertine U. S. Geol ventral valve waste workable coal
Popular passages
Page 14 - BULLETIN 332. Report of the United States fuel-testing plant at St. Louis, Mo., January 1, 1906, to June 30, 1907; JA Holmes, in charge. 1908. 299 pp. BULLETIN 334. The burning of coal without smoke in boiler plants; a preliminary report, by DT Randall.
Page 141 - In 1859 Professor Shepard and Col. LM Hatch suggested the utilization of phosphatic marls in the manufacture of commercial fertilizers, and started a factory at or near Charleston which was, however, soon abandoned. Remains of their compost heap were utilized by neighboring farmers with good effect long after the war.
Page 13 - Experimental work conducted in the chemical laboratory of the United States fuel-testing plant at St. Louis, Mo., January 1, 1905, to July 31, 1906, by NW Lord.
Page 120 - ... River deposits are likewise as yet in the prospect stage, but may in time develop into an important copper-mining district. The most promising property is at present the Bonanza mine, a large body of high-grade chalcocite ore. No data are as yet available as to its continuation in depth. TENNESSEE, At Ducktown, Tenn., the Tennessee Copper Company and the Ducktown Sulphur, Copper, and Iron Company are producing an aggregate amount of 18,000,000 to 20,000,000 pounds of copper per annum.
Page 24 - So far as underground workings are concerned, there has been no revolution in the methods employed since that time, but there has been a considerable improvement in the application of those methods, which has resulted in the recovery at the present time of a materially larger proportion of the coal in the ground than was the rule at that date. The earlier methods of mining consisted in leaving comparatively narrow pillars, and in the mining of large rooms the result was that the pillars were not...
Page 23 - ... have been of inferior quality, only the high-grade coal has been mined and the poorer material left. The coal left as pillars, or as portions of the roof, may be considered a necessary loss, but that which is left because of its inferior quality cannot be considered unavoidable waste in any sense, and is frequently of higher grade than coals mined and used in other portions of the country. Enormous quantities of coal have been lost beyond recovery from the mining of beds lying below, the caving...
Page 23 - Again, as soon as the end appears in sight prices will rise and production diminish, and that progressively. This interference with the law of decreasing increase produced by growing scarcity will, of course, prolong the life of our o»al reserves, but at the same time will greatly hamper our industries dependent on this fuel.
Page 145 - There are in the series several other beds ranging from a few inches to 10 feet in thickness, and separated by thin beds of limestone or shale. Usually one and sometimes two of these beds at a given section are workable, and probably some of the others will eventually be mined. The lime phosphate content in the workable beds varies from 65 to 80 per cent, with an average of 72 per cent.
Page 20 - The first mining of coal in a commercial way, in the United States, was in what is known as the Richmond basin, a small area in the eastern part of Virginia. Small quantities of coal had been mined here in the latter part of the eighteenth century and it was also in the latter part of the eighteenth and the beginning of the nineteenth centuries that efforts were being made to introduce anthracite coal for fuel purposes.