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anticline Atlantic City bed at location bed of lignite brown carbonaceous Castle Valley Cave Hills chalcopyrite clay coal beds contains copper Cretaceous cross-bedded deposits dike district drilled east Emery exposures feet thick foot Fork of Grand fossils Fox Hills sandstone gas field gas sand Geol geologic gold Grand River granite gray Gumbo Harding County inches at location inches of coal inches thick Lance formation Laramie Laramie Mountains lignite bed Limestone lode lower Ludlow lignitic member Ludlow member miles mining northeast northwest occur outcrop overlain Perkins County Petrolia places Plate probably prospecting pyrrhotite quartz region Rock Creek sandy shale schists Section of lignite shaft shown Slim Buttes soft South Dakota South Fork South Pass City southeast southwest strata structure surface thin beds tion Total lignite Total section township underlain Union formation upper vein vicinity weathered White River formation
Page 30 - They occupy a rocky mound about half a mile long and a quarter of a mile wide, having an elevation of 50 or 60 feet above the adjacent valley.
Page 83 - Analysis C represents the theoretical condition of the coal after all the moisture has been eliminated. Analysis D represents the coal after all moisture and ash have been theoretically removed. This is supposed to represent the true coal substance free from the most important impurities.
Page 81 - ... the floor so as to catch the particles of coal as they are cut and to keep out impurities and excessive moisture where the floor is wet. Such a cloth should be about 1 J by 2 yards in size and spread so as to catch all the material composing the sample.
Page 41 - Calories" the values are given to the nearest five units, and in the column headed "British thermal units...
Page 81 - British thermal unit is the amount of heat required to raise the temperature of 1 pound of water 1° F.
Page 83 - In the analytical work chemists generally recognize that it is not possible to determine the proximate conditions of coal or lignite with the same degree of accuracy as the ultimate constituents. Therefore the air-drying loss, moisture, volatile matter, fixed carbon, and ash are given to one decimal place only, whereas the ash (in an ultimate anaylsis), sulphur, hydrogen, carbon, nitrogen, and oxygen are given to two decimal places.
Page 57 - The district may be regarded as comprising an area measuring about 15 miles from east to west and 12 miles from north to south, the northern half lying in Converse County and the southern half in the northeast corner of Albany County.
Page 40 - This form is not well suited for comparative purposes, for the amount of moisture in the sample as it comes from the mine is largely a matter of accident, and consequently analyses of the same coal expressed in this form may vary widely.
Page 168 - Notes Explanatory of a Map and Section Illustrating the Geological Structure of the Country Bordering on the Missouri River, from the Mouth of the Platte River to Fort Benton.
Page 83 - This form is not well suited for comparisons, for the amount of moisture in the sample as it comes from the mine is largely a matter of accident and consequently analyses of the same coal expressed in this form may vary widely. Analysis B represents the sample after it has been dried at a temperature a little above the normal until its weight becomes constant.