Mineral and allied resources of Albany County, Wyo. and vicinity

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The Laramie republican company, 1906 - Technology & Engineering - 79 pages
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Page 71 - Figure 7.) The Red Buttes gypsum is in the same formation and the gypsum outcrop may be found at a number of places along the eastern side of the Laramie Plains within a half mile of the limestone and sandstone exposures which form the western slope of the Laramie Mountains. The sand and lime have washed down from these exposures and are mixed with disintegrated gypsum and deposited in depressions of the plains forming numerous beds of gypsum earth. The Laramie secondary gypsum has an average depth...
Page 71 - Gypsite, or the material from which cement plaster is made, contains beside the gypsum some 20 per cent of other material, such as clay, sand and limestone. The composition of the different products on the market is very variable and cannot be supposed to be alike in their value and use, but what difference a greater or less amount of lime or silica or magnesia has on the working of the plaster has not been determined. The action of these substances as a whole is to retard the time of setting and...
Page 74 - This county has no large mines. For years there has been a small amount dug for local consumption. In fact, what was probably the first mine in the state was opened by the Denver and Salt Lake Stage Company in 1865, near where the old Overland Trail crosses Rock Creek. The coal was used for blacksmithing, and was carried to other points on the trial for this purpose.
Page 74 - The coal was used for blacksmithing, and was carried to other points on the trial for this purpose. But a small portion of the county is underlain by Laramie rock. The most southern point at which coal has been found is on the hills to the north of Centennial Valley. Here coal of inferior quality has been dug at various times, but the coal strata are so bent and crushed, and are tilted so against the mountains thta the coal is much broken and slacked.
Page 65 - ... having been at the rate of $23.74 per ton. There were raised from the mine, between January 1st, 1865 and January 1st, 1868, 10,222 tons of ore, which gave a bullion product of $207,949.66, making an average yield of $20.34 to the ton, of all the ore taken from the mine since it was first opened. A shaft has been sunk on the ledge to a depth of four hundred and twenty feet, at which point it varies from one to four feet in thickness, the average thickness being about three feet. "Within the past...
Page 74 - Brook coal was cut at 300 feet. One six-foot and one three-foot vein were passed through, but so far as known no samples of it were saved, so that nothing is known regarding its quality. Coal is being dug for local use among the ranchmen in Coal...
Page 74 - ... as much as a bushel of water. A block of the cement plaster after it is set and dry, containing 50 parts sand per 100 parts of plaster, has a specific gravity of 1.5 compared with water. A cubic foot weighs 93.5 pounds.
Page 75 - ... up at different points nearly as far down as the Diamond ranch house, but it will not be in large, continuous bodies, owing to the faulting. This coal is of the Laramie age. At a point a mile south of Rock River the railroad cut shows a thin seam of coal in older rock. At one time a slope...
Page 71 - From a few inches below the surface to about seven feet it is pure gypsite powder, then comes a red layer of five inches, and below this a foot or more of the white gypsite powder resting on gravel and red clay. The plaster material is as fine as flour, requiring no grinding or even •Compiled from a bulletin by Profs.
Page 17 - ... but the majority of the gold is in shape of finer particles varying from the fine or flour gold up to flat nuggets an eighth of an inch long.

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