A Practical Treatise on Hydraulic Mining in California: With Description of the Use and Construction of Ditches, Flumes, Wrought-iron Pipes, and Dams; Flow of Water on Heavy Grades, and Its Applicability, Under High Pressure, to MiningD. Van Nostrand, 1898 - 307 strani |
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Zadetki 1–5 od 31
Stran 11
... . Distribution of Gold in the French Table 35. Distribution of Gold in the North Mine Sluices . Mine Sluices . Corral Sluices . Bloomfield Sluices , 252 Loss of Quicksilver . CHAPTER XVIII . LOSS OF GOLD CONTENTS . II.
... . Distribution of Gold in the French Table 35. Distribution of Gold in the North Mine Sluices . Mine Sluices . Corral Sluices . Bloomfield Sluices , 252 Loss of Quicksilver . CHAPTER XVIII . LOSS OF GOLD CONTENTS . II.
Stran 12
... Loss of Quicksilver . CHAPTER XVIII . LOSS OF GOLD AND QUICKSILVER . La Grange . North Bloomfield . Table 36 . Loss of Quicksilver and Yield of Bullion at North Bloomfield . Delaney and New Kelly Claims . Table 37. Run at the De- laney ...
... Loss of Quicksilver . CHAPTER XVIII . LOSS OF GOLD AND QUICKSILVER . La Grange . North Bloomfield . Table 36 . Loss of Quicksilver and Yield of Bullion at North Bloomfield . Delaney and New Kelly Claims . Table 37. Run at the De- laney ...
Stran 52
... loss to those who had been attracted thither by the desire of gain . In 1859-60 came the exodus to the Comstock , and in 1862 the rush to Idaho followed . Hydraulic mining gained ground steadily from 1852 to 1865. As the river bars and ...
... loss to those who had been attracted thither by the desire of gain . In 1859-60 came the exodus to the Comstock , and in 1862 the rush to Idaho followed . Hydraulic mining gained ground steadily from 1852 to 1865. As the river bars and ...
Stran 81
... losses in many instances were very large , but in other cases the gains obtained in a short time were so enormous as to throw around this class of work a fascination which induced many to engage in it . To obviate the necessity of ...
... losses in many instances were very large , but in other cases the gains obtained in a short time were so enormous as to throw around this class of work a fascination which induced many to engage in it . To obviate the necessity of ...
Stran 92
... loss from absorption . Steep and denuded slopes are always the best , as but little water will escape . The greatest ... losses due to absorption and evaporation are reduced to a minimum where the site of a reservoir is in a compact ...
... loss from absorption . Steep and denuded slopes are always the best , as but little water will escape . The greatest ... losses due to absorption and evaporation are reduced to a minimum where the site of a reservoir is in a compact ...
Pogosti izrazi in povedi
alluvial alluvions amount auriferous banks bed-rock bottom bucket Butte County California cañons cement channel claim Coast Ranges construction cost Creek cubic feet cubic yards deposits depth discharge district ditch drift Eureka Lake feet deep feet high feet long feet per mile feet per second feet wide flume foot French Corral gold gold-fields gold-washing grade Grange granite gravel head height Hill hundred feet Hurdy-gurdy hydraulic mining inches in diameter iron La Grange length lower material Milton miner's inches miners miocene mountain Nevada County North Bloomfield nozzle obtained one-half Pelton PELTON WHEEL pipe placed plank pliocene precious metal pressure box quantity quartz quicksilver reservoir riffles River rivets rocks sand seams shaft side Sierra Nevada sills slates slope sluices Smartsville South square stone streams thick thousand feet timber tion top gravel Total tunnel undercurrents velocity washed width yield Yuba
Priljubljeni odlomki
Stran 126 - Bloomfield inch can only be considered an assumed rough estimate of discharge in twenty-four hours for one miner's inch. The theoretical velocity, in feet per second, of a fluid flowing into the air, through openings in the bottoms or sides of a vessel or reservoir, the surface level of which is kept constantly at the same height, is equal to that which a heavy body would acquire in falling through a space equal to the depth of the opening below the surface of the fluid, and is expressed as follows...
Stran 3 - ME A Practical Treatise on Hydraulic Mining in California. With Description of the Use and Construction of Ditches, Flumes, Wrought-iron Pipes and Dams; Flow of Water on Heavy Grades, and its Applicability, under High Pressure, to Mining.
Stran 225 - The cross riffle which they make is not excelled by any other form. 2d. Their cheapness under ordinary conditions of timber supply. 3d. The convenience of cleaning up, which can be quickly and cheaply done. This last circumstance is of especial importance, because it is often desirable to collect the gold at frequent intervals, as it is injudicious to expose amalgam collected in the riffles to wear by the gravel running over it for long periods. Experience shows square block riffles to be the best...
Stran 112 - ... tons. It is believed that the structure is sufficiently stable to allow with safety a flood of 16,000 cubic feet of water per second to pass through the wastes and over its crest. The water passing over the dam will fall on bare granite bedrock, and thence flows down a steep gorge.
Stran 226 - ... is washed these are considered preferable on account of their cheapness. At Smartsville they have been found to serve fully as well as the blocks, and are claimed to be cheaper. It must, however, be stated that they are more costly to handle, as longer time is required to clean up and repave the sluices when they are used. In some sections of the State longitudinal riffles are preferred, ie, riffles made of scantling placed lengthwise in the sluice.
Stran 109 - This culvert is built with heavy dry-rubble foundation and walls, and is covered with granite slabs sixteen to eighteen inches thick and six and one-third feet long. Three wrought-iron pipes of No. 12 iron, each eighteen inches in diameter, pass through the water-face of the dam. Their upper mouths are protected by a strainer, formed of two-inch plank, anchored to the bed-rock. A separate valve or gate is placed at the lower end of each pipe ; the water passing through the gates, aggregating a flow...
Stran 45 - There is no doubt but that gold, silver, quicksilver, copper, lead, sulphur and coal mines, are to be found all over California, and it is equally doubtful whether, under their present owners, they will ever be worked.
Stran 124 - ... miner's inch of the Park Canal and Mining Company, in El Dorado County, discharges 1.39* cubic feet of water per minute. The inch of the South Yuba Canal Company...
Stran 54 - ... Slope, the Sierra, the Great California Valley, and the Coast Ranges. This arrangement of the physical features of the State holds good for a length of 400 miles, in the direction of the main axial line, and this division of California is the largest and by far the most important, comprising almost the whole of the agricultural and the greater part of the mining districts, and may be designated as Central California ; that portion to the south of a line drawn at right angles to the main axial...
Stran 163 - TV of an inch thicker than the iron of the pipe, and with a play of ^ of an inch between the inside of the collar and the outside of the pipe : b is the lead, which is run in and then calked tight from both sides ; c is a nipple of No. 9 iron, 6 inches in width, riveted on one end of each pipe by means of six rivets.