Prospecting Locating And Valuing Mines a Practical Treatise for the Use of Pro
Prospecting Locating And Valuing Mines a Practical Treatise for the Use of Pro
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In our eReader you can find the full English version of the book. Read Prospecting Locating And Valuing Mines a Practical Treatise for the Use of Pro Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Prospecting Locating And Valuing Mines a Practical Treatise for the Use of Pro
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In such cases we are com- pelled to resort to hydraulic elevators, by which the gravel is lifted from 30 to 50 ft. Or over and there dumped into the sluice boxes, which can then be from 29S PROSPECTING AND VALUING MINES.
one-eighth to a quarter of a mile longer than would otherwise be possible. The method is of course only available on moderately coarse material, as the diame- ter of the tube and the force of the lifting jet prevent the passage of very coarse material.
River Bars. These usually... form at the junction of two streams, or just below the point at which the cur- rent is deflected from one side of the river to another. If a stream is auriferous, these bars are often rich in gold, which is brought down in flood time from the upper country, often many miles. The Snake, Colum- bia and Fraser Rivers are good examples of such streams, in addition to the well known California localities. On the Fraser, at Yale, the amount of fine gold brought down by the stream, to localities not less than 50 miles from the source of supply, is so great that the surface of the pebbly bars, which act as riffles, pays to work over annually; and a panful of moss gathered from the bowlders exposed between high and lo\v water mark, will show from fifty to several hun- dred colors.
What to read after Prospecting Locating And Valuing Mines a Practical Treatise for the Use of Pro?
You can find similar books in the "Read Also" column, or choose other free books by R H Richard Henry Stretch to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In such cases we are com- pelled to resort to hydraulic elevators, by which the gravel is lifted from 30 to 50 ft. Or over and there dumped into the sluice boxes, which can then be from 29S PROSPECTING AND VALUING MINES.
one-eighth to a quarter of a mile longer than would otherwise be possible. The method is of course only available on moderately coarse material, as the diame- ter of the tube and the force of the lifting jet prevent the passage of very coarse material.
River Bars. These usually... form at the junction of two streams, or just below the point at which the cur- rent is deflected from one side of the river to another. If a stream is auriferous, these bars are often rich in gold, which is brought down in flood time from the upper country, often many miles. The Snake, Colum- bia and Fraser Rivers are good examples of such streams, in addition to the well known California localities. On the Fraser, at Yale, the amount of fine gold brought down by the stream, to localities not less than 50 miles from the source of supply, is so great that the surface of the pebbly bars, which act as riffles, pays to work over annually; and a panful of moss gathered from the bowlders exposed between high and lo\v water mark, will show from fifty to several hun- dred colors.
What to read after Prospecting Locating And Valuing Mines a Practical Treatise for the Use of Pro?
You can find similar books in the "Read Also" column, or choose other free books by R H Richard Henry Stretch to read onlineMoreLess
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