Dental Metallurgy, for the Use of Dental Students And Practitioners
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In our eReader you can find the full English version of the book. Read Dental Metallurgy, for the Use of Dental Students And Practitioners 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 Dental Metallurgy, for the Use of Dental Students And Practitioners
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(3) Dredging.
Placer Mining. — Placer mining is at the present time rarely used because of the heavy loss of gold entailed by its use; this may amount to 50 per cent, of gold present in the pay dirt. At one time the prospectors used the so-called 'pan.
In panning, a black sheet-iron, sheet-tin or wooden pan, about 16 inches in diameter and 2 inches deep, was used.
The pan was filled about two-thirds full of pay dirt and then held in a stream or pool of water. The pan was given a twisting motion... and the heavier particles of gold descended to the bottom of the pan. The cradle and the Long Tom are other devices for carrying on this same process on a larger scale. At the present time they are used to some extent by the Chinese of California, in washing tailings which have already been washed several times. With the cradle a man may wash 1| cubic yards of gold-bearing sand in a day, while with the Long Tom two men can wash about 8 cubic yards. The loss of gold by these methods is also very heavy.
What to read after Dental Metallurgy, for the Use of Dental Students And Practitioners?
You can find similar books in the "Read Also" column, or choose other free books by Brady, Ewing Paul to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
(3) Dredging.
Placer Mining. — Placer mining is at the present time rarely used because of the heavy loss of gold entailed by its use; this may amount to 50 per cent, of gold present in the pay dirt. At one time the prospectors used the so-called 'pan.
In panning, a black sheet-iron, sheet-tin or wooden pan, about 16 inches in diameter and 2 inches deep, was used.
The pan was filled about two-thirds full of pay dirt and then held in a stream or pool of water. The pan was given a twisting motion... and the heavier particles of gold descended to the bottom of the pan. The cradle and the Long Tom are other devices for carrying on this same process on a larger scale. At the present time they are used to some extent by the Chinese of California, in washing tailings which have already been washed several times. With the cradle a man may wash 1| cubic yards of gold-bearing sand in a day, while with the Long Tom two men can wash about 8 cubic yards. The loss of gold by these methods is also very heavy.
What to read after Dental Metallurgy, for the Use of Dental Students And Practitioners?
You can find similar books in the "Read Also" column, or choose other free books by Brady, Ewing Paul to read onlineMoreLess
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