Download PDF by S. V. Griffith: Alluvial Prospecting and Mining

By S. V. Griffith

ISBN-10: 0080093310

ISBN-13: 9780080093314

Alluvial Prospecting and Mining (Second Revised variation) specializes in the emergence of more suitable mining options and techniques utilized in the excavation of alluvial deposits.

The publication first deals info at the prospecting equipment, sampling, and valuation. Discussions concentrate on initial systematic prospecting, drilling in tricky flooring, supervision of drilling, cost of excavation, pitting and drilling in comparison, sampling of bore holes, and calculation of reserves. The ebook then examines water provide, together with earth dams, spillways, leats, ditches, or canals, and layout of pipelines.

The manuscript ponders on sluicing and dry focus of minerals. themes comprise rock pavements, undercurrents, fake bottoms, glean up, tailings, floor sluicing, water required, exploitation of vegetation, electrostatic separation, and excessive depth magnetic separators. The booklet additionally studies ahead training of overburden, hydraulic mining, and gravel pumping.

The ebook is a liable reference for miners and readers attracted to alluvial prospecting and mining.

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Extra info for Alluvial Prospecting and Mining

Sample text

1), screwed on; a long wooden beam or length of rail is then placed over the pin of the pulling stand (No. 34), and through the swivel ring of the cap, and a downward pressure maintained on the end of the beam or rail. If this does not move the casing, another beam or rail is passed through the lateral rings on the pulling cap, with which to partially rotate the casing, by a shaking and twisting movement, while the downward pressure on the first beam is still maintained. Instead of using the pulling stand, supplied by the makers, a tree trunk, 2 ft in diameter, can be employed as the fulcrum.

Wide by 3 in. deep; cuts should always be made in the same side in each pit, for instance, on the downstream side or the upstream side, and in shallow pits it is usual to take two cuts, on opposite sides of the pit. Samples from the overburden, gravel and bedrock, should be washed sepa­ rately; for estimating results, some engineers calculate the cubic capacity of the cut, weigh the concentrates obtained, and by proportion compute the value per cubic yard, while others employ a factor, similar to the pipe factor used in drilling.

Wide by 3 in. deep; cuts should always be made in the same side in each pit, for instance, on the downstream side or the upstream side, and in shallow pits it is usual to take two cuts, on opposite sides of the pit. Samples from the overburden, gravel and bedrock, should be washed sepa­ rately; for estimating results, some engineers calculate the cubic capacity of the cut, weigh the concentrates obtained, and by proportion compute the value per cubic yard, while others employ a factor, similar to the pipe factor used in drilling.

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Alluvial Prospecting and Mining by S. V. Griffith


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