Read e-book online Alluvial Prospecting and Mining PDF

By S. V. Griffith

ISBN-10: 0080093310

ISBN-13: 9780080093314

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

The ebook first deals details at the prospecting tools, sampling, and valuation. Discussions specialize in initial systematic prospecting, drilling in tricky floor, supervision of drilling, cost of excavation, pitting and drilling in comparison, sampling of bore holes, and calculation of reserves. The booklet 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 contain rock pavements, undercurrents, fake bottoms, glean up, tailings, floor sluicing, water required, exploitation of crops, electrostatic separation, and excessive depth magnetic separators. The booklet additionally experiences ahead education of overburden, hydraulic mining, and gravel pumping.

The e-book is a in charge reference for miners and readers attracted to alluvial prospecting and mining.

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Sample text

So that the variation ranges from 215 to 243 lineal feet to the cubic yard. In the author's opinion, the pipe factor for calculating sample results should only be used for those deposits that occur in clayey formations, as in this type of ground a core is produced that checks very closely with the theoretical tube content; as an example, this method is used successfully, in Northern Nigeria, where the alluvial tin deposits are in a lateritic clay. , the corresponding area will be 17-87 sq. , or 0-1241 sq.

However, it is pointed out that there is no foundation for this idea, as samples can be taken at any convenient interval, but a new sample must always be taken when there is any change in the formation being drilled through; also, when drilling through mineral-bearing wash, it makes for greater accuracy, to take samples at one foot intervals. (a) Calculating sample results by pipe measurement or pipe factor {theoretical tube content). Theoretically, the area of the cutting shoe, estimated from its external diameter, multiplied by the depth of the bore hole, should equal the volume of the sample obtained, but in most instances, except in rising sand, it is found that the material so recovered is less in volume than the theoretical content; drilling in clay and clayey formations, however, with an auger and sand pump, does pro­ duce a core that checks closely with the theoretical tube content.

1800 1134 ! 997-5 ! 1850 1850 1890 j 1440 1332 1850 360 1368 1628 1850 1662-5 | " 148 ! 1110 1800 277-5 1738-8 945 1197 259-2 1008 ! 24056 Average depth = — ~ — = ~^r Z X D x Y Average value = — z x D— | ! ί 57 41509 = 36-2 ft 41509 24056 = per ^* y Area (by planimeter) = 7200 sq. yd Some engineers, when grid boring an area, stagger their holes so that the drill­ ing pattern is as shown in Fig. 38; in this case, the first step is to ascertain the zone of influence of each bore, which is done by erecting perpendiculars at right angles to, and bisecting the lines joining adjacent bores, and prolonging same, until they intersect one another.

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Alluvial Prospecting and Mining by S. V. Griffith

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