By S. V. Griffith
Alluvial Prospecting and Mining (Second Revised version) specializes in the emergence of more advantageous mining concepts and strategies utilized in the excavation of alluvial deposits.
The e-book first bargains info at the prospecting tools, sampling, and valuation. Discussions specialise in initial systematic prospecting, drilling in tough flooring, supervision of drilling, price 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. subject matters contain rock pavements, undercurrents, fake bottoms, glean up, tailings, flooring sluicing, water required, exploitation of crops, electrostatic separation, and excessive depth magnetic separators. The ebook additionally studies ahead practise of overburden, hydraulic mining, and gravel pumping.
The e-book is a liable reference for miners and readers drawn to alluvial prospecting and mining.
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Additional resources for Alluvial Prospecting and Mining
W x Lx C v l u. Value per cubic yard, m pence, = — where w = weight of gold obtained, in grains, L = lineal feet of casing to equal one cubic yard, SAMPLING AND VALUATION 43 C = price of gold, in pence per grain, and D = depth of bore hole, in feet. If preferred, the following formulae may be used for working out the results: 7ΓΤ2 X D „ 144 where cu. ft, V = volume of the sample obtained from the bore hole, r = external radius of the cutting shoe, in inches, D = depth of bore hole, in feet and Vxll where W = value per cubic yard, in pence, zo = weight of gold, in grains, and C = price of gold, in pence per grain.
By imparting a pumping motion to the beam, the casing will be withdrawn easily (see Fig. 18). Should a string of casing become stuck in a bore hole, it will be necessary to use the casing jack (No. 65). Fishing tools. Various fishing tools are recommended by the makers of the Banka drill, viz. : (a) the overshot, which consists of a socket with internal springs, is screwed to the sand pump and lowered into the bore hole, to fish up a drill rod that has become unconnected; the internal springs clip under the collar of the rod and thus ensure a good grip being maintained.
20in. »I FIG. 17. Wooden rammer. a rod turner to the drill rods, so that it rests upon the top of the platform socket, and then resume turning. Owing to the fact that the rod turner prevents the auger from descending, cohesion between the clay loosened by the auger, and the wall of the hole, is broken, and results in the freeing of the auger. (b) Quicksand. Quicksand may rise in the casing as fast, or even faster than it can be removed by the bailers; it is best, in such ground, to keep the water level inside the casing as high as possible, and to drive down the casing to firmer ground, as quickly as possible.
Alluvial Prospecting and Mining by S. V. Griffith