By S. V. Griffith
Alluvial Prospecting and Mining (Second Revised variation) specializes in the emergence of more suitable mining innovations and strategies utilized in the excavation of alluvial deposits.
The publication first bargains info at the prospecting tools, sampling, and valuation. Discussions specialise in initial systematic prospecting, drilling in tricky floor, supervision of drilling, fee of excavation, pitting and drilling in comparison, sampling of bore holes, and calculation of reserves. The e-book then examines water offer, 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 e-book additionally experiences ahead training of overburden, hydraulic mining, and gravel pumping.
The booklet is a in charge reference for miners and readers drawn to alluvial prospecting and mining.
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Additional info for Alluvial Prospecting and Mining
Long torn. This is an open sluice box, 12 ft long, lined at the bottom with £ in. sheet iron, and widening from 20 in. at the top, to 30 in. at the bottom, which is cut off at an angle of 45 degrees, and closed by a perforated screen, usually with \ in. holes; below the screen is fixed another sluice box, 12 ft long and 3 ft wide, fitted with riffles (see Fig. 26). The boxes are usually given a grade of 12 to 18 in. per 12 ft. A flume or launder " L ", delivers water to the upper end of the long torn, into which the dirt is shovelled; large stones are forked out, whilst the dirt is worked through towards the perforated end, all lumps of clay being well puddled.
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.
When the concentrates, obtained from all samples from one bore hole, are complete, they are lumped together for assay; in the case of tin concentrates, it should be remembered that 454 gm = 1 lb, or 1 gm = 0-0022 lb, and as £ cu. ft = iö8 cu. yd, then 1 gm of tin oxide from £ cu. ft, gives a value of 108 x 0-0022 = 0-2376 lb per cu. yd, or 4-21 gm of cassiterite from £ cu. ft box will give a value of 1 lb per cu. yd. Field book. A specimen page of a field book for the above procedure of measurement, by water displacement and "dry" box, is given in Fig.