Alluvial Prospecting and Mining by S. V. Griffith
By S. V. Griffith
Alluvial Prospecting and Mining (Second Revised variation) specializes in the emergence of better mining suggestions and strategies utilized in the excavation of alluvial deposits.
The booklet first deals details at the prospecting equipment, sampling, and valuation. Discussions specialize in initial systematic prospecting, drilling in tough floor, supervision of drilling, cost of excavation, pitting and drilling in comparison, sampling of bore holes, and calculation of reserves. The e-book 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, flooring sluicing, water required, exploitation of crops, electrostatic separation, and excessive depth magnetic separators. The ebook additionally experiences ahead guidance of overburden, hydraulic mining, and gravel pumping.
The ebook is a accountable reference for miners and readers attracted to alluvial prospecting and mining.
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Extra info for Alluvial Prospecting and Mining
All details are then entered up in the data sheet (see Fig. 31). Sampling of pits. Pits are sampled by: (a) making a cut from surface into bedrock, in the side of each pit, and panning the resulting material. (b) stacking all the spoil excavated from each pit, in a cone, and quartering in the usual way, until the bulk has been reduced to a small sample, suitable for panning, and (c) washing the entire material excavated from each pit, using rockers, long toms, sluice boxes, etc. At the very outset, the author makes the statement that the only accurate and satisfactory method, is that given under (c), that is, washing the entire contents of the pit; his contention is, why sink a pit and take a cut sample, when just as accurate a sample could be obtained by drilling a bore hole.
Ft. 01241 Therefore, every foot of casing will contain ——— cu. yd = 0Ό04596 cu. yd, or 217 lineal feet of casing will be equivalent to one cubic yard of material. The author does not agree with the system of basing all calculations on the internal diameter of the shoe; the cutting edge of the casing shoe is bevelled on the inside, and it is justifiable to assume that all the material cut by the bevelled edge will be pushed inwards to become an integral part of the sample. Moreover, the diameter of the bore hole is theoretically equal to the outside diameter of the casing shoe, and as all the cuttings go to form the sample, the external measure ment is the obvious one to employ.
Long, divided into tenths, will represent tenths of a £ cu. ft (see Fig. 33); the reading registered on the calibrated rod, subtracted from 10, gives the volume of the clayey material in the box. The slime squeezed from the clayey material, together with the wash water used to wash the inside and outside of the pump or auger, is put into a draining bag, and left overnight to drain; when free of excess water, it is introduced into the water displacement box, allowed to settle, and then measured-as already described.