By S. V. Griffith
Alluvial Prospecting and Mining (Second Revised variation) makes a speciality of the emergence of better mining innovations and strategies utilized in the excavation of alluvial deposits.
The ebook first bargains info at the prospecting equipment, sampling, and valuation. Discussions specialize in initial systematic prospecting, drilling in tough flooring, supervision of drilling, expense 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. issues contain rock pavements, undercurrents, fake bottoms, glean up, tailings, floor sluicing, water required, exploitation of vegetation, electrostatic separation, and excessive depth magnetic separators. The publication additionally studies ahead practise of overburden, hydraulic mining, and gravel pumping.
The book is a accountable reference for miners and readers drawn to alluvial prospecting and mining.
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General hints. A few useful hints on drilling may be given here: (a) The casing shoe must always be kept in advance of the cutting edge of the 26 PROSPECTING METHODS A. Using stand and pulling cap. B. Using a chain sling. FIG. 18. Withdrawal of casing. drilling tool; knowing that the casing and rods are in standard lengths of 5 ft, or are made up to this length, it follows that the depth of the casing shoe in the bore hole, in feet, is five times the number of casings that have been introduced into the ground, less the length of casing projecting above ground level.
One pound per cubic yard. As all concentrates are to be dressed to 70% Sn, and the assay of the con centrate also gave 70% Sn, the value of the hole remains at one pound per cubic yard; if, however, the assay result gave, say, 65% Sn, then the value of the bore hole would have to be corrected, by multiplying it by 65 and dividing by 70, thus l -^^ = 0-93 lb per cu. yd, 70% Sn. The sand percentage of the bore hole contents is calculated by dividing the total of column 11 by the total of column 10, and multiplying the result by 100; .
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. The resultant figure will be a six-sided figure, such as "abcdef " around bore hole B-4, Fig. 38, and will be the particular area with regard to bore B-4. For calculating purposes, the area of the figure "abcdef" is measured by plani meter, and the volume obtained by multiplying by the depth of the bore hole, 58 SAMPLING AND VALUATION the other estimations being performed in exactly the same manner as already described.
Alluvial Prospecting and Mining by S. V. Griffith