By S. V. Griffith
Alluvial Prospecting and Mining (Second Revised variation) specializes in the emergence of more suitable mining recommendations and techniques utilized in the excavation of alluvial deposits.
The publication first deals details at the prospecting tools, sampling, and valuation. Discussions concentrate on initial systematic prospecting, drilling in tough flooring, supervision of drilling, fee 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 publication additionally studies ahead education of overburden, hydraulic mining, and gravel pumping.
The book is a liable reference for miners and readers drawn to alluvial prospecting and mining.
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I-RTI9 - L ί - 2 A Ì -20L· 1 I ^2-2*Γ&^2 6 119'0-4-f l 8 ' | | "t 0-3" Ί8' 1-6- -18' 1-8- -18' [ -j" j 2-4-fl8' 2-2-t-18' 0-4-+ 19' 1 2-4" Ί 9 \ (■ 0-4- •19' 2-1-5he' 1 -j\ I ! I ! «,______)1 [~ ^ T " ^ - - 1- ^ D 2-8" ""f""^ ! t ! j FIG. 36. Line system boring plan, for calculation of reserves. a unit of representation of 25 is taken instead as the weighting given to each bore hole, in the centre of a 100 x 25 ft rectangle; holes on the boundaries have been weighted in proportion to the areas of their zones of influence.
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. On the other hand, when boring in a sandy clay, losses may be occasioned by the action of the sand pump, as sliming takes place producing slimy material from the hard core and, if this is not watched carefully, may result in incorrect results being obtained; the constant pile-driving effect of the pump working in a sand forma tion, may force the sand away from the cutting shoe, while in pebbly ground the drilling tool may force wash ahead of it, for several feet, without bringing up 42 SAMPLING AND VALUATION more than a small amount of sample.
Fig. , and fitted with riffles, and a tailings piece, also fitted with riffles. The material to be washed is shovelled into the hopper and thence on to the screen, water poured over it, and the cradle given a rocking motion. The water and undersize pass through the screen perforations (about f in. diameter), on to the inclined apron, and is discharged over the tailings piece. Most of the mineral FIG. 25. Cradle or rocker. SAMPLING AND VALUATION 35 contents and heavy sand are caught by the riffles on the apron, and the fine material by the riffles on the tailings piece.