By S. V. Griffith
Alluvial Prospecting and Mining (Second Revised variation) specializes in the emergence of enhanced mining recommendations and strategies utilized in the excavation of alluvial deposits.
The booklet first bargains info at the prospecting equipment, sampling, and valuation. Discussions concentrate on initial systematic prospecting, drilling in tricky 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 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, flooring sluicing, water required, exploitation of vegetation, electrostatic separation, and excessive depth magnetic separators. The e-book additionally studies ahead guidance of overburden, hydraulic mining, and gravel pumping.
The booklet is a in charge reference for miners and readers attracted to alluvial prospecting and mining.
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Extra info for Alluvial Prospecting and Mining
Samples from the overburden, gravel and bedrock, should be washed sepa rately; for estimating results, some engineers calculate the cubic capacity of the cut, weigh the concentrates obtained, and by proportion compute the value per cubic yard, while others employ a factor, similar to the pipe factor used in drilling. In method (ό), as already stated, the entire contents of the pit are piled into a cone, flattened, and then quartered in the usual way; the procedure is repeated until a small sample results, which is then washed.
The casing shoe should be kept ahead of the drilling tool, by some 10 to 12 in. to ensure that the sample obtained is a truly representative one. The "digger" gives good results in the pitting of alluvial deposits, where the wash consists of coarse gravel with pebbles over 6 in. in diameter, and where the maximum depth to bedrock does not exceed 100 ft to 120 ft. Withdrawal of casing· For pulling out the casing after finishing a pit, the casings are rotated with the machine, at the same time being pulled out with a pulley block, which is hanging ready from the mast, for this purpose.
For gold alluvials, the calculation for the value of the ground would consist in multiplying the weight of gold obtained, in grains, by the lineal feet of casing equivalent to one cubic yard, and dividing the result by the depth of the bore hole; the figure thus obtained multiplied by the price of gold, in pence, would give the monetary value per cubic yard, thus: , . 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.