Download e-book for iPad: Alluvial Prospecting and Mining by S. V. Griffith

By S. V. Griffith

ISBN-10: 0080093310

ISBN-13: 9780080093314

Alluvial Prospecting and Mining (Second Revised variation) makes a speciality of the emergence of more desirable mining innovations and techniques utilized in the excavation of alluvial deposits.

The ebook first deals details at the prospecting equipment, sampling, and valuation. Discussions specialise in initial systematic prospecting, drilling in tough floor, supervision of drilling, expense of excavation, pitting and drilling in comparison, sampling of bore holes, and calculation of reserves. The booklet 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. issues comprise rock pavements, undercurrents, fake bottoms, glean up, tailings, floor sluicing, water required, exploitation of crops, electrostatic separation, and excessive depth magnetic separators. The booklet additionally studies ahead guidance of overburden, hydraulic mining, and gravel pumping.

The e-book is a responsible reference for miners and readers drawn to alluvial prospecting and mining.

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Extra resources for Alluvial Prospecting and Mining

Example text

It is stated that the following progress can be expected from the pit digger, per hour: (a) in sand 6 | - 8 ft (6) in stiff clay 3\ - 8 ft (c) in more or less loose gravel and sand 3 - 4 ft (d) in compact gravel with boulders 1 - 2 ft Fig. 22 shows the pit digger in action. FIG. 22. The Conrad pit digger. PROSPECTING METHODS 32 Pitting and drilling compared. Both methods have their supporters, but in general it should be stated that pitting is more reliable than drilling, especially in new country.

Boring lines while the other set is parallel to the boring lines; in other words, the plan is again gridded by the two sets of lines, as shown in Fig. 37. From this it will be noted that each bore hole is in the centre of a square, and therefore if drilling has been done on 50 ft centres, each hole will represent an area of 50 x 50 ft, or 2500 sq. ft; as before, holes near the boundaries of the area will be weighted according to their zones of influence. The other difference in the grid system is that the average value of each small square or grid is estimated by multiplying the volume of this block by the grade of the hole assigned to it, and repeating the procedure for each bore in the area, until the whole deposit has been valued; the calculation of the average grade of a series of separate blocks of ground between two adjacent lines, as is done in the line system, is not applicable here.

1850 1710 1296 1 189 | 1942-5 ! 1750 ! 1800 1134 ! 997-5 ! 1850 1850 1890 j 1440 1332 1850 360 1368 1628 1850 1662-5 | " 148 ! 1110 1800 277-5 1738-8 945 1197 259-2 1008 ! 24056 Average depth = — ~ — = ~^r Z X D x Y Average value = — z x D— | ! ί 57 41509 = 36-2 ft 41509 24056 = per ^* y Area (by planimeter) = 7200 sq. yd Some engineers, when grid boring an area, stagger their holes so that the drill­ ing pattern is as shown in Fig. 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.

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Alluvial Prospecting and Mining by S. V. Griffith

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