. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fig. 255.—Clean-up Pan. ;88 MACHINERY FOR METALLIFEROUS MINES. and of an indefinite length, and may Ije as long as 300 ft., with a fallof from I to I in. per foot. They are covered with coarse l^lankets cutinto long strips, in the fibre of which the heavier grains of sulphides andparticles of amalgam are retained. The blankets are taken up from timeto time and washed in clean water, the stream of tailings being divertedin the meantime down a parallel line of blanket troughs. Th
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fig. 255.—Clean-up Pan. ;88 MACHINERY FOR METALLIFEROUS MINES. and of an indefinite length, and may Ije as long as 300 ft., with a fallof from I to I in. per foot. They are covered with coarse l^lankets cutinto long strips, in the fibre of which the heavier grains of sulphides andparticles of amalgam are retained. The blankets are taken up from timeto time and washed in clean water, the stream of tailings being divertedin the meantime down a parallel line of blanket troughs. The con-centrates thus obtained are worked up in pans, and usually realise from£4 to ;^6 per ton, thereby materially adding to the milling returns, andreducing the original cost of crushing and amalgamation. Blanket tablesare shown below the plates in fig. 182 of Hornsbys battery (p. 270).. Fig. 256.—Clean-up Pan. The saud sluice can be employed with advantage wherever blanketsluices are used, and if placed before them will relieve them from muchcoarse and heavy material. They are formed of a long shallow woodentrough from 20 in. to 24 in. wide, in which vertical guides are placed atintervals of from 8 ft. to 10 ft. Into these guides thin riffle pieces areslipped, which act as shallow dams ; the sands run over these for a time,say for one or more hours, when another course of riffles, \ in. or sothick, is laid on top of the others. This is repeated until the sluice isfull, when it is shovelled out, the tailings in the meantime runningthrough a duplicate sluice. The inclination at which the sluice is laidis about 3I in. in 16 ft. The current is then under control; for, by THE BOSS AMALGAMATING PROCESS. 189 Starting with a thin riffle at the bottom, a strong current may be obtained,and a thick one may reduce it as may be required. The Boss Continuous Process.—In the pr
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