. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. 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,
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. 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 process of wet crushingof silver ores, which has just been described, it will have been noticedthat the pulp, after leaving the battery, is allowed to settle in vats, andthat the solid matter is then shovelled into the amalgamating pans. Allthis handling is costly and takes up time, and the attention of inventive. Fig. 257.—Amalgamating Plant. men has long been turned to devising some scheme by which it could beavoided, so that the pulp might flow on in a continuous stream from thescreens through the grinding, amalgamating, and settling pans, leaving itsrich contents on the way, and passing from the mill in the state of sterileslimes, without its progress being interrupted by any settling tanks. Mr. M. P. Boss, an American metallurgist, has devised and put intosuccessful practice such a process; and from the experience alreadygained, it would appear that it can be successfully applied to any oresadapted to pan treatment, with a considerable saving in time and cost. 190 MACHINERY FOR METALLIFEROUS MINES. A plan and section of a 30-stamp silver mill for the Boss continuousprocess is given in figs. 258 and 259. The ore from the mine arrives bythe tramways (a, a) and is tij)ped ove
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