. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. 218 to 220. The products of the table are accumulated in four cases, of which oneis under the spitzkasten (v) and the three others are outside the building. The waste waters from the spitzkasten and the cases of the table passfirst of all into four preparatory basins, and then into the main slime pits,where they are clarified by settling. Of these there are four, each of anarea of 40 metres and a depth of 4 metres. A single basin is sufficientfor the accumulation of slimes duri
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. 218 to 220. The products of the table are accumulated in four cases, of which oneis under the spitzkasten (v) and the three others are outside the building. The waste waters from the spitzkasten and the cases of the table passfirst of all into four preparatory basins, and then into the main slime pits,where they are clarified by settling. Of these there are four, each of anarea of 40 metres and a depth of 4 metres. A single basin is sufficientfor the accumulation of slimes during two-and-a-half to three are constructed in masonry, and in the centre of the four walls is acircular pit, at the bottom of which are the mouths of four galleries, eachof which ends at the lowest point of each of the basins, which is closedwith planks. When it is desired to empty a basin the planks are removed, the slimeloaded in trucks, which are run to the pit and raised by a winch. The clarified waters are led back to the centrifugal pump (p), by means [PLATE XIII. Fig. ON LINE E Fic. 3W--SECTI0N ON LINE Ct ON LINE G. H. Figs. 298 to 301.—The Neuhof Concentration Mill for Lead and Zinc On LEAD AND CALAMINE CONCENTRATION PLANT. 453 of which they are Hfted to a reservoir 9 metres higher, from which pointagain a part of the water is raised another 9 metres by means of thecentrifugal (p). (See figs. 296 and 297, Plate XII.) The classifying trommels, the classifiers, picking table, and Linkenbachtable are supplied with fresh, clean water, which is supplied from areservoir at some distance from the mill. All the other machines receivethe clarified water from the settling pits. In the driving gear the use of toothed gearing has been minimised,and in no case are cone wheels used. There are four main lines ofshafting, of which the principal is driven by means of cables from thesteam-engine. To these the machines are connected by means of ind
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