. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Rings are formed aroundthe deposit on the buddle to indicate the division lines. The rich heads,are taken out and reworked once in another buddle, when they will berich enough to be sent to the dolly tub (fig. 221-223). The middles arelikewise retreated, the ores of approximately the same percentage beingtreated in the same machine until all the mineral is abstracted, and thewaste contains not more than 4 per cent, of lead, and i to 15 per cent. ;o4 MACHINERY FOR METALLIFEROUS
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Rings are formed aroundthe deposit on the buddle to indicate the division lines. The rich heads,are taken out and reworked once in another buddle, when they will berich enough to be sent to the dolly tub (fig. 221-223). The middles arelikewise retreated, the ores of approximately the same percentage beingtreated in the same machine until all the mineral is abstracted, and thewaste contains not more than 4 per cent, of lead, and i to 15 per cent. ;o4 MACHINERY FOR METALLIFEROUS MINES. of zinc. By successive retreatment the minerals may thus be enrichedup to 50 to 60 per cent. Pb., and when blende is present, to about 42 percent. Zn. These concentrates may either be sold as they are, or furtherenriched in a dolly tub. The great drawbacks to the round buddle are the facts that no cleanproducts can be made straight away. The mineral must be handledseveral times, always a costly proceeding, and the machine must bestopped when full, and lie idle until emptied. A large number of buddies r^. Section. Plan. Fig. 2og.—The Concave Buddle. are always required to cope with the slimes from even a small mill; thatshown in fig. 308A would require three or four, while in large mills,especially when blende is present, from sixteen to twenty would be needed. The Concave Buddie.—The buddle which has just been described,might also be appropriately called a convex buddle, seeing that the centreis higher than the circumference, and in contradistinction to this we haveBorlases concave bundle, shown in fig. 209, in which the circumferenceis higher than the centre where the discharge takes place. THE KNIFE BUDDLE. O^D This buddle is suitable for the enriching of the heads of the roundbuddies, which may be broken up and thinned in the mixer (m), and bedeprived of any coarse, foreign matter, by the screen (n). For thispurpose the mixer shown in fig. 207 is particularly well
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