. Mining and Scientific Press . the other hand, thecrushed ore is handled most economically on a belt. TheMarcymill (No. 86) and each of the three 8 Hardinge mills is followed, in a separate unit, byeither a (i by 12 ft. or a 7 by 10-tt. tube-mill or aHardinge mill used as a re grinder; for convenience, eachot tin- eighl mills is arranged so that it maj he run inclosed circuil with a (i by -1 ft. Dorr classifier. Usually,however I e producl from tic primary classifiers forms the feed for tic re grinders. The detailed arrange- maj be seen on the flow-sheet, Oi f the classifiers chin
. Mining and Scientific Press . the other hand, thecrushed ore is handled most economically on a belt. TheMarcymill (No. 86) and each of the three 8 Hardinge mills is followed, in a separate unit, byeither a (i by 12 ft. or a 7 by 10-tt. tube-mill or aHardinge mill used as a re grinder; for convenience, eachot tin- eighl mills is arranged so that it maj he run inclosed circuil with a (i by -1 ft. Dorr classifier. Usually,however I e producl from tic primary classifiers forms the feed for tic re grinders. The detailed arrange- maj be seen on the flow-sheet, Oi f the classifiers chine: tic others are type l>. The experi-ence here has been that the heavier mnchini typi I >. isfar more satisfactory. On reason for this is the fact thatthe machines have bei ded up to :!:; strokes per minute, as compared with a normal <<\ IS to 20. with thepurpose in view of causing sufficient agitation to main-tain an overflow iii which 10%. bv drv weight, of the AurusI 6, 192] MINING AND S< 1! Mil I- lKESS 185. NEW MIIJ, OF TUP: ENGELS COPPER COMPANY 186 MINING AND St II \ I UK Anjusi 6. 1921
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