Bulletin . A. METHOD OF DUMPING TUB ON GRIZZLY ABOVE B. BLAKE CRUSHER, MOUNTED ABOVE PRIMARY ROLL OKE-DRESSING PRACTICE. 55 and also the relative capacity of the mill; makes possible a higherrecovery; lessens the wear and tear on rolls, elevators, screens, andother equipment, and saves the power that would be consumed intreating waste rock. At one of the sheet-ground mines hand-pick-ing the ore just before it entered the crusher was tried to good advan-tage, and a considerable saving in both mineral and costs per tonwas said to have been made. If a system of sorting underground,especi
Bulletin . A. METHOD OF DUMPING TUB ON GRIZZLY ABOVE B. BLAKE CRUSHER, MOUNTED ABOVE PRIMARY ROLL OKE-DRESSING PRACTICE. 55 and also the relative capacity of the mill; makes possible a higherrecovery; lessens the wear and tear on rolls, elevators, screens, andother equipment, and saves the power that would be consumed intreating waste rock. At one of the sheet-ground mines hand-pick-ing the ore just before it entered the crusher was tried to good advan-tage, and a considerable saving in both mineral and costs per tonwas said to have been made. If a system of sorting underground,especially in the sheet-ground mines, could be developed, or evena lai^e proportion of waste rock sorted out by the screenmen atthe grizzly, the writer believes that an appreciable saving would beeffected. CBUSHING AND SCREENING. The undersize material, 5 inches or less in diameter, passes throughthe openings of the grizzly into the mill hopper below. From thehopper the ore is fed by means of an incline chute into a jaw crusherof the Blake type (PI. XIII, B), whe
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
