The Bunker Hill Enterprise: An Account of the History, Development, and Technical Operations of the Bunker Hill & Sullivan Mining & Concentrating Company, at Kellogg, Idaho, U. S. a
The Bunker Hill Enterprise: An Account of the History, Development, and Technical Operations of the Bunker Hill & Sullivan Mining & Concentrating Company, at Kellogg, Idaho, U. S. a
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...ore coming out of the mine through the Kellogg adit is delivered by electric trains into a storage-bin of 1400 tons capacity. From the bin it passes through open chutes onto a 42-in. belt-conveyor, the speed of which varies from 17 to 55 ft. per minute, as regulated by a Reeves variable-speed drive. The essential ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...ore coming out of the mine through the Kellogg adit is delivered by electric trains into a storage-bin of 1400 tons capacity. From the bin it passes through open chutes onto a 42-in. belt-conveyor, the speed of which varies from 17 to 55 ft. per minute, as regulated by a Reeves variable-speed drive. The essential feature of this device is a double cone supporting a belt mounted on wooden blocks cut to the taper of the cone that gives the friction to the drive. The interval between the cones, and the consequent diameter, is increased or decreased by a sprocket control. The mine-run of ore carried by the belt-conveyor passes under a 36-in. electro-magnet, which removes hammer heads and other pieces of steel; thence the ore falls over a grizzley having 1-in. openings and into two No. 5 bronze-ball crushers, the discharge from which joins the undersize from the grizzley and is conveyed on a belt to three trommels of 30-mm. screen. The undersize from the trommels passes to a storage-bin, while the oversize is removed to a 36-in. Symons vertical-disc crusher, set to inch, or 20 mm. The discharge from the crusher is conveyed to one 30-mm. trommel, the undersize from which goes to the storage-bin, while the oversize joins the discharge from the crushers, in closed circuit. This completes the crushing operations. See Fig. 7. Next comes the coarse concentrating and grinding. From the stor age-bin the ore is fed by five belt-driven Challenge feeders to a belt-conveyor inclined at an angle of 2230 The belt-driven feeders give a remarkably uniform supply and require the minimum of attention, as the -inch wearing-plate on the revolving disc will last for a year. The feeders are driven from the tail-pulley of the conveyor. A third of the way up the conveyor-incline ...
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