Bulletin of the American Institute of Mining Engineers Volume 121-126 by American Institute of Engineers
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Author: American Institute of Engineers
Page Count: 578 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130568219
File Name: Bulletin.of.the.American.Institute.of.Mining.Engineers.Volume.121-126.pdf
Download Link: Bulletin of the American Institute of Mining Engineers Volume 121-126
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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. 1917 Excerpt: ...17,000 gal. per minute and pumping plants under construction for an additional 10,000 gal. per minute. None of the mines are directly connected underground at this time, but because of fissures and caves in the rock, the water during flood times drains from one to the other, making it necessary to have concrete bulkheads and very large pump installations. The high-speed centrifugal pump is largely used, although plunger pumps of the horizontal duplex and vertical triplex type comprise part of the equipment. All the pumps are motor-driven, either direct-or gear-connected. Power Electrical power is obtained from the Tennessee Power Co.'s hydroelectric plant at Parksville. This plant is located in Polk County 100 miles from Mascot, and a 66,000-volt transmission line connects the two places. The Zinc company has an emergency power plant consisting of a 1000-hp. steam turbine sufficient to carry the pumping load at any time the power is out of commission. The power plant for compressed air includes two Ingersoll-Rand 1600-cu. ft. per minute compressors and one Nordberg 3500-cu. ft. per minute compressor, all being direct-connected to synchronous motors. Typical Crew Table 1 shows distribution of the crew for a mine producing 1300 to 1350 tons per day. All loading and tramming is done by negro labor; drilling and miscellaneous work by native white labor. Table 1 Day Shift Night Shift Shift boss 1 1 Shoveler bosses 2 2 Machine men 18 16 Machine helpers 18 16 Blacksmiths 2 2 Shovelers 44 42 Chute pullers 6 6 Powdermen.. 4 Pipemen 4 Roofmen 5 Timbermen 2 Car repairmen 2 Tool boys 1 1 Cage men 1 1 Trackmen 4 2 Motormen 2 2 Motor couplers 2 2 Incline hoistermen 2 2 Incline couplers 4 4 Tipplemen 1 1 Skip loaders 2 2 Total 123 106 On a tons-per-man basis, the followin...
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