File:Transactions (1871) (14597437817).jpg

Identifier: transactionsmining60amer (find matches)
Title: Transactions
Year: 1871 (1870s)
Authors: American Institute of Mining, Metallurgical, and Petroleum Engineers
Subjects: Mineral industries
Publisher: New York (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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dge travels a trolley carrying a walking beam, bucket leg, andbucket of 12 T. capacity. The unloader has a rated capacity of 500 T,per hr. and will generally excavate a tank of tailings in 10 to 11 hr. Anengineer and an oiler are required to operate it. A description of thismachine has been written by Franklin Moeller, Engineer for the Well-man-Seaver-Morgan Co.^ Two eight-car trains are released from themine service at 4.30 p. m. for the transportation of tailings. Twenty-oneto twenty-three train loads of eight cars each are required to excavate atank. The tailings are taken to a dumping ground located about a milefrom the plant. The dump is on gently sloping ground with a uniformgrade of 1 per cent., the end of the present dump being about 80 ft. (24.3m.) above the original ground. Solution The acid advance during the first year has varied from 869 to 1324gal. (3289 to 5011 1.) per min. While we found that the more rapid » Trans. (1919) 61. HENRY A. TOBELMANN AND JAMES A. POTTER 35
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r « o f=H 36 FIRST YEAR OF LEACHING BY THE NEW CORNELIA COPPER CO. advance appeared to give better extractions, we also found that the acidconsumption was greatly increased. It is of interest to note that theper cent, of free acid coming off the newest charge averaged practicallythe same for an advance of 869 gal. per min. as for an advance of 1324gal. per min. To show the normal decrease in acid and increase in copperand other constituents in the solution advance in one passage throughthe leaching tanks, the average analyses for the month of March, 1918,are given in Table 6. Table 6.—Analyses of Solution for March, 1918 Free sulfuric acid, per cent 3.00 0.48 Copper, per cent 2. 38 3. 04 Iron as ferrous iron, per cent 1. 57 1.61 Iron as ferric iron, per cent 0.69 0.72 Alumina, per cent 2. 53 2. 60 Specific gravity ■ 1. 290 1. 305 There were originally some 13,000,000 T. of thoroughly oxidized ore,consisting principally of malachite together with small amounts of cupriteand chryso

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