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Mines and Methods Volume 1, No. 2

Mines and Methods Volume 1, No. 2


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About the Book

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. 1909 Excerpt: ...soda gave a better extraction. Upon investigating this subject about two years ago it was found that, in spite of the statements of the early Precipitatlon Room, tice differs from that at the Homestake mill, at Lead, South Dakota, and at other mills where Mr. Merril's system of zincdust precipitation is used. At the Golden Gate mill the gold solution is pumped into steel tanks about 20 ft. in diameter by 8 ft. deep. Zinc dust is added while the tank is being filled and during this time the zinc dust is kept in violent agitation by means of a rotating sprinkler arrangement, at the bottom of the tank, from which compressed air escapes. As soon as the tank is filled, it is allowed to settle so that the zinc dust will go with the first solution to the filter-presses. Then, after the zinc dust has settled, the solution and zinc powder is run to the filter-presses. There are ten Johnson filter-presses; one press has 42 plates, while the rest have 36, each 21 in. square, inside measurement. These presses are cleaned cnce a month. About one-third of the gold is precipitated by the zinc dust during agitation in the tanks and the rest in the press as the solution works its way through the zinc dust. The precipitation is excellent as the tail solution rarely assays more than 5c. a ton in gold. About a year ago the company experimented with a box and zinc shavings for precipitating the solution, but after considerable experimenting it was decided that the saving in cost with zinc boxe3 was not enough to pay for a change. The consumption of chemicals is shown in an accompanying table, while another table shows the cost of mining and milling, the Golden Gate Mill looks low for a gold ore, but the complex nature of the Mercur ore accounts for it. The company refines its o...


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Product Details
  • ISBN-13: 9781232333364
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 46
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1232333360
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 100 gr


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