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Losses in Gold Amalgamation; With Notes on the Concentration of Gold and Silver Ores (with Six Plates.)

Losses in Gold Amalgamation; With Notes on the Concentration of Gold and Silver Ores (with Six Plates.)


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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. 1890. Excerpt: ... DOUBLE CONCENTRATION. There are ores, of both gold and silver, in which the sulphurets are so rich that even a very small loss by weight involves a large loss in assay of the precious metals. Such minerals as tellurides of gold and silver, ruby and brittle silver ore, come under this head. In concentrating the tellurium ores of Colorado, some of the very finest slime mineral overflowing from the concentration tanks of the Frue vanners assayed as high as 5000/. per ton in gold and silver. It is obvious that when very rich mineral exists in the ore, extra care and expense in close concentration are necessary. When panning tests on the concentrator tailings show a distinct head of fine mineral, closer concentration can still be done, if this fine mineral be rich enough to pay for it. It will be found that such fine mineral is really no finer or more difficult to save than much of that already caught in the concentration tank; its loss is not wholly necessary. It has escaped contact with the belt surface, in the same way as fine gold will escape in part from a short copper table, but be saved in running over a longer one, having more chances of contact in the greater distance. In some cases attempts at concentration of this mineral from the tailings of the first concentrator have failed, for the reason that one vanner placed below another does not have a good chance, owing to excess of water introduced by the clear water distributor of the first machine. This difficulty can be overcome in several ways, and a consideration of the following suggestions may lead to a more perfect result on many ores now subject to considerable loss in the concentration. The first and natural course to overcome the crowding of the second vanner is to split the tailings of the upp...


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Product Details
  • ISBN-13: 9781459041332
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 34
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 145904133X
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 82 gr


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Losses in Gold Amalgamation; With Notes on the Concentration of Gold and Silver Ores (with Six Plates.)
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