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Transactions of the American Institute of Mining Engineers Volume 29

Transactions of the American Institute of Mining Engineers Volume 29


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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. 1900 Excerpt: ...is crushed upon a grinding-plate to pass roughly a 20-mesh sieve, and again passed through the sampler, set to take 10 per cent of the total. The residual sample is then crushed to pass a 100-mesh screen, after which, by means of a small Clarkson sampler, specially arranged, the sample is divided into four parts. Of the four packets thus made, one is assayed on account of the seller, one by the works, one sealed by both parties for reference, and one is left for possible need. Should the difference in any assays between the works and the seller amount to more than $3.50 per ton on an ore assaying $28.50, or to more that $7.00 per ton above that assay, the third packet is assayed, either by a third party or by the two assayers together; their united result being final. Smaller differences than these are divided. All assays are made in crucibles. Two 25-gramme lots of the ore are fluxed with, roughly, litharge 30 grammes; soda bicarbonate 45 grammes; dried borax 25 grammes, and flour 1 gramme; these proportions being varied slightly, according to the ore. The same crucibles serve for from six to ten charges. All accounts, weights and assays are upon the metric system. The assays are reported as so many hundred thousandth parts den milesimos) for gold and ten thousandth parts diez milesimos) for silver. Ores are purchased upon their fine contents of the precious metal in kilos, higher prices being paid per kilo of metal contained for higher assays, since it is contained in less weight of ore. Thus, with an ore assaying two eien milesimos (the lowest bought) 50,000 kilos or 50 metrical tons are required to contain 1 kilo of gold. One cien milesimo equals $7,083 American gold per ton of 2000 pounds. Milling. As the lots are settled for, they are conveyed by tip-...


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Product Details
  • ISBN-13: 9781236215925
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 368
  • Spine Width: 19 mm
  • Width: 189 mm
  • ISBN-10: 1236215923
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 658 gr


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