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Census Reports Tenth Census. June 1, 1880 Volume 13

Census Reports Tenth Census. June 1, 1880 Volume 13


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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. 1885 Excerpt: ...car. When the ore of a mine is treated by a custowi mill ore samples are often taken by the mine owners as a check upon the working of the mill. Battery Samples.--Battery samples are always taken at the mill, and in wet-crushing generally in the following manner? Every half hour or hour a rectangular iron box, or dipper, is passed along uudei the lips of the mortar where the pulp falls into the sluices, and a portion of the slimes and sand is taken, care bei ng observed to prevent concentration by the overflowing of the box. This sample is put in a bucket with others, and at tbe end of twenty-four hours the clear water is poured off and the collective samples for the day are dried find prepared for assay. i In tlry-cru8liiug mills it is usual to take the sample by passing a box along the lower part of the screen every hour or so. Sometimes the sample is taken from the conveyor or from the pulp in the bins. Tailings Samples.--Tailings samples are taken from one 01 all of the discharge plugs of the settler or are dipped from the top before each plug is drawn. A very good way is to dip a small gas-pipe iuto the settler close to the top, one end of the pipe being closed with the finger, and withdraw a portion of the pulp. Bullion Samples.--Silver bullion is sampled by taking a dip from the melted mass after stirring, or a little is poured into water while the crucible is still nearly full, and a little more when it is nearly empty. Either method is good. Gold bullion is sampled by chipjting two diagonally opposite corners of the bar after it is cast. Ore Assays.--Ore assays are generally made in crucibles, though with very base ores scorifiers are sometimes used. They are seldom corrected for loss in assaying. f ROASTING FURNACES. Systems Of Fubnaoes.--There ar...


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Product Details
  • ISBN-13: 9781231735350
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 312
  • Spine Width: 17 mm
  • Width: 189 mm
  • ISBN-10: 123173535X
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 558 gr


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