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Home > Art, Film & Photography > The Practical Miner's Guide; A Treatise on Mine Engineering
The Practical Miner's Guide; A Treatise on Mine Engineering

The Practical Miner's Guide; A Treatise on Mine Engineering


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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. 1860 Excerpt: ...The test should be put in the fire an hour or more before the refining process is begun, otherwise the silver will be apt to be agitated by the unsettled test, spring over, and consequently the assay be destroyed. Should the assay set in refining before it has become pure, throw in about half an ounce of potter's lead. If the fire is permitted to get low, or too much air admitted into the furnace, the assay will be apt to turn to litharge; whenever this happens, increase the fire by putting in a few pieces of sea-coal instead of coke, at the same time sprinkle a little coaldust on the test. When the assay is thoroughly pure or fine it will assume a globular shape, set, or become fixed, and in a few moments will throw up sprouts or branches from the top. Take out the test, weigh the prillion, find in the table the produce or value per ton, and the work will be complete. The fire should he gradually increased toward the close of the process. A muffle or arched cover to the test would prevent the air from taking an unfavorahle effect on the assay, while the furnace is opened for the purpose of increasing the fire, by adding coal, wood, or coke. ASSAY OF COPPER ORE. Sample--400 grains pounded well in a mortar and sifted through a fine hair sieve, put in an earthen crucible, and frequently stirred while in the furnace with an iron rod or paddle. The sulphur will be seen to go off in white fumes; the process must be continued until this evaporation ceases, or nearly so, which will generally occupy from one to two hours. Great attention must be paid during this operation in order that a standard regal may be obtained, which being done, there will be no danger of producing a true assay. The ore during the process, must be kept in a free, sandy state, which will be ...


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Product Details
  • ISBN-13: 9781159331221
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 46
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1159331227
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 100 gr


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