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Practical Mining; A Field Manual for Mining Engineers with Hints to Investors in Mining Properties

Practical Mining; A Field Manual for Mining Engineers with Hints to Investors in Mining Properties


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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. 1890 edition. Excerpt: ... try rock as ore mined. In such a case, the hand-sorting can be done in the mine, so that a car-load as it is brought out will contain nearly all ore or country rock. The same can be done when the vein is large, but the pay ore confined to a narrow and well-defined streak. FREE-MILLING AND REFRACTORY ORES COMBINED. The term "free-milling" is used in a commercial sense, for there is probably no case of an absolutely free-milling ore. The nearest approach to one with which the writer is acquainted is the Cable Goldmine, near Georgetown, Montana, in which even the iron pyrites associated with the ore does not contain gold except in the free state. More often, however, the sulphurets in free-milling gold rock will contain gold that is not free-milling. When they are in sufficient quantity and value, the mill tailings are concentrated, shipped to the nearest smelter, and sold. The consideration of free-milling and refractory silver ores combined is a subject of far more importance. In some mines the freemilling will be in excess, in others the refractory; often in the same mine we find a body of free-milling ore, and farther on a body of refractory. In general we find all gradations between the extremes, and it is often found necessary to determine which method will give the best commercial result; in this case also, when we find the profit to be about the same or but slightly in favor of the chlorination process, the preference should be given to the free-milling system, because it lessens the amount of the investment. Suppose, for example, that in a given case we find the gross value of the ore to be $30 per ton, and that we can save by free-milling 65 per cent and by chlorination 80 per cent. We shall have 65 per cent of $30 = $19 50 80" " "" = 24...


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Product Details
  • ISBN-13: 9781154567434
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 20
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1154567435
  • Publisher Date: 05 Jul 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 54 gr


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