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Mining Magazine; Devoted to Mines, Mining Operations, Metallurgy & C (7)

Mining Magazine; Devoted to Mines, Mining Operations, Metallurgy & C (7)


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About the Book

Ce livre historique peut contenir de nombreuses coquilles et du texte manquant. Les acheteurs peuvent generalement telecharger une copie gratuite scannee du livre original (sans les coquilles) aupres de l'editeur. Non reference. Non illustre. 1856 edition. Extrait: ...in the shape of the rocker, which I have found by experiment to be a decided improvement upon the old form. The principle is to give a series of slight falls to the current of water into the basins or riflles, sufficient to produce a " boil" in the water; and also to expose the greatest possible surface of mercury to the passing sands. This latter is accomplished by making a " wallow," or slight depression between each riffle, and placing mercury within it, as well as in the riffles. The long space between the lowest and next riffle is left a dead level. I make the wallows between the riffles as shallow as possible, not exceeding at their maximum depth one fourth of an inch. It is better to make these wallows by rubbing down their beds with puinmice stone, or sand and stone, than to cut them with a sharp instrument; as by that process the wood obtains a somewhat rough and velvet-like surface, which has a tendency to catch and retain the fine particles of gold. The experience gained in deposit washing, of the point of deposition of the particles of gold, evinces that the bulk of such deposits do not occur, as would naturally be supposed at first thought, in the hollows and indentations into which the waters are rushed, but more frequently, upon, as it were, the very verge of the full which the waters make into such depressions. The quiet, still, unruffled, glassy flow of the water, just as it is precipitated over the edge of a rapid descent, appears to be peculiarly adapted to the deposit of the gold, for it is on such situations that the richest washings are the most frequently found. In the gentle rise of the wallow, therefore, as the edge of the riffle is approached, will be discovered...


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Product Details
  • ISBN-13: 9781154215144
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 264
  • Spine Width: 14 mm
  • Width: 189 mm
  • ISBN-10: 1154215148
  • Publisher Date: 01 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 476 gr


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Mining Magazine; Devoted to Mines, Mining Operations, Metallurgy & C (7)
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