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. 1869 Excerpt: ...in the mercury troughs below the blanket tables, at the Port Phillip Company's works at Clunes, is interesting in a scientific as well as in a practical point of view. "No occurrence of this kind has been recorded in any work on metallurgy. Natural gold amalgam in small white grains, easily crumbling, has been found in ...
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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. 1869 Excerpt: ...in the mercury troughs below the blanket tables, at the Port Phillip Company's works at Clunes, is interesting in a scientific as well as in a practical point of view. "No occurrence of this kind has been recorded in any work on metallurgy. Natural gold amalgam in small white grains, easily crumbling, has been found in the platinum region of Columbia, the composition being--Mercury, 57-40; gold, 38-39; silver, 5 0. "There have been silver amalgam crystals produced at the smelting works of Joachimsthal, in Saxony; and according to Mr. Rosales, Wherle says, in his Metallurgy, that if the quicksilver of gold amalgam is very slowly evaporated, the gold will appear crystalline and in small crystals at the surface; but neither of these cases can compare in interest with the formation of the gold amalgam crystals at Clunes, which seem to have formed at the bottom of the mercury troughs, in the same way as any salt shoots out in crystals from its saturated solution in water. The formation of the Clunes crystals can only be viewed in this light. The extremely fine gold escaping from the blankets must have been dissolved in the quicksilver, as it would be in aqua regia. In course of time the quicksilver became thus more and more charged or saturated with gold, till a point, the limit of saturation, was reached, when probably, favored by the constant steady influx of the water and the vibration of the trough, caused by the concussion of the stamps, the process of crystallization commenced, and proceeded slower or quicker in proportion to the rate at which the gold was supplied from the blankets. Had the troughs remained eighteen instead of nine months undisturbed, the crystals, which now with few exceptions are very small, might have become much larger. With...
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