This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1894 edition. Excerpt: ...pounds of ore. Even in this case, there was a strong excess of chlorine in the ore after the solution was complete, and the amount used could probably have been still further reduced without lowering the percentage extraction of gold. This ore contained 10 dwts. of gold to the ton, and over 80 per cent ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1894 edition. Excerpt: ...pounds of ore. Even in this case, there was a strong excess of chlorine in the ore after the solution was complete, and the amount used could probably have been still further reduced without lowering the percentage extraction of gold. This ore contained 10 dwts. of gold to the ton, and over 80 per cent. was extracted. This was an extreme case, and it is seldom that so little chlorine is sufficient. Mr. Butters states that at his mill at Kennel, California, where all descriptions of concentrates and Eng. and Mng. Journ., Dec. 20, 1890. pyrites were treated by the vat process, the average consumption of chlorine was 12 pounds per 2,1)00 pounds of ore. At Deloro, Canada, the amount used in the barrel process was from 12 to 18 pounds per 2,000 pounds of ore, but at the Haile Mine, South Carolina, only about 3 or 4 pounds per ton. In giving the amounts of chlorine which are used both in the vat and barrel processes, side by side, the intention is to show that the quantity absorbed depends on the nature of the material treated and not on the process used and the amount of water present, which are immaterial within certain limits as far as this point is concerned. Leaching the Charge.--When it is judged that the impregnation has lasted long enough for all the gold to be dissolved, the excess of chlorine gas is removed, the lid is taken off, and water is added to the charge to wash out the soluble chloride of gold. The water may be added from below, and is then either allowed to overflow at the top, or is subsequently drawn off again at the bottom, the inflow being suspended. It is far more usual, however, to pour on water at the top, and let it flow out at the bottom. The water must be added carefully, as otherwise the ore may pack unevenly, and...
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