. The cyanide process; an introduction to the cyanide process, including the determination of the applicability of the process to an ore. mony, can be profitably treated by this admits of finer crushing, and requires less time ofcontact, than the ordinary percolation method. Theslimes are forced, by the compressed air, to the surface,leaving the coarser and heavier portions of the ore onthe filter, which facilitates the leaching. The Betty Cyanide Process.—This process effects theprecipitation of gold from weak solutions. The zincshavings are completely covered with a coat of leadby
. The cyanide process; an introduction to the cyanide process, including the determination of the applicability of the process to an ore. mony, can be profitably treated by this admits of finer crushing, and requires less time ofcontact, than the ordinary percolation method. Theslimes are forced, by the compressed air, to the surface,leaving the coarser and heavier portions of the ore onthe filter, which facilitates the leaching. The Betty Cyanide Process.—This process effects theprecipitation of gold from weak solutions. The zincshavings are completely covered with a coat of leadby being moved about in a 10% solution of lead the coating is complete, they are immediatelytransferred to the precipitation-tank, avoiding contactwith the air. The gold is precipitated on the lead ofthis lead-zinc couple. This lead-zinc loses its precipita-ting power in the first compartment after a ten daysrun, when it should be replaced by freshly prepared Short descriptions of some processes. 55 zinc, and used to precipitate gold from solutions strongerin precipitating-tank is 25 feet long, 6 feet wide,. Fig. 12.—Arrangement of Pneumatic Air-pipe, arranged abovefalse bottom of Leaching-tank. This illustrates the most simplepipe arrangement of the Pneumatic Process, but sometimes itis preferred to lead the main supply-pipe over the top of the Leach-ing-tanks, arrange the air-pipe in sections and connect same bydifferent drop-pipes. and 5 feet deep, divided into five compartments. Four-teen to fifteen tons of solution can be treated solution enters the precipitating-tank at the top. 56 THE CYANIDE PROCESS.
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