The yield reached its lowest point in 1899, but subsequently increased through the application of improved machinery, while the tailings of the old diggings were treated by the cyanide process with profitable results. [Please select]
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_--The tail-sluice is a large sluice made for rewashing the tailings or dirt which has previously passed through other sluices. [Please select]
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This separation of the pyrites from the pulverized rock is called "concentrating the tailings," and the material collected is called "concentrated tailings." [Please select]
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The arastra is sometimes used for amalgamating tailings which have passed through stamping-mills. [Please select]
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It is placed ordinarily in the bed of a ravine or creek through which tailings run, and it receives no attention for weeks or months at a time, save to keep it from choking. [Please select]
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The pulverized sulphurets are decomposed by exposure to the air, and after the tailings have been preserved for a time, they may pay better at the second amalgamation than at the first. [Please select]
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