A Textbook of Assaying for the Use of Those Connected With Mines 8 1
A Textbook of Assaying for the Use of Those Connected With Mines 8 1
C Cornelius Beringer
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A rough test of the power of a cyanide liquor for dissolving gold may bemade by floating a gold leaf on its surface and noting the time requiredfor its solution. This test might, perhaps, be improved by taking, say, 20 c. C. Of the liquor and adding three or four gold leaves so that thegold shall always be in considerable excess. The liquor should not bediluted as this will affect the result. It should be allowed to standfor a definite time, say at least two or three hours, or better, thatcorre...sponding to the time the liquor is left in contact with the ore inactual practice. The liquor should then be filtered off and, with thewashings, be evaporated in a lead dish as in the assay of cyanideliquors for gold (p. 141). The gold obtained on cupelling, less any goldand silver originally present in the liquor, would be the measure of thegold dissolving power. THE ASSAY FOR CYANIDE BY TITRATION WITH SILVER NITRATE. The determination of the quantity of a cyanide is made by finding howmuch silver nitrate is required to convert the whole of the cyanide intopotassium silver cyanide[39] or one of the allied compounds.
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