Roasting of Gold And Silver Ores And the Extraction of Their Respective Metals

G Guido Kstel

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However, when once at work, it is always better to do the roasting properly; but it is not necessary to sift the ore after roasting in order to separate the lumps from the mass, as is done with the barrel amalgamation, except to prevent nails from coming into the pan. The formation of such lumps, however, must be avoided as much as possible. Imperfect roasting in the presence of base metals, gives in pans always a low fineness of bullion.
Examples of Local and Different Roast- ings.
27. Boastin...g of Silver Ores in Freiberg (Saxony) . The amalgamation process, and consequently this kind of roasting, was given up long ago at Frei- berg ; but the method of roasting as performed 4:0 ROASTING OF ORES.
there is nevertheless very interesting. The ore subjected to roasting consisted of silver glance, brittle silver ore, ruby silver, metallic silver, fahl ore, bournonite, zincblende, sulphide of anti- mony, iron, copper, and nickel pyrites, and of gangue, viz: quartz, calc, brown, heavy, and fluor spar.

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