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Occurrence of Native Gold
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action added admixed alkaline allowed alloy amalgam ammonium chloride anode antimony arsenic assayed base bullion base metals boiled borax bullion button calcium carbonate cathode cent clay compounds containing cooling copper crucible crystals cupel cyanide decanted decomposed dilute sulphuric acid dissolved dried dull red evolved filter finely divided fireclay fluxes furnace fusion gold and silver gold-silver grains grammes granulated hydrochloric acid impurities inches insoluble iron lead litharge mass material matte melted mercury Metallurgy method Mining molten metal nitrate nitre cake nitric acid obtained operation oxide oxygen pass into solution phate phosphoric acid pink powder pipe plates platinum porcelain poured precipitated present pyrosulphate quantity readily red heat Refining remains removed retorted gold salts separate silica silver chloride silver sulphate slag slimes small amount smelted soda soluble strong sulphuric acid sulphate of silver sulphide sulphuric acid tellurium treatment vessel washed with water weight zinc boxes