Since acidity of the ore causes decomposition of the cyanide, an obvious method of reducing the loss is to add alkali in some form. Before
The ordinary gangue of most ores (silica and silicates of the alkalies and alkaline earths) exercises no direct influence on the cyanide solution. The carbonates
These methods are described here for convenience, as being more intelligible after the chemistry of the process has been discussed. The necessity of the presence
When the pyrites occur in tailings which have been subjected to the action of the weather for some time before treatment, compounds are formed which
It was generally believed at one time that the precipitation of gold and silver by zinc was effected by simple displacement, according to the equation:
The discovery that metallic gold is soluble in potassium cyanide came after studying the action of cyanides on plates of gold, and announced that they
Table of ContentsLeaching Gold in VatGold Lixiviation in VatPreparing the Ore for Vat CyanidationReprecipitation of Gold & Silver in the Leaching VatsVat SumpsVat Tailings Disposal Gold Leaching done in
Table of ContentsStrength of the Leach SolutionTesting Cyanide Solutions Strenght The cyanide is usually dissolved in a little water before being added to the stock
Table of ContentsDirect FusionRoasting followed by FusionAcid TreatmentThe method of cleaning-up as follows: Various gold bullion making methods have been suggested for effecting the elimination
There is one precipitation house and refinery common to all the leaching buildings. The method of precipitation is by zinc shavings, which, with slight modifications,