Ac cording to Molengraaff it includes the two following series: - An upper group including the auriferous conglomerates of the Rand: Witwatersrand Series.
One process depends upon the fact that, with a suitable current density, if a very dilute solution of silver nitrate be electrolysed between an auriferous silver anode and a silver cathode, the silver of the anode is dissolved out and deposited at the cathode, the gold remaining at the anode.
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