Zinc Cyanide Plating Process
In order to secure definite information regarding the best conditions of operation of plating solutions, it is necessary first to obtain reliable methods for preparing and analyzing solutions of any given composition. This need has been especially felt in connection with such mixtures as the zinc cyanide plating solutions in which, as will be explained […]
Treatment of Mixed Sulfide Oxide Ores of Copper
Many of our largest copper deposits contain both sulfide and oxidized copper minerals. The large porphyry mines, with a total copper content of from 1.3 to 2.0 per cent., send to their mills ore with an oxide content of from 0.2 to 0.4 per cent. While the recoveries of the sulfide minerals are considered satisfactory, […]
The Mathematics of Gravity Concentration
The rapid and comparatively recent development of flotation has opened so fascinating a field for study and research that the older processes of gravity concentration no longer receive the attention they deserve. The early work of Munroe and Richards, and the more recent contributions by Clevenger and Coe, Laist and Wiggin, Ammon, Bardwell, Crowfoot, and […]
Table of Apparent Geological Dips Calculated Chart
The form of dip chart here presented for the use of the profession was devised by the author when he was confronted with a particularly heavy job of geological section making and did not have any of the usual tables or charts at hand. This was at the property of the Teziutlan Copper Co. in […]
Cyanide Poisoning Antidote
In 1910, the Committee of the Chemical, Metallurgical and Mining Society of South Africa, appointed to investigate cyanide poisoning, recommend as an antidote to Cyanide Poisoning the following: Thirty cc of a 23 per cent, solution of ferrous sulphate. Thirty cc of a 5 per cent, solution of caustic potash. Two grams of powdered oxide of […]
Agitated Cyanide Gold Leaching Test
In the old days laboratory tests were usually made by mechanically shaking up in a bottle for a given time a charge of ore and cyanide solution. The most generally convenient device for this purpose is a wheel, to which are attached boxes, each capable of containing a standard acid bottle, and with means for […]
Cleaning & Melting Gold Precipitate
With zinc shaving precipitation the usual method of cleanup is to shut off the flow of solution and starting at the head compartment of a box to wash the shavings gently in the solution avoiding any action that would tend to break up the attenuated threads into short pieces. The zinc is then removed and […]
Gold Precipitation
Whatever method of gold precipitation be used it is of great importance that the solution should be absolutely clear and free from suspended matter, and in practice it is almost impossible to obtain solution from slime treatment, either by decantation or by means of the various types of slime filter, that is sufficiently clean to […]
Sulphide concentrate leaching
The question as to whether concentration shall be included in the treatment of a given ore will often depend on the possibility or otherwise of recovering the precious metals from the concentrate at the mine. It may be suggested that if the concentrate can be cyanided after being separated from the gangue, why can it not […]
Gold Metallurgy Accounting
Everyone connected with cyanide plants has at some time or another been confronted with a real or apparent shortage of bullion in the clean-up, that is, the bullion recovered has been less than the amount expected when calculated from the assays of head and tail and the tonnage treated. Such a shortage will often occur […]