Bromine Cyanide Gold Leaching: Cyanogen Bromide
Although the bromo-cyanide or Diehl process for the extraction of gold from its ores is used on several of the Kalgoorlie mines, very little information has been published on the original process, and no details are available from the various mines now using it. The following description of the process as carried on at the […]
Base Metal Deposits
Some epithermal veins, worked for gold in the upper, enriched zones, consist mainly of base-metal minerals below the enriched zone. The Smuggler vein at Telluride, Colorado, as shown by Lindgren, is an outstanding example. Its sulphides constitute 2 or 3 per cent of the vein and include principally pyrite, galena, zinc blende, and chalcopyrite accompanied […]
Gold Ore Deposits
The volcanic source of gold deposits is also most clearly indicated in the Cripple Creek district, Colorado, where the deposits of commercial grade are either within a complex volcanic neck or extend for only short distances into the surrounding rocks. It is true that similar mineralization has taken place for considerable distances from the neck, […]
Hydraulic Sluicing
Supposing that a claim is suitable for hydraulic sluicing, the first thing to do would be to ascertain what is the probable volume and pressure of the water supply. This can be closely approximated by means of an aneroid survey. The facilities for the disposal of the tailings should next be ascertained. As mentioned before, […]
Refining Gold: Remove Zinc by Distillation
It seems desirable to remove zinc more completely than can be done by acid-treatment, and also to obtain it in a form at once available for precipitation again. I feel safe in saying that from 40 to 50 per cent, of the zinc originally used for precipitation could be thus recovered. Philip Argall says, in […]
Prospecting Dredge California
In considering the prospective value of dredging ground there are many conditions to be taken into account besides its actual gold content; it is like all other classes of mines in this respect. As a prominent mining engineer recently said: ‘‘Each mine is a law unto itself.” Likewise each dredging scheme must be considered strictly […]
Gold Dredging
The working of gold alluvial deposits by dredging has from all times been a popular form of mining, not only from the simplicity of its operations, but also, in its more primitive stages, from the possibility of carrying it on without large capital, without skilled labour, expensive plant, long terms of preparatory work, or, in fact, any […]
Quicksilver Deposits
Quicksilver deposits are of special interest because they are confined to shallow depths and their origin is comparatively clear. The absence or scarcity of cinnabar and the less common quicksilver minerals in deposits whose features point to deposition at high temperature implies that these minerals are not stable at such temperatures, and the fact that […]
Wooden Ball Mill
Wills’ Mineral Processing Technology
JOIN 911Metallurgist Discussion Forums to get a chance at winning to get a free (my used) copy of: Wills’ Mineral Processing Technology (Seventh Edition) Barry A. Wills and Tim Napier-Munn An Introduction to the Practical Aspects of Ore Treatment and Mineral Recovery I will select a winner from User Directory on March 1st 2017 and announce the winner […]