Processing Gold Ore by Flotation
APPLICATION OF FLOTATION TO GOLD ORE A flotation plant is being erected at the Falcon mine, Rhodesia, to treat ore containing gold and copper. With the exception of the Mt. Morgan, the Etheridge, and the Great Fitzroy mines, Queensland, I have not heard of the flotation process being used successfully to treat ore containing an […]
Gold Concentrate Melting Furnace
Free Milling Gold Ores
Many problems on free milling gold ores have been solved by the 911MPE Testing Laboratory. One free milling gold ore received for testing the application of the Mineral Jig in the Ball Mill Classifier circuit gave the following results: Head Ore, 0.65 oz. Gold per ton (Assayed) 0.643 oz. Gold per ton (Calculated) Amalgam from Amalgamation […]
Cyanide Diffusion pH and Oxygen
Whether lime titrations or pH control is belter depends, I think, on the level of control. If the level was down around 0. 1 lb per ton of solution, titration is a bit difficult without a highly skilled man, which is not always available. Around a pH of 11 or 11.5, a pH meter is […]
Gold: Dig it & Vault it!
Gold, we take it out of One Hole to Put it into Another.
Effect of Oxygen on Gold Leaching
In simplified terms, the Effect of Oxygen on Gold Leaching can be summarized in saying: The dissolution rate of gold in alkaline cyanide solutions under atmospheric conditions, and at practical cyanide levels, is directly proportional to the dissolved oxygen concentration. The rate of dissolution of gold in alkaline cyanide solution is dependent on a number of […]
Gravity Borax Method GBM Mercury Free Gold Recovery
The Gravity-Borax Method GBM is still unknown to most Artisanal and small-scale gold miners (ASGMs) worldwide as most still use mercury to extract gold. “Whole-ore amalgamation” is a technique that requires the use of 10–25 g of mercury to produce 1 g of gold. Within the last eight years, it has become evident that this technique is more […]
How To Use Mercury To Recover Gold
Forever and ever, mercury has been used to recover gold, fine gold in particular. When it comes to chemicals like Hg, one must be careful. THE DANGERS OF MERCURY AND NITRIC ACID Mercury and nitric acid can kill if swallowed. Nitric acid can be absorbed through the skin, causing nitric acid poisoning. WEAR RUBBER GLOVES! […]
Separating Gold And Silver Dore Bars With Nitric Acid
A dore bar is the metal that comes from the slag that has been fired and cooled. Place dore bar into a crucible. Fire in a furnace or oven. When using a muffle furnace, fire on high. It is ready when the metal is melted and looks like honey with no lumps in it. Pour […]
How To Use Aqua Regia To Purify Gold
THE DANGERS OF AQUA REGIA: When adding aqua regia to ore, there can be use a red gas given off; THIS RED GAS CAN KILL Sometimes the ore will bubble over, so watch it carefully. Use the aqua regia in an open area and it to the ore very slowly. Aqua regia cannot be boiled […]