Gold Assay Methods
Listed and explained in details below are 8 Gold Assay Methods which are alternatives to the classic fire assay method. Amalgamation Assay This is useful in determining the amount of gold present in the ore capable of being extracted by mercury. The sample of ore is pulverised fine enough to pass through a 60- or 80-mesh […]
How to Detect Gold in Minerals
How to detect gold in loose alluvial ground has been already described. A similar method may be employed in the case of auriferous quartz after grinding it. If the concentrates obtained in either case contain sulphides, these are collected, roasted or treated by nitric acid and re-ground. The light particles of oxide of iron can now […]
Scorification Assay
As stated above, the Scorification Assay process is especially applicable to (a) complex ores, (b) very rich ores, (c) ores which are mainly valuable for their silver contents. The losses are small and the operations are easy to conduct, and need not be varied much for different classes of ore. For these reasons the process […]
Sample Preparation for Fire Assay
The value of an assay depends largely on the care with which a sample of the ore is selected. Sampling should be, as far as possible, automatic, and independent of the will or judgment of the assayer. The sampling of ore in place in mines is described in books on mining. The taking of running […]
Cupellation Furnaces for Precious Metal Assaying
Cupellation is conducted in a muffle furnace, the construction of which is shown in Figs. 62-63. The fire is lighted, a little bone-ash is sprinkled on the floor of the muffle to prevent its corrosion by litharge in case of the upsetting of a cupel, and the cupels introduced as soon as a bright red […]
Precious Metals Refinery Security
“Highgrading” a polite word for stealing gold and silver for your refinery, has been a way of life since the metals in native form have been mined or produced. Unfortunately, in the past, highgraders were not always severely prosecuted or even looked upon unfavorably in their communities. Recent high metal prices with attendant world wide […]
How Much do Steel Grinding Balls Weigh
Complex Lead – Zinc Separation by Flotation Process
Merrill Crowe Leach Solution Sampler
This keeps the leach sample secure prior to its assaying. A simple electric box, lock and key, piece of pipe, funnel, bottle and yes, some wire.
Best Recovery of Gold by Size: Fine to Coarse Particles
Many types of efficient placer gold recovery equipment are available today. The choices facing those designing a recovery system for a particular site are not easily made. A major consideration, of course, is cost versus recovery, but other factors must also be considered when designing an effective system. The size distribution of the gold is […]