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Ask the Experts
January 2015 by Chris Ralph
• How do I clean up gold encrusted with iron-sulfides?Volume is the Key to Success
While recovery rates are important, they must necessarily be secondary to the volume of material processed. Running more material at lower recovery rates is generally preferable to increasing the efficiency of the system.
What To Do When Gold Recovery and Assay Values Differ
Before going into an analysis of the ore composition, two other major factors will affect the result. These are the accuracy of the assay and the effectiveness of the mill for the gold recovery.
Ask the Experts
How do mines and refiners deal with doré bars?
Mining for Gold and Sapphires in Montana
Fascinated by the sapphires—and the gold that occured with them—he was soon buying parcels of property and setting up his own commercial-scale gravel processing plants.
A New Method for Handling Stubborn Gravity Middlings
The solution focused on the relative difference in malleability between gold and waste, rather than the difference in density exploited by gravity circuits.
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How do I set up a small placer operation?
Testing Ores for Free Gold
I get a number of questions from people about testing and treating hard rock ores. The simplest way, but also an expensive one, is to just have an assay test done by an independent assay firm. As an alternative...
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