Ask The Experts: Equipment to break up heavy clay
January 2017 by Chris Ralph
Q: I am looking for a “trommel machine” that doesn’t separate anything but clay slurry from rock hard clay.
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.
A Wilfley table works best when all of the mineral being run across it (the pulp) is about the same size. For this reason, I took a good look at each of the samples.
The technique I will describe is a much safer alternative and it works. It’s a fine-gold panning technique that eliminates the need for mercury amalgamation of most placer samples.
Breaking cemented gravels
It’s worthwhile for the prospector using a metal detector to know a little bit more about the association of iron and gold as well as how iron minerals affect your metal detector.
The ideal leaching chemical would leave behind what we don't want or need in the ore and take only the valuable metals.
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