How to extract Gold, Platinum, Rhodium from “Black Sand” ore concentrate?
I have access to a large amount of “Black Sand’ ore concentrate, which has assays showing extremely large concentrations of Gold, Platinum and Rhodium. But many people say it is worthless because it is “impossible” to extract the precious metals from the junk (especially Iron).
Can the precious metals be extracted at all?
If they can be extracted, can it be done profitably?
What do you mean by a large quantity? 1 kg, 1 tonne, 1 million tonnes?
In the mining business, we usaully don’t look at anything unless there’s at least 10 million tons, but for an indvidual hobbyist a few kilo’s could be interesting.
If the gold and platinum are “free” (IE, not tied up with refractory minerals like arsenopyrite), by far the simplest way to separate gold and platinum from black sand is by gravity. There are many types of sluice boxes and spiral jigs commercially available, or you can build your own. Or you can use a shaker table. These methods all work becasue the gold and platinum are heavier then the black sand which is essentially magnetite.
You can also separate gold with cyanide leaching, with or without roasting. This is complex and beyond the abilities of a hobbyist.
Profit will depend on amount, grade, grain size, mineralogy, metallurgy, energy costs, environmental considerations, and many other factors.
To have native rhodium in black sand would be highly unusual.
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