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That is cheaper than my guide... till you get to spill a 5-gallon bottle of gold chlorides with $12,000 worth of metal disolved in it...or when your hands become purple-stained or you get emphysema in your lungs from the fumes...or whatever...
For whatever is worth, I was manager of a Gold Refinery that used to process up to 2 tons per month fine gold, and the associated silver and PGMs that came with it. And really, the guide would need to be written, as I don't have it, except as a sketch, in my mind.
The profit is all in the buying-it-cheap, not in the refining of it. You can always send it to a refiner for processing.