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Increase the value of gold bearing rocks

Cocacola or vinegar, will remove calcite and reveal gold.
This will take 1 or more days.

This may be more worthwhile than crushing it, as you can sell a beautiful piece for a much higher price than you’d get for the gold (especially accounting for crush-extract-refine work).

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A grand suggestion and well worth while as a gold specimen is worth much more than the gold content.

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Those rocks are from Canada, I’ve seen it also done to Colorado gold.
Not sure if we have the same types here.