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OpenStudy (anonymous):
how is gold produced in nature?
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OpenStudy (zale101):
The primary source of gold is igneous rocks or surface concentration. A deposit usually needs some form of secondary enrichment to form an economically viable ore deposit: either chemical or physical processes like erosion or more generally metamorphism, which concentrates the gold in sulfide minerals or quartz. http://en.wikipedia.org/wiki/Gold
OpenStudy (nincompoop):
I think the question begs another question.
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