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No need to dig too deep to find gold!

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Why are some porphyry deposits rich in copper while others contain gold? A researcher investigated how the metals are accumulated over the time duration of a mineralizing event and discover that the depth of the deposits influences the quantity of metals produced and that over 95% of the gold is lost to the atmosphere. The deeper a deposit is, the more copper there will be, while gold-rich deposits are closer to the surface.

Source: ScienceDaily.com