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Gold is ¡°invisible¡± or refractory in many VMS deposits, especially in anomalous deposits (e.g., deposits of the Bathurst Mining Camp; McClenaghan et al. 2009). Most of the invisible gold is located in primary arsenian pyrite, arsenopyrite, and pyrite. Varying amounts
of primary invisible gold can be liberated to form native gold, electrum, and tellurides through zone refining and during regional metamorphic and tectonic events.
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