Pyrrhotite appears to be in equilibrium with pyrite, is hexagonal, and is relatively pure; frequency distribution for equilibrium temperatures, determined from Arnold's curve, has a maximum at 495 degrees C. At this temperature, the partial pressures of oxygen and sulfur in equilibrium with pyrrhotite-pyrite-magnetite would be about 10 (super -20) and 10 (super -5) atm., respectively. Closed-system behavior in the orebody is attributed to buffering action of the pyrrhotite-pyrite-magnetite assemblage.

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