Abstract
The Robinson Mining District of Nevada is a classic example of hydrothermal copper deposit in which the copper mineralization can be associated with hydrothermal alteration in the host rock. The average of six potassium-argon ages of primary minerals from the host intrusive and of two hydrothermal biotites agree within the analytical precision of the method. The data allow a maximum of about 2 m.y. for the interval between intrusion and sulfide mineralization for this deposit.
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