Nacimiento Red Bed Copper South Branch Resources Property Picture


The Nacimiento property is a past-producing mine with an estimated 128 to 191 million pounds of copper resource in the ground; most of this mineralization occurs on the unpatented claims. Average grade of this material ranges from 0.5% to 0.7% copper. The deposit is a ‘redbed copper’ type occurring in the Agua Zarca sandstone member of the Triassic Chinle Formation. Copper occurs dominantly as chalcocite, which replaces carbonaceous material in permeable fluvial channels. Silver up to 11 ppm, and less common pyrite, chalcopyrite, and bornite are also present in the system. The oxidized zone contains copper oxides, including chrysocolla, malachite, and azurite.

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Nacimiento Executive Summary

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