Orogenic gold formation and tectonic evolution of the Grass Valley gold district and temporal correlations of gold deposits in California

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Abstract
With a total past production of 13 Moz of lode gold, the Grass Valley gold district of the Sierra Nevada foothills province is the historically most productive lode gold source in California. Despite its economic importance, an understanding of the broad processes controlling the gold formation is lacking. Two distinct vein sets are present in Grass Valley: a north-trending set (N-S veins) hosted by the Grass Valley granodiorite and an east-trending set (E-W veins) hosted within mafic-ultramafic rocks. Questions of how these relate to each other and if they are products of the same event or ...
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