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Wolframite-bearing quartz veins flanked by greisen alteration occur at and near the Black Pearl mine, Yavapai County, Arizona. The veins are genetically related to a small albitite stock, and cut a series of Proterozoic metasedimentary and intrusive rocks. The largest vein, the only one mined, is located at the apex of the stock. Field relations imply that this stock is a late-stage differentiate of the 1.4-Ga anorogenic Lawler Peak batholith, which crops out about 3 km to the south. Other, similar, albitites occur locally. Sharp contacts, relatively unaltered xenoliths, and uniform mineralogy indicate that the albitites are of igneous origin...

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