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Tin mineralization in the Black Range is present in a series of Oligocene rhyolite domes that cover an area of approximately 200 km2 in southwestern New Mexico. These rhyolites are typically high silica (76 to 78 percent), peraluminous, and topaz bearing. The δ 18O values (~7.0 ‰) of unaltered rocks are typical of normal I-type granites.

Locally along dome margins, the glassy groundmass of the rhyolite is pervasively altered to smectite, although sanidine phenocrysts are usually fresh, even in contact with tin-bearing veinlets. Tin occurs (1) rarely as cassiterite in miarolitic cavities near tin-bearing veinlets, (2) within altered...

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