Bonanza grade gold sample from the Trixie mine, Tintic district, Utah County. Native gold and green-blue tellurium minerals (including bright green xocomecatlite, a rare copper tellurate) are forming on bladed barite and cavity-filling quartz. Tintic is one of Utah's oldest mining districts and has produced significant silver, gold, lead, zinc, and copper. Photo courtesy of Tintic Consolidated Metals.