Abstract
Hundreds of solution-collapse breccia pipes crop out in northern Arizona. High-grade U ore, and potentially economic concentrations of Ag, Co, Cu, Ni, Pb, and Zn in some pipes, has stimulated mining activity there. More than 900 confirmed and suspected breccia pipes have been mapped by this study. One pipe was chosen for exploration drilling 1984 because it exhibited all preestablished exploration criteria. Five rotary and core holes were drilled into this pipe; they contained mineralized breccia and zones of U-, Cu-, and Ni-mineralized rock.
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