Abstract

The Copper Creek area is in eastern Final County, Arizona. Cretaceous (?) sediments, interbedded with a complex series of andesitic volcanic rocks are intruded by granodiorite and overlain by basaltic lava flows.Faulting is prominent and of two ages. The first preceded, and in part, controlled the granodiorite intrusion, and the second followed its consolidation. The many breccia pipes that stud the area are in strong fault zones or at intersections of faults. The pipes are believed to be the result of solutions acting on fractured areas. The advanced stage is complete silicification of parts of the breccia.Between 1863 and 1939, metals, of which molybdenite is the most important, valued at approximately $3,500,000 have been recovered. The Childs-Aldwinkle mine, the largest producer, is a pipe deposit with the molybdenum and copper sulphides in the spaces between granodiorite breccia fragments, and generally replacing earlier gangue minerals. Molybdenite, in the Childs-Aldwinkle mine is the latest hypogene sulphide. The deposit is considered to be in the mesothermal temperature range. Other pipes have yielded copper ore.

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