Cayuga Mine, Copper Mountain District (Clifton-Morenci District), Shannon Mts, Greenlee Co., Arizona, USA
A former underground Cu-Zn mine located in the N½SE¼S½NE¼ sec. 18, T4S, R29E, adjacent to the Dover Copper group, and the Gold Belt property (presently Phelps Dodge Corp. holdings), on the ridge E of Pinkard Gulch & W of Copper Mountain, 2.5 miles WNW of Morenci, on private land.
Mineralization involves NE-trending fisures in sedimentary sequences with contact metamorphic replacements along the margin of porphyry intrusions. The vein accompanies the Cayuga Fault (a major regional fault). Ore concentration was supergene enrichment along well-defined fissures. Alteration is a contact metamorphic zone between limestones and porphyry, associated with a hardening of sedimentary layers and substantial development of epidote and magnetite. The ore zone strikes E-W and dips 55S.
Area structures include an EW-trending fissure vein with well-defined footwall of quartzite and a hanging wall of limestone. NE-trending granite porphyry dikes are present. Alternating sandstone and shale beds form irregular areas almost entirely surrounded by Morenci Granite Porphyry. Fissure vein might be a continuation of the Soto Fault and vein system to the west. Porphyry in this region tends to form intrusive sheets between the sediments which dip 10-30 SW. Regional faulting prior to intrusion and mineralization. Longfellow Limestones are extensively exposed in this region.
Tectonic components are the Cayuga Fault; heavy beds of quartzite are upthrown on the north side of the Cayuga fault and connect with the Great Quartzite Block of the Coronado Ridge.
ReferencesLindgren W. (1905) The Copper Deposits of the Clifton-Morenci District, Arizona. USGS Professional Paper 43: 297-298.
Bennett (1975) Geology and Origin of the Breccias in the Morenci-Metcalf District, Greenlee County, Arizona, MS thesis, University of Arizona, 153 pp.
U.S. Bureau of Land Management Mining District Sheet #840.
MRDS database Dep. ID #10048288, MRDS ID #M800417.
7 entries listed. 6 valid minerals.
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