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Location: 95 km SE from Cuenca, Ecuador
Via al Valle del Quimi SN, three kilometers from the UPC of Tundayme, Zamora ChinchipeEcuador
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The host rock, alteration, and mineralization at the Mirador deposit are characteristic of a calc-alkaline porphyry copper system. Copper deposits of a similar style are widespread in the Cordilleras of North and South America. Most of the Mirador mineralization is exposed as weathered, leached laterite in the numerous drill trail and road exposures. Unevenly developed zones of supergene copper (and possibly silver) enrichment lie beneath a leached, lateritic “cap” with a relatively flat lower boundary. Thus this leached zone is thickest under ridge crests and nonexistent in any significant drainage bottom. Primary and supergene mineralization are only preserved in creek bottom outcrops, where the drainages have cut down through the overlying laterite.The copper-gold-silver mineralization of the Mirador deposit is present mostly as disseminations and fine fracture-fillings of chalcopyrite, secondary chalcocite, and pyrite. Gold occurs as fine inclusions in chalcopyrite and pyrite, as well as native. Molybdenite is present in systems of early-stage quartz veins that have a preferred east-west orientation. These veins occur as stockwork in both Zamora granite and early porphyry dikes.The sequence of mineral deposition at Mirador has been divided into early-stage molybdenum, early-stage copper ± gold, and late-stage copper-gold events, with a final weak polymetallic vein stage.
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