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FIGURE 50. Inverted Morenci enrichment profile from Titley and Enders (1999). Panel
A shows an incomplete first cycle enrichment profile that leaves partially leached
hypogene mineralization above an immature enriched zone that still contains chalcopyrite
and grades into the middle and nascent blankets at depth. Panel B follows initial
extension and graben development where the base level initially drops and subsequently
recovers to some level above the first cycle enrichment blanket. Panel C shows the
second cycle enrichment blanket formed below the recovered water table that leaves a
thicker overlying leached capping. Continued base level drop as shown in Panel D
results in dissolution of the former enrichment blanket leaving a hematitic leached
capping and a thicker, higher-grade enrichment blanket with its own middle and nascent
zones that overlie the deeper, older first cycle profile.