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The initial source for copper in Arizona were igneous intrusions into native host rock. The copper veins were eventually exposed through erosion at the surface. Copper then leached back into the ground and recrystallized in the form of copper minerals in what is called a supergene enrichment zone. The igneous intrusions were due to a long period of magmatism from the middle of the Mesozoic to the early Cenozoic era.

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