In 1995, the Magma Copper Company discovered a porphyry copper deposit beneath thick postmineral cover 2 km south of the historic Magma mine in Superior, Arizona. Since that time drilling has delineated a large, high-grade, hypogene copper-molybdenum deposit, now named the Resolution deposit, with an inferred resource of 1,624 million metric tons (Mt) at 1.47% Cu and 0.037% Mo.
Hehnke, C., G. Ballantyne, H. Martin, W. Hart, A. Schwarz, and H. Stein. 2012. Geology and exploration progress at the Resolution porphyry Cu-Mo deposit, Arizona. Society of Economic Geologists, Inc.(Special Publication 16):147-166.
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