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Location: 22 km S from Tucson, Arizona, United States
4201 West Pima Mine RoadSahuaritaArizona, United States85629
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Asarco LLC includes the Mission, Ray and Silver Bell Arizona mines.
The Mission deposit is a porphyry copper skarn deposit located southwest of the city of Tucson in Pima County, Arizona. A series of Paleozoic sedimentary rocks.Mineralization is a skarn-related copper porphyry deposit with seams and disseminations of copper carbonates and sulfides with minor zinc, lead and molybdenum minerals in a pyrometasomatic deposit in altered, complexly folded, and faulted Paleozoic limestone and Triassic sedimentary and volcanic formations intruded by Laramide and Tertiary intrusives. There is a thin secondary enrichment zone. The host rock unit is the Scherrer Formation.A series of Paleozoic sedimentary rocks, dominated by carbonate, are folded, faulted, and fully inverted. These rocks have an overlying unconformable thick section of fine-grained Mesozoic clastic rock. A tabular body of laramide quartz monzonite porphyry invades the sedimentary sequence. Intrusion-related hydrothermal fluids alter and mineralize the host rock as well as the quartz monzonite porphyry. The result is a series of interbedded skarns and altered siliceous rocks with variable alteration and sulfide mineralogy, which are controlled by the original rock lithology.About 26 million years ago, the deposit moved laterally about 10.5 kilometers from the Twin Buttes area to its present location on a larger low-angle structure. As a consequence, the deposit partially eroded, failed, and was covered with 61 meters of alluvial soil.
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