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PLATE 52. Geologic map and sections of the San Carlos Indian Reservation. 53. Index map of the San Carlos Indian Reservation showing mineral localities. 54. Geologic map and section of the Copper King-Wylomene copper area.

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An infrared photograph of southeastern Arizona, taken during the Apollo 9 multispectral terrain photography experiment in 1969, reveals a ringlike feature, some 3-4 miles (5-6 km) in diameter, on the Natanes Plateau, 35 miles (56 km) north of the town of Safford. Because the feature occurs in an area of nearly flat lying Tertiary volcanic rocks, the possibilities of its being a small collapse caldera or an exposed circular intrusive body vere considered. Geological and geophysical studies of the area were made to test these hypotheses. GEOLOGIC INVESTIGATION

Bureau of Mines during 1973 and 1974 covered 53 square miles (137 kin 2) in the rugged central Wasatch Range near Salt Lake City, Utah. The study by the U.S. Geological Survey consisted of geological, geochemical, and geophysical investigations; the study by the U.S. Bureau of Mines covered a search of public records for mining-claim locations and the mapping, sampling, and examining of prospect workings and mineralized areas. The area lies at the west end of an east-northeast alinement of mid-Tertiary intrusive rocks that define a mineral belt containing silver-lead-zinc deposits. The highly productive Park City district and the Cottonwood-American Forks districts are within the belt to the northeast of the study area. Mineral commodities in the area include molybdenum, silver, lead, tungsten, zinc, and copper. Part of the area may have a future potential for minable deposits containing molybdenum but little economic potential for other metals. The area has little or no potential for coal, oil, gas, and geothermal resources. The Lone Peak area is underlain chiefly by Precambrian and Paleozoic sedimentary rocks and by a mid-Tertiary stock of quartz monzonite. The northern part is underlain predominantly by the quartz monzonite of the Little Cottonwood stock and by smaller peripheral areas of Precambrian sedimentary rocks and a thin sequence of Paleozoic beds. South of the stock, and separated from it by the Deer Creek fault, the area is underlain by younger Precambrian sedimentary rocks and a much thicker section of Paleozoic rocks. These sedimentary rocks are arched into a dome and broken by a complex of generally east-west faults. The sections of Paleozoic rocks of diverse thicknesses exposed north and south of the Deer Creek fault have been brought together in the central Wasatch Range by the Charleston-Nebo thrust of Late Cretaceous age, now concealed in the hanging wall of the Deer Creek fault. The investigations resulted in the collection of 561 samples: 291 stream sediment and 270 rock samples. Many of the rock samples were collected from mines and prospects. The aeromagnetic data reflect and define the limits of intrusive igneous bodies, some of which contain submarginal-grade molybdenum deposits and minor occurrences of tungsten.