Under the provisions of the Wilderness Act (Public Law 88-577, September 3, 1964) and related acts, the U.S. Geological Survey and the U.S. Bureau of Mines have been conducting mineral surveys of wilderness and primitive areas. Areas officially designated as "wilderness," "wild," or "canoe" when the act was passed were incorporated into the National Wilderness Preservation System, and some of them are presently being studied. The act provided that areas under consideration for wilderness designation should be studied for suitability for incorporation into the Wilderness System. The mineral surveys constitute one aspect of the suitability studies. The act directs that the results of such surveys are to be made available to the public and be submitted to the President and the Congress. This report discusses the results of a mineral survey of the

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.

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In accordance with the provisions of the Wilderness Act (Public Law 88-577, September 3, 1964) and the Conference Report on Senate bill 4, 88th Congress, the U.S. Geological Survey and the U.S. Bureau of Mines are making mineral surveys of wilderness and primitive areas. Areas officially designated as "wilderness," "wild," or "canoe" when the act was passed were incorporated into the National Wilderness Preservation System. Areas classed as "primitive" were not included in the Wilderness System, but the act provided that each primitive area should be studied for its suitability for incorporation into the Wilderness System. The mineral surveys constitute one aspect of the suitability studies. This bulletin reports the results of a mineral survey of the Popo Agie Primitive Area, Wyo., and some adjoining national forest lands that may be considered for wilderness designation.

In accordance with the provisions of the Wilderness Act (Public Law 88-577, September 3, 1964) and the Conference Report on Senate bill 4, 88th Congress, the U.S. Geological Survey and the U.S. Bureau of Mines are making mineral surveys of wilderness and primitive areas. Areas officially designated as "wilderness," "wild," or "canoe" when the act was passed were incorporated into the National Wilderness Preservation System. Areas classed as "primitive" were not included in the Wilderness System, but the act provided that each primitive area should be studied for its suitability for incorporation into the Wilderness System. The mineral surveys constitute one aspect of the suitability studies. This report discusses the results of a mineral survey of some national forest lands near the Popo Agie Primitive Area, Wyo., that may be considered for wilderness designation.