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A mineral resource survey of the 520-acre Quigg West Wilderness Study Area (MT-074-155) was made in 1986-87 at the request of the U.S. Bureau of Land Management. The study area, in central-western Montana, about 16 miles (mi) west of Philipsburg, was evaluated for its mineral resources (known) and mineral resource potential (undiscovered). No identified (known) resources exist in the wilderness study area and no producing mines exist in or adjacent to it. However, high-grade gold values, as much as 1.24 troy ounces gold per ton, were obtained from one prospect in the southern part of the study area. About 20 claims have been located in the vicinity since the late 1800's, but none are currently active. The southern part of the wilderness study area has a moderate resource potential for gold and molybdenum in quartz veins related to granitic intrusive rocks; the remainder of the area has a low potential for deposits of this type. The northwestern part of the wilderness study area has a moderate resource potential for copper and silver in sandstone-hosted strata-bound deposits; the remainder of the study area has a low resource potential for sandstonehosted copper and silver. Two small areas of gravels in terrace deposits are present in the southern part of the wilderness study area and have a low resource potential for placer gold and placer sapphires. The entire area is rated as having a low resource potential for gold and molybdenum within the interior part of a porphyry molybdenum system; silver-copper-gold within the peripheral part of a porphyry molybdenum system; gold in alluvial deposits of present-day streams; barite in veins; uranium; and geothermal resources. The entire area is rated as having no potential for oil and gas. Location, Geologic Setting, and Resources The Quigg West study area is in the Northern Rocky Mountains and lies in an unnamed range immediately west of the John Long Mountains (fig. 1). The 520-acre study area is on the northeast side of Rock Creek, which flows across the structural grain of the rocks of the region, and the study area ranges from about 4,700 to 6,900 feet (ft) in elevation. The area is near Philipsburg, Montana, from which a paved, then gravel, road provides access to the valley of Rock Creek. The study area consists mainly of strata of the Middle Proterozoic Belt Supergroup, a sequence of sedimentary rocks that were laid down about 900-1,600 million years (m.y.) ago (see geologic time chart in Appendix). Only the Mount Shields Formation of the Missoula Group of the Belt rocks is exposed in the study area. Mountain-building forces deformed the sedimentary strata prior to about 82 m.y. ago, and resulted in the development of westward-dipping thrust faults that separate repeated (stacked) sequences of strata. Granitic rocks intruded the strata after they were thrustfaulted and are exposed about 1 mi east of the study area, about 3 mi west of it, and may lie concealed in the subsurface immediately west of the study area. Field and laboratory studies were conducted to assess the identified resources and mineral resource potential of the study area. Geologic mapping was conducted to supplement that done previously in the general area to aid in the determination of possible controls of mineralization. A geochemical study was made, based on spectrographic and chemical analysis of stream sediments and rock samples Quigg West Wilderness Study Area 01

Mineral resources of the Quigg West Wilderness Study Area, Granite County, Montana