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The Oquirrh Mountains lie immediately west of Salt Lake City, Utah, and are part of a geologically complex Paleozoic foreland terrane of the north-northeast-trending Late Cretaceous Sevier thrust belt in central Utah. The range is the site of four historic baseand precious-metal mining districts and a newly recognized disseminated-gold mining area. The mineralized and intruded areas in the Oquirrh Mountains nappes overlie the Uinta trend, an easterly directed, intermittently active, locally uplifted fracture zone, which is inferred to overlie a basement tectonic lineament of regional extent. The mining districts are spatially associated with Tertiary igneous rocks intruded along the extension of the trend in the Oquirrh Mountains. Further, most of the mining districts seem to be located on or near the leading margins of folded, faulted, and thinned upperplate wedges of thrust faults that moved from different parts of the Sevier hinterland. They converged onto a buttress formed by an uplifted part of the Uinta trend underlying the Oquirrh Mountains area. The porphyry copper, skarn, and vein and replacement deposits at Bingham Canyon, which comprise the largest mining district in the range, are located in the Bingham nappe at the leading edge of the sole Midas thrust fault. The disseminated gold deposits in the Mercur mining district are located near the leading edge of the broken upper plate of the Manning thrust, an imbricate thrust fault within the Bingham nappe. The baseand precious-metal deposits in the Ophir mining district occur in the leading edge of the Manning (imbricate) thrust fault. Baseand precious-metal deposits in the Stockton district are located in the South Mountain nappe at the leading edge of the Stockton thrust, which overrode the Bingham nappe. The Barneys Canyon and Melco disseminated gold deposits, considered to be part of the Bingham mining district by the mine operators, occur in the Pass Canyon nappe. Stratigraphically similar but structurally distinctive nappes 1 composed of Paleozoic clastic carbonate, siliceous, and argillaceous sequences of sedimentary rocks, were deformed during their emplacement in the Oquirrh Mountains by differentially directed thrust faults produced by the Late Cretaceous Sevier orogeny. The sedimentary rocks composing the nappes were re-faulted and uplifted locally by later Tertiary Basin-and-Range extensional deformation. Subsequently they were intruded by Tertiary quartz monzonite, granodiorite, latite, and rhyolite stocks, plugs, sills, and dikes and overlain locally by Tertiary latite flows and breccias. There are no known pre-Tertiary igneous rocks exposed. During the late stages of Tertiary intrusion, metal-rich hydrothermal solutions mixed with meteoric water locally altered and replaced the sedimentary and igneous host rocks. Ore minerals were deposited in the fractured intrusives, in sedimentary rocks along faults initiated by the Sevier-age thrusts, and as replacements of carbonate strata adjoining these faults. The magnitude and tenor of mining districts are believed to be a function of their structural position, the style of deformation within host nappes, their proximity to the Uinta trend, and their spatial association with intrusive rocks.

Sevier-age thrust fault structures control the location of base- and precious-metal mining districts in the Oquirrh Mountains, Utah