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The AAPG/Datapages Combined Publications Database

Utah Geological Association

Abstract


Geology and Geologic Resources and Issues of Western Utah, 2009
Pages 169-176

Mineral Exploration in the Northern Keg Mountains, Juab County, Utah

Margaret E. Venable

Abstract

Recent work by Inland Explorations Ltd. has encountered strong evidence for a concealed mineral deposit under Lead Hill in the Keg district. Situated 60 km west of the Tintic district on the Tintic-Deep Creek mineral belt, the Keg district has widespread anomalous lead, zinc, copper, molybdenum, silver, and gold occurrences on surface, and at depth may host porphyry-style mineralization, skarns, and/or associated Tintic-style replacement bodies.

The Keg district is hosted by Paleozoic limestone and quartzite with unconformably overlying Tertiary volcanic rocks, intruded by intermediate to felsic intrusive rocks. Igneous activity is temporally related to the Keg and Thomas calderas and ranges in age from Eocene to Miocene. Structural disruption includes Cretaceous thrusting and folding and steeper faults and areas of collapse of Tertiary age associated with caldera activity and Basin and Range extension.

Present work by Inland Explorations Ltd. includes a detailed aeromagnetic survey and surface sampling and mapping, as well as three lines of deep looking IP/Resistivity and an SP/Resistivity survey centered on Lead Hill. Results to date indicate that the Lead Hill area is favorable for a concealed deposit. Geophysical surveys and geological mapping indicate that the first 150 m consist of scattered pods of sulfides and extensive silicification with associated mineralization. Beneath this is a slightly magnetic and conductive body interpreted to be an area of skarn alteration and mineralization underlain by a deep rooted magnetic low which may be an altered felsic intrusive. The correspondence of the area of high IP response starting around 150 m and continuing to at least 500 m depth with the most intense geochemical anomalies of lead, zinc, molybdenum, gold, and silver on surface suggest the possibility of a large mineralized body at depth, possibly porphyry mineralization with associated skarn.


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