Haile-Ridgeway; Brewer mining district

Region East, Southeast
Mineral systems
Deposit types
Critical minerals
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Polygon around Brewer mining district. Focus area includes Persimmon Fork and Richtex Formations.
Identified resources Historical production of gold and silver. Identified resources for fluorine (topaz).
Production Ridgeway mine: 1,500,000 ounces of gold and 900,000 oz Ag; Haile mine: more than 5,000,000 oz Au; Brewer mine (1987-1995): 178,000 oz oxide gold from open pits.
Status Past mining. Exploration for gold ongoing; Brewer is set to reopen.
Estimated resources Topaz reserves at the Brewer mine, South Carolina, are about 100,000 tons of schist averaging about 15% topaz; hypothetical resources are estimated at about 800,000 tons of rock. Canadian Company reportedly considering to reopen for Au.
Geologic maps Hibbard and others (2006), scale 1:500,000; Horton and Dicken (2001), scale 1:250,000; Bell (1980), scale 1:24,000; Barker and Secor (2005), scale 1:24,000; Fries (1942a, plate 4), scale 1:6,000.
Geophysical data Inadequate Rank 4 aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Persimmon Fork Formation: quartz-sericite schist, quartz granofel; Richtex Formation: juvenile metasedimentary rocks.
Deposits Haile mine (MRDS dep_id: 10084589), Ridgeway mine (MRDS dep_id: 10056348), Brewer mine (MRDS dep_id: 10069808).
Evidence from mineral occurrences MRDS; Shawe (1976).
Geochemical evidence Elevated values of Zn (200 ppm) in streambed sediments (Bell and McElveen, 1972); Te up to 79 ppm and Bi up to 70 ppm at Haile (Bell and Larson, 1984).
Geophysical evidence Unknown.
Evidence from other sources Geologic mapping.
Comments This includes a large area where there is potential for other disseminated gold sulfide deposits associated with meta-volcanic and meta-sedimentary rocks; with low or unknown potential for byproduct critical minerals.
Cover thickness and description Exposed to covered; cover estimated at less than 10 to greater than 50 m. Cover materials include intensely saprolitized rock and Cretaceous and younger sedimentary rocks.
Authors Nora K. Foley, Bernard E. Hubbard, R.H. Morrow, IV.
New data needs Geologic mapping, geochemistry, geophysics.
Geologic mapping and modeling needs 1:24,000 scale mapping, Regional mapping, framework studies, and geochemical analyses to assess the resource quality/grade.
Geophysical survey and modeling needs High resolution aeromagnetic and aeroradiometric coverage. Aeromagnetic data expected to image mafic rocks, lithologic contacts, and associated structures, radiometric data can help with geologic mapping in vegetated terrane; alteration may be imaged. Electromagnetic methods may help image sulfides.
Digital elevation data needs Lidar complete.