The Thursday Mine is a fluorine-fluorite mine located in Juab county, Utah at an elevation of 5,518 feet.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
Elevation: 5,518 Feet (1,682 Meters)
Commodity: Fluorine-Fluorite
Lat, Long: 39.75306, -113.19556
Map: View on Google Maps
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Thursday Mine MRDS details
Site Name
Primary: Thursday Mine
Commodity
Primary: Fluorine-Fluorite
Secondary: Uranium
Secondary: Beryllium
Location
State: Utah
County: Juab
District: Spor Mtn-Thomas Range
Land Status
Land ownership: BLM Administrative Area
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Holdings
Not available
Workings
Type: Surface/Underground
Ownership
Owner Name: Wilden Fluorspar Co.
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Replacement
Operation Type: Unknown
Discovery Year: 1949
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Great Basin
Physiographic Detail: Thomas Mountains - Tintic Mountains
Mineral Deposit Model
Not available
Orebody
Form: PIPE-LIKE & VEINS
Structure
Type: R
Description: Basin & Range
Type: L
Description: Numerous Branching Faults That Are Difficult To Trace Unless They Contain Breccia
Alterations
Alteration Type: L
Alteration Text: Clay Alteration
Rocks
Name: Rhyolite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Miocene
Name: Rhyolite
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Silurian
Name: Rhyolite
Role: Associated
Age Type: Associated Rock
Age Young: Miocene
Name: Rhyolite
Role: Associated
Age Type: Host Rock
Age Young: Late Silurian
Analytical Data
Analytical Data: LARGE VEIN-OPEN CUT = .012% U3O8
Analytical Data: 1964 ASSAY: SE ORE BODY, 21 FT BELOW SURFACE = .005% U3O8
Materials
Ore: Fluorite
Gangue: Bertrandite
Gangue: Carnotite
Comments
Comment (Location): SECTION SUBDIVISIONS SW 1/4 NE 1/4 NE 1/4
Comment (Development): RECENT URANIUM EXPLOR. INDICATES A FAIR U3O8 CONTENT (UP TO 0.15-0.20%), BUT IT OCCURS IN COMPLEX STRUCTURE WITH F IONS WHICH MAKES IT ECONOMICALLY MARGINAL FOR EXTRACTION
Comment (Deposit): A VEIN DEPOSIT ON THIS PROPERTY PRODUCED ABOUT 55 TONS. ALL PRODUCTION CAME FROM SURFACE WORKINGS MAINLY ON THE VEIN. THE PIPE HAS A LENGTH OF 60 FT & A WIDTH OF 10 FT. ORE IS WHITE-PALE PURPLE
Comment (Workings): WORKINGS CONSIST OF 2 ADITS, A FEW OPEN CUTS, & SEVERAL PROSPECT PIT. THE ADIT BEARS S43E ALONG A FAULT FOR A DIST. OF 175 FT. A 2ND ADIT N80W FOR 300 FT, 150 FT. BELOW THE MAIN ADIT LEVEL.
Comment (Commodity): CHIEF IMPURITIES ARE MONTMORILLONITE, CREAM COLORED DOLOMITE & QUARTZ
References
Reference (Deposit): STAATZ, M.H., AND CARR, W.J., 1964, GEOLOGY AND MINERAL DEPOSITS OF THE THOMAS & DUG WAY RANGES, JUAB-TOOELE CO., UT: USGS PP 415.
Reference (Deposit): STAATZ, M.H., AND WILMARTH, V.R., & BAUER, H.L., JR., 1951, RADIOACTIVE FLUORITE IN THE THOMAS RANGE, JUAB CO., UT: USGS TEI #136, 88 P.
Reference (Deposit): 1951 DIREXPL US AEC TEI-136
Reference (Deposit): 1959 RECON STAATZ, USGS BULL. 1069
Reference (Deposit): 1964 RECON STAATZ, USGS PP 415
Reference (Deposit): COCHRAN, K.L., 1952, FLUORSPAR RESOURCES OF CALIF., NEV., UTAH, IDAHO, & COLORADO ADJACENT & TRIBUTARY TO FACILITIES OF THE UNION PACIFIC RR CO: UPRC, LOS ANGELES, CALIF., 78 P.
Reference (Analytical Data): SRC.REF: USGS PP 415
Reference (Deposit): BULLOCK, K.C., 1976, FLUORITE OCCURRENCES IN UTAH: UTAH GEOL. & MINERAL SURVEY BULL. 110.
Reference (Deposit): 1979 GEOLMAP LINDSEY, D.A., USGS MAP-I-1176
Reference (Production): BULLOCK, K.C., 1976, FLUORITE OCCURRENCES IN UTAH: UTAH GEOL. & MIN SUR.
Reference (Deposit): STAATZ, M.H., & OSTERWALD, F.W., 1959, GEOLOGY OF THE THOMAS RANGE FLUORSPAR DISTRICT, JUAB COUNTY: USGS BULL. 1069.
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