Thursday Mine

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

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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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