Evening Star Prospect

The Evening Star Prospect is a fluorine-fluorite mine located in Juab county, Utah at an elevation of 5,151 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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MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Evening Star Prospect

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

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Replacement
Operation Type: Unknown
Discovery Year: 1953
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: Spor Mountains

Mineral Deposit Model

Not available

Orebody

Form: VEIN

Structure

Type: R
Description: Basin & Range

Type: L
Description: A Fault Trending N26e Dips 60 Deg. Sw

Alterations

Alteration Type: L
Alteration Text: Clay Alteration, Contact Metamorphism

Rocks

Name: Rhyolite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Miocene

Name: Rhyolite
Role: Associated
Age Type: Host Rock
Age Young: Late Silurian

Name: Rhyolite
Role: Associated
Age Type: Associated Rock
Age Young: Miocene

Name: Rhyolite
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Silurian

Analytical Data

Analytical Data: 1964 DUMP SAMPLE = .023% U3O8

Materials

Gangue: Bertrandite
Gangue: Carnotite

Comments

Comment (Location): SECTION SUBDIVISIONS NW 1/4 NE 1/4 NW 1/4

Comment (Production): PRODUCTION FIGURES NOT KNOWN

Comment (Development): RECENT URANIUM EXPLOR. INDICATES A FAIR U3O8 CONTENT (UP TO 0.15-0.20%), BUT IT OCCURRS IN COMPLEX STRUCTURE WITH F IONS WHICH MAKES IT ECONOMICALLY MARGINAL FOR EXTRACTION

Comment (Workings): DOZER TRENCH 80 X 6 FT, INCLINE SHAFT

Comment (Geology): FLUORSPAR IS EXPOSED ALONG A ZONE OF SHEARING & FAULTING FOR A DISTANCE OF ABOUT 72 FT. IT IS FINE-GRAINED, MASSIVE & PURPLE.

Comment (Commodity): CHIEF IMPURITIES ARE MONTMORILLONITE, CREAM COLORED DOLOMITE & QUARTZ

References

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): STAATZ, M.H., & OSTERWALD, F.W., 1959, GEOLOGY OF THE THOMAS RANGE FLUORSPAR DISTRICT, JUAB COUNTY: USGS BULL. 1069.

Reference (Deposit): STAATZ, M.H., AND CARR, W.J., 1964, GEOLOGY AND MINERAL DEPOSITS OF THE THOMAS & DUGWAY 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): COCHRAN, K.L., 1952, FLUORSPAR RESOURCES OF CALIFORNIA, NEVADA, UTAH, IDAHO, AND COLORADO ADJACENT AND TRIBUTARY TO FACILITIES OF THE UNION PACIFIC RAILROAD COMPANY: UNION AND PACIFIC RAILROAD COMPANY, LOS ANGLES, CALIFORNIA, 78 P.

Reference (Deposit): 1951 DIREXPL US AEC

Reference (Deposit): 1959 RECON STAATZ, USGS BULL. 1069

Reference (Deposit): 1964 RECON STAATZ, USGS PP 415

Reference (Deposit): 1979 GEOLMAP LINDSEY, D.A., USGS MAP-I-1176

Reference (Production): EVERTS, M.L., 1980, ON SITE INVESTIGATION: UTAH GEOL. AND MINERAL SURVEY

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