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
Elevation: 5,151 Feet (1,570 Meters)
Commodity: Fluorine-Fluorite
Lat, Long: 39.71139, -113.18667
Map: View on Google Maps
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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.
Evening Star Prospect MRDS details
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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