Hilltop Mine

Site Name

Primary: Hilltop Mine

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Commodity

Primary: Fluorine-Fluorite
Secondary: Uranium
Secondary: Beryllium

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Location

State: Utah
County: Juab
District: Spor Mtn-Thomas Range

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Land Status

Land ownership: Private
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.

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Holdings

Not available

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Workings

Type: Surface

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Ownership

Owner Name: Fair Deal Mining Co

Owner Name: E. J. Hamblin
Years: 1980 -

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Replacement
Operation Type: Unknown
Year First Production: 1948
Discovery Year: 1948
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

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Physiography

General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Great Basin
Physiographic Detail: Thomas Mountains - Tintic Mountains

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Mineral Deposit Model

Not available

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Orebody

Form: PIPE-LIKE

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Structure

Type: R
Description: Basin & Range

Type: L
Description: Numerous Branching Faults That Are Difficult To Trace Unless They Contain Breccia

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Alterations

Alteration Type: L
Alteration Text: Clay Alteration

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Rocks

Name: Volcanic Breccia (Agglomerate)
Role: Associated
Age Type: Associated Rock
Age Young: Miocene

Name: Volcanic Breccia (Agglomerate)
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Silurian

Name: Volcanic Breccia (Agglomerate)
Role: Associated
Age Type: Host Rock
Age Young: Late Silurian

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Analytical Data

Analytical Data: N. ORE BODY, OPEN CUT = .010% U3O8, .006% U3O8, 59.5% CAF2
Analytical Data: PROSPECT, OPEN CUT, 800 FT NW OF MAIN WORKINGS = .039% U3O8
Analytical Data: 1964 ASSAYS: RHYODACITE ORE BODY, OPEN CUT = .039% U3O8, .094% U3O8

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Materials

Ore: Fluorite
Gangue: Bertrandite
Gangue: Carnotite

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Comments

Comment (Location): SECTION SUBDIVISIONS SE 1/4 SW 1/4 NE 1/4

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 ; ECON.COM: MINE SOLD BY WILDEN F. CO. TO FAIR DEAL MINING CO. APRIL 1980

Comment (Deposit): DEPOSIT CONSISTS OF 2 SMALL PIPES. THE ORE IS CHIEFLY BROWN FLUORSPAR BOXWORK.

Comment (Workings): WORKINGS CONSIST OF A BULLDOZER CUT, AND TWO OPEN PITS.

Comment (Geology): A FAULT SW OF THE 2 PIPES DISPLACES BEDS ABOUT 50 FT

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

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References

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): STAATZ, 1964, GEOLOGY AND MINERAL DEPOSIT OF THOMAS & DUGWAY RANGES: USGS PP 415

Reference (Deposit): BULLOCK, K.C., 1976, FLUORITE OCCURRENCES IN UTAH: UTAH GEOL. & MINERAL SURVEY BULL. 110.

Reference (Deposit): 6) LINDSEY, D.A., GANOW, H., AND MOUNTJOY, W., 1973, HYDROTHERMAL ALTERATION ASSOCIATED WITH BERYLLIUM DEPOSITS AT SPOR MOUNTAIN, UTAH: USGS PP. 818-A, 20P.

Reference (Deposit): 7) LINDSEY, D.A., NAESER, C.W., & SHAWE, D.R., 1975, AGE OF VOLCANISM, AND MINERALIZATION IN THE THOMAS RANGE, KEG MTN., AND DESERT MTN., WESTERN UTAH: USGS JOURNAL OF RESEARCH, V. 3, NO. 5, P. 597-604.

Reference (Deposit): 8) LINDSEY, D.A., 1975, MINERALIZATION HALOS AND DIAGENESIS IN WATER-LAID TUFF OF THE THOMAS RANGE, UTAH: USGS PP. 818-B, 59P.

Reference (Deposit): 9) LINDSEY, D.A., 1977, EPITHERMAL BERYLLIUM DEPOSITS IN WATER-LAID TUFF, WESTERN UTAH: ECON. GEOL., V. 72, P. 219-232.

Reference (Deposit): 10) LINDSEY, D.A., 1979, PRELIMINARY REPORT ON TERTIARY VOLCANISM AND URANIUM MINERALIZATION IN THE THOMAS RANGE AND NORTHERN DRUM MOUNTAINS, JUAB COUNTY, UTAH: USGS OPEN FILE RPT. 79-1076, 101 P.

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): 5) LEEDOM, S.H., AND MITCHELL, T.P., 1978, PRELIMINARY STUDY OF FAVORABILITY FOR URANIUM RESOURCES IN JUAB, COUNTY, UTAH: BENDIX FIELD ENGINEERING CORP, DOE CONTRACTOR, GJBX-23 (78).

Reference (Deposit): 11) SHAWE, D.R., 1972, RECONNAISSANCE GEOLOGY AND MINERAL POTENTIAL OF THOMAS, KEG, AND DESERT CALDERAS, CENTRAL JUAB CO., UTAH: USGS PP 800-B, PP. B67-B77.

Reference (Deposit): 12) STAATZ, M.H., AND BAUER, H.L., JR., 1951, A PRELIMINARY REPORT ON THE RADIOACTIVE FLUORITE DEPOSITS, THOMAS RANGE, JUAB COUNTY, UTAH: USGS-US AEC TEM-167-A, 11 P.

Reference (Deposit): 13) STAATZ, M.H., 1963, GEOLOGY OF THE BERYLLIUM DEPOSITS IN THE THOMAS RANGE JUAB COUNTY, UTAH: USGS BULL. 1142-M, 34 P.

Reference (Analytical Data): SRC.REF: USGS PP 415

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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