Sigma Emma Mine

Past Producer in Juab county in Utah, United States with commodities Beryllium, Uranium, Fluorine-Fluorite, Lithium

Geologic information

Identification information

Deposit ID 10021607
MRDS ID DE00284
Record type Site
Current site name Sigma Emma Mine

Geographic coordinates

Geographic coordinates: -113.2211, 39.71911 (WGS84)
Elevation 1463
Relative position 2.75 MILES NORTHWEST OF BELL HILL MINE
(click for info)

Geographic areas

Country State County
United States Utah Juab

Public Land Survey System information

Meridian Township Range Section Fraction State
Salt Lake 013S 012W 5 SW OF NE Utah

Commodities

Commodity Importance
Beryllium Primary
Uranium Tertiary
Fluorine-Fluorite Tertiary
Lithium Tertiary

Materials information

Materials Type of material
Bertrandite Ore
Uranophane Ore
Calcite Gangue
Clay Gangue
Fluorite Unknown

Alteration

  • (Local) Argillic: Smectite, Sericite, K-Feldspar

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock unit name Porphyritic Rhyolite Member Of Spor Mountain Formation
    Rock description Porphyritic Rhyolite Member Of Spor Mountain Formation
    Stratigraphic age (youngest) Miocene
    Stratigraphic age (youngest) Miocene
    Stratigraphic age (youngest) Miocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic)
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff
    Rock unit name Spor Mountain
    Rock description Spor Mountain
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Volcanic Breccia (Agglomerate)

Nearby scientific data

(1) -113.2211, 39.71911

Geologic structures

Type Description Terms
Regional Tintic--Deep Creek Mineral Belt
Local Basin Range High Angle, Faults Tilt Ore-Bearing Strata; Some May Have Been Conduits For Fluids

Ore body information

  • General form TABULAR
    Strike N 40 E
    Dip 30 W

Controls for ore emplacement

  • Rhyolite Cap Rock; Permeable Tuff With Reactive Carbonate Clasts

Comments on the geologic information

  • THE BERYLLIUM TUFF MEMBER HOSTS ALL ORE ZONES; THE PROPHYRITIC RHYOLITE SERVED AS AN IMPERMEABLE BARRIER FOR MINERALIZING FLUIDS AND IS NOT MUCH MINERALIZED. ; MAJOR.UNITS: BERYLLIUM TUFF MEMBER OF SPOR MOUNTAIN FORMATION, AGE: MIO 21 MA; PORPHYRITIC RHYOLITE MEMBER OF SPOR MOUNTAIN FORMATION (MIO)

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Both metallic and non-metallic
Deposit size Large
Significant No
Discovery year 1960
Discoverer Vitro Minerals Corp (?)
Discovery method Ore-Mineral In Place

Mining district

District name Spor Mountain

Ownership information

  • Type Owner-Operator
    Owner Brush-Wellman Inc.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS DE00284

Bibliographic references

  • Deposit

    STAATZ, M.H., 1963, GEOLOGY OF MINERAL DEPOSITS IN THOMAS RANGE: USGS BULL. 1142-M.

  • Deposit

    STAATZ, M.H. AND GRIFFITTS, W.R., 1961, BE BEARING TUFF IN THOMAS RANGE: ECONOMIC GEOLOGY V. 56, NO. 5.

  • Deposit

    STAATZ, M.H., & OSTERWALD, F.W., 1959, GEOLOGY OF THOMAS RANGE FLUOR DISTRICT: USGS BULL. 1069.

  • Deposit

    LINDSEY, D.A., GANON, H., AND MOUNTJOY, W., 1973, HYDROTHERMAL ALTERATION ASSOCIATED WITH BERYLLIUM DEPOSITS AT SPOR MOUNTAN, UTAH: U.S.G.S. PROFESSIONAL PAPER 818-A, 20 P.

  • Deposit

    DAVIS, L.J., 1979, BERYLLIUM AND URANIUM MINERALIZATION IN THE SPOR MOUNTAIN AREA, JUAB COUNTY, UTAH: IN NEWMAN, G.W. AND GOODE, H.D., EDS., 1979 BASIN AND RANGE SYMPOSIUM AND GREAT BASIN FIELD CONFERENCE, ROCKY MOUNTAIN ASSOCIATION OF GEOLOGISTS AND UTAH GEOLOGICAL ASSOCIATION, P. 397-403.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1990 Lindsey, David A. U.S. Geological Survey