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Keystone Tunnels

Past Producer in Summit county in Utah, United States with commodities Lead, Silver, Zinc, Gold, Copper
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Ownership information
  18. Production statistics
  19. Workings at the site
  20. Links to other databases
  21. Bibliographic references
  22. General comments
  23. Reporter information

Geologic information

Identification information

Deposit ID 10014911
MRDS ID D012016
Record type Site
Current site name Keystone Tunnels

Geographic coordinates

Geographic coordinates: -111.54106, 40.61855 (WGS84)
Elevation 2789
Relative position 1800 FT N8W FROM JUPITER HILL

Site location context

Political divisions (FIPS codes)

Summit(county)

Utah(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Brighton(quadrangle 1:24,000 scale)

Salt Lake City(quadrangle 1:100,000 scale)

Salt Lake City(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Weber(hydrologic unit)

Weber(hydrologic accounting unit)

Great Salt Lake(hydrologic subregion)

Great Basin(hydrologic region)

Geographic areas

Country State County
United States Utah Summit

Public Land Survey System information

Meridian Township Range Section Fraction State
Salt Lake 002S 004E 30 NE OF SE OF NW Utah

Comments on the location information

  • INFO FROM LAND.ST :1983

Commodities

Commodity Importance
Lead Primary
Silver Primary
Zinc Critical Primary
Gold Secondary
Copper Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Malachite Ore
Sphalerite Ore
Quartz Gangue
Pyrite Unknown

Alteration

  • (Local) Oxidation, Silicification

Analytical data

Result AVERAGE GRADE WAS 0.15 OZ/TON AU, 5.04 OZ/TON AG, 11.20% PB, 4.50% ZN,

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Crescent Dike
    Rock description Crescent Dike
    Stratigraphic age (youngest) Oligocene
    Stratigraphic age (youngest) Oligocene
    Stratigraphic age (youngest) Late Triassic
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Thaynes Formation;Ankarch Formation
    Rock description Thaynes Formation;Ankarch Formation

Nearby scientific data

(1) Alluvium and colluvium
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Uinta-Cottonwood Arch, Sevier Overthrust Belt, Iron Hollow Syncline
Type of structure Local
Structure description Crescent Fault Zone

Ore body information

  • General form TABULAR
    Strike N 40 E TO N 60 E
    Dip 70 SE TO 40 SE
    Depth to top 0M
  • General form TABULAR
    Dip 70 SE TO 40 SE

Controls for ore emplacement

  • Northeast Striking Fissures, Limestone Beds Adjacent To Fissures

Comments on the geologic information

  • PARK CITY FORMATION MAY BE PRESENT AT DEPTH WITHIN THE MINE WORKINGS. ABUNDANT BRECCIATION ALONG THE CRESCENT FAULT ZONE. HOST OF REPLACEMENT ARE REPORTED TO BE SILICIFIED LIMESTONE

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1875
Year of first production 1923
Year of last production 1926

Mining district

District name Park City District

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Keystone Mining Co.

Production statistics

  • Year 1926
    Period 1923-1926
    Accuracy Estimate
    Description Cp_Grade: ^.15 Oz/Ton Au, 5.04 Oz/Ton Ag, 11.2% Pb, 4.5% Zn,
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Lead Lead 11wt-pct
    Major Ore Silver Silver 142g/mt
    Minor Ore Gold Gold 4g/mt
    Major Ore Zinc Zinc 5wt-pct

Workings at the site

  • Type of workings Underground
    Length 525.78M
    Overall depth 73.15M

Comments on the workings information

  • TWO ADITS ARE PRESENT AT THIS SITE BOTH STRIKING SOUTHEAST. THEY ARE PRESUMABLY THE LOWER AND MIDDLE ADITS OF THE KEYSTONE MINE. THE LOWER TUNNEL WAS 700 FT LONG WITH 700 FT OF LATERAL WORKINGS IN 1912. AS OF 1912, THE MIDDLE TUNNEL WAS COLLASPED. ADDITIONAL MINE WORKINGS PRESENT IN 1912 WERE AN UPPER TUNNEL, 85 FT LONG, AND A SHAFT THAT WAS 240 FT DEEP AND STILL BEING SUNK. MUCH DEVELOPMENT WAS DONE SINCE 1912 BUT HAS NOT BEEN REPORTED

Comments on development

  • PROPERTY COMPRISED OF 12 CLAIMS. PROPERTY WAS PROSPECTED IN THE EARLY HISTORY OF THE DISTRICT, DURING THE 1880'S AND 1870'S. IN 1903 AN AGGRESSIVE COMPANY BEGAN REGULAR DEVELOPMENT. DEVELOPMENT WORK CONSISTED OF DRIVING THREE ADITS AND SINKING ONE SHAFT. NO ORE OF COMMERCIAL EXTENT WERE FOUND AS OF 1912, HOWEVER, THE PROPERTY WAS A PRODUCER BY 1923. PRODUCTION LASTED UNTIL 1926. THE PROPERTY IS APPARENTLY INDEPENDENT OF THE SURROUNDING UNITED PARK CITY MINES CO. BUT MAY HAVE ONCE BEEN LEASED BY SILVER KING COALITION MINES COMPANY

Reference information

Bibliographic references

  • Deposit

    BOUTWELL, J.M., 1912, GEOLOGY AND ORE DEPOSITS OF THE PARK CITY DISTRICT, UTAH: U.S. GEOLOGICAL SURVEY PROF. PAPER, NO. 77, 231 PP.

  • Deposit

    ERIKSON, A.J., (EDITOR), 1968, PARK CITY DISTRICT, UTAH: GUIDEBOOK TO THE GEOLOGY OF UTAH, NO. 22, UTAH GEOLOGICAL SOCIETY.

  • Deposit

    BUTLER, B.S., LOUGHLIN, G.F., HEIKES, V.C., AND OTHERS, 1920, THE ORE DEPOSITS OF UTAH: U.S. GEOLOGICAL SURVEY PROF. PAPER, NO. 111, 672 PP.

  • Deposit

    BARNES, M.P., AND SIMOS, J.S., 1968, ORE DEPOSITS OF THE PARK CITY DISTRICT WITH A CONTRIBUTION ON THE MAYFLOWER LODE, IN ORE DEPOSITS OF THE UNITED STATES: AM. INST. METALL. ENG., V. II, P. 1102

  • Deposit

    BAKER, A.A., CALKINS, F.C., CRITTENDEN, M.D., JR., AND BROMFIELD, C.S., 1966, GEOLOGIC MAP OF THE BRIGHTON QUADRANGLE, UTAH: U.S. GEOLOGICAL SURVEY GEOL. QUAD. MAP GQ-534

General comments

Subject category Comment text
Deposit PROPERTY STRADDLES THE CRESCENT FAULT ZONE WHICH IS COMPRISED OF NORTHEAST STRIKING FISSURES AND RELATED SPLAYS, AND NORTHEAST STRIKING PORPHYRY DIKES. MINERALIZATION OCCURS BOTH AS SMALL FISSURED/VEIN DEPOSITS WITHIN THE NORTHEAST STRIKING FAULT ZONE AND AS REPLACEMENT DEPOSITS WHICH HAVE REPLACED LIMESTONE HORIZONS IN THE THAYNES FORMATION. REPLACEMENT ARE PROBABLY MOST ABUNDANT IN THE FOOTWALL OF THE CRESCENT FAULT
Deposit Discovery Year: 1870'S

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1984 Shubat, Michael A. Utah Geological and Mineral Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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