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Ontario Mine

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

Geologic information

Identification information

Deposit ID 10073159
MRDS ID W019006
Record type Site
Current site name Ontario Mine

Geographic coordinates

Geographic coordinates: -111.48967, 40.62494 (WGS84)
Elevation 2400
Relative position 2 KM SOUTH OF PARK CITY, UTAH

Site location context

Political divisions (FIPS codes)

Summit(county)

Utah(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Heber City(quadrangle 1:24,000 scale)

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

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

Hydrologic units (watersheds)

Upper 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

Commodities

Commodity Importance
Lead Primary
Zinc Critical Primary
Silver Primary
Cadmium Secondary
Antimony Critical Secondary
Copper Secondary

Comments on the commodity information

  • RECOVERY RATES 86% FOR PB, 87% FOR ZN IN 1975 AND IMPROVEMENT IS EXPECTED.

Materials information

Materials Type of material
Galena Ore
Sphalerite Ore
Calcite Gangue
Pyrite Gangue
Quartz Gangue

Analytical data

Result DISTRICTS HUMBUG BEDS REPLACEMENT ORE HISTORICALLY AVERAGED 6.4% PB, 8.67% ZN, 0.14% CU, 199 G/MT AG, 0.86 G/MT AU. NEW ORE AVERAGES 7% PB, 9.9% ZN, 154 G/MT AG + BYPRODUCT CD, SB, CU

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
    Stratigraphic age (youngest) Mississippian
    Stratigraphic age (youngest) Mississippian
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Humbug Formation Ls., Sandy Ls., Quartzite, Calc. Ss
    Rock description Humbug Formation Ls., Sandy Ls., Quartzite, Calc. Ss

Nearby scientific data

(1) -111.48967, 40.62494
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Park City Anticline - Ore On East And West Limbs
Type of structure Local
Structure description Ontario Fault - Vein, Hawkeye And Number Nine Faults

Ore body information

  • General form IRREGULAR, ERRATIC POCKETS AND VEINS
    Plunge 25 DEG NE
    Depth to bottom 730M

Controls for ore emplacement

  • Fault And Bedding Control

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Significant No
Discovery year 1868
Discoverer Ontario Silver Mining Co.
Year of first production 1895

Mining district

District name Park City Dist.

Ownership information

  • Type Operator
    Owner Park City Ventures (Anaconda, Asarco)
  • Type Owner
    Owner United Park City Mines Co.

Production statistics

  • Year 1970
    Period 1875-1970
    Material ORE
    Accuracy Accurate
    Description Cp_Grade: ^4.13 % Pb, 5.46 % Zn, 0.098 % Cu, 21.02 G Ag/Mt, 0.02 G Au/Mt
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 0g/mt
    Ore Silver Silver 21g/mt
    Ore Copper Copper 0wt-pct
    Major Ore Zinc Zinc 5wt-pct
    Trace Ore Lead Lead 4wt-pct
  • Year 1975
    Material ORE
    Accuracy Estimate
    Description Ap_Grade: ^7. % Pb, 9.9 % Zn, 154 G/Mt Ag, (Est. By P.G.S. For April - Dec '75)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Silver Silver 154g/mt
    Major Ore Zinc Zinc 10wt-pct
    Trace Ore Lead Lead 7wt-pct

Comments on the production information

  • 272 MTPD ORE SHIPPED TO MIDVALE MILL, 1965 - 1970. IN 1971, ORE SHIPMENTS WERE TERMINATED AND AN EXPLORATION AND DEVELOPMENT PROGRAM BEGAN. MINE REOPENED 4 - 75, REACHED 635 MTPD (4536 MTPWEEK) BY 7 - 75. RECOVERY RATE FOR PB - 86%, ZN - 87% AND IMPROVING.

Comments on the reserve resource information

  • OVER 4 MIL MT

Workings at the site

  • Type of workings Underground
    Overall depth 760M

Comments on the workings information

  • ORE IS LOCATED ON THE NOSE OF A NORTHERLY PLUNGING ANTICLINE. NEW DEPOSITS ARE IN POCKETS OF 5,000 TO 50,000 TONS AT DEPTHS OF BETWEEN 610 AND 730 M. INDIVIDUAL ORE SHOOTS ARE 200 M LONG, 15 M WIDE 3 M THICK.

Reference information

Bibliographic references

  • Deposit

    BARNES, M. P., SIMOS, J. G., 1968, ORE DEPOSITS OF THE PARK CITY DIST. WITH A CONTRIBUTION ON THE MAYFLOWER LODE; IN RIDGE, J. D. ED, ORE DEPOSITS OF U. S. 1933 - 1967, V. 2 P. 1102

  • Deposit

    JAMES, A. H., 1973, LEAD AND ZINC RESOURCES IN UTAH; UTAH GEOL. AND MINERALOGICAL SURVEY, SPECIAL STUDIES 44, JULY 1973 P. 26 - 32

  • Deposit

    WHITE, L., 1975, ONTARIO PROJECT KEEPS MINING ALIVE IN UTAH'S HISTORIC PARK CITY DISTRICT; ENGIN. AND MINING JOUR. 2 - 76 P. 67 - 72

  • Deposit

    GRANT, S. K., 1966, METALLIZATION AND PARAGENESIS IN THE PARK CITY DIST., UTAH, PHD THESIS, 183 P.

  • Deposit

    1971 DIREXPL PARK CITY VENTURES - NEW ORE FOUN

  • Production

    MINING RECORD 7-9-75. JAMES, A. H., 1973, PB - ZN IN UTAH P. 29

  • Reserve-Resource

    E/MJ, FEB. 1976. P. 67

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1976 Schruben, Paul G. U.S. Geological Survey

Beyond USGS

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

External references

Maps centered on this site