Ontario Mine

The Ontario Mine is a lead, zinc, and silver mine located in Summit county, Utah at an elevation of 7,874 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

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Site Name

Primary: Ontario Mine

Commodity

Primary: Lead
Primary: Zinc
Primary: Silver
Secondary: Cadmium
Secondary: Antimony
Secondary: Copper

Location

State: Utah
County: Summit
District: Park City Dist.

Land Status

Not available

Holdings

Not available

Workings

Type: Underground

Ownership

Owner Name: United Park City Mines Co.

Owner Name: Park City Ventures (Anaconda, Asarco)

Production

Year: 1970
Time Period: 1875-1970
Material type: ORE
Description: Cp_Grade: ^4.13 % Pb, 5.46 % Zn, 0.098 % Cu, 21.02 G Ag/Mt, 0.02 G Au/Mt
Year: 1975
Material type: ORE
Description: Ap_Grade: ^7. % Pb, 9.9 % Zn, 154 G/Mt Ag, (Est. By P.G.S. For April - Dec '75)

Deposit

Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Year First Production: 1895
Discovery Year: 1868
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Middle Rocky Mountains
Physiographic Detail: Wasatch Mountains

Mineral Deposit Model

Not available

Orebody

Form: IRREGULAR, ERRATIC POCKETS AND VEINS

Structure

Type: R
Description: Park City Anticline - Ore On East And West Limbs

Type: L
Description: Ontario Fault - Vein, Hawkeye And Number Nine Faults

Alterations

Not available

Rocks

Name: Quartzite
Role: Host
Age Type: Host Rock
Age Young: Mississippian

Name: Quartzite
Role: Host
Age Type: Host Rock Unit
Age Young: Mississippian

Analytical Data

Analytical Data: 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

Materials

Ore: Galena
Ore: Sphalerite
Gangue: Pyrite
Gangue: Quartz
Gangue: Calcite

Comments

Comment (Reserve-Resource): OVER 4 MIL MT

Comment (Commodity): RECOVERY RATES 86% FOR PB, 87% FOR ZN IN 1975 AND IMPROVEMENT IS EXPECTED.

Comment (Production): 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.

Comment (Workings): 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.

References

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

Reference (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

Reference (Deposit): GRANT, S. K., 1966, METALLIZATION AND PARAGENESIS IN THE PARK CITY DIST., UTAH, PHD THESIS, 183 P.

Reference (Deposit): 1971 DIREXPL PARK CITY VENTURES - NEW ORE FOUN

Reference (Production): MINING RECORD 7-9-75. JAMES, A. H., 1973, PB - ZN IN UTAH P. 29

Reference (Reserve-Resource): E/MJ, FEB. 1976. P. 67

Reference (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

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