The Ontario Mine is a silver, lead, and zinc mine located in Summit county, Utah at an elevation of 7,920 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
Elevation: 7,920 Feet (2,414 Meters)
Commodity: Silver, Lead, Zinc
Lat, Long: 40.62417, -111.49722
Map: View on Google Maps
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Ontario Mine MRDS details
Site Name
Primary: Ontario Mine
Commodity
Primary: Silver
Primary: Lead
Primary: Zinc
Secondary: Copper
Secondary: Gold
Location
State: Utah
County: Summit
District: Park City District
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.
Holdings
Not available
Workings
Type: Surface
Ownership
Owner Name: United Park City Mines Co.
Owner Name: Noranda Ltd.
Production
Year: 1967
Time Period: 1875-1967
Material type: AG
Description: Cp_Grade: ^22.70 Oz./Ton
Year: 1967
Time Period: 1875-1967
Material type: AU
Description: Cp_Grade: ^.0535 Oz./Ton
Year: 1967
Time Period: 1875-1967
Material type: PB
Description: Cp_Grade: ^3.97%
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1873
Discovery Year: 1872
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: L
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Middle Rocky Mountains
Physiographic Detail: Wasatch Mountains
Mineral Deposit Model
Not available
Orebody
Form: TABULAR
Form: TABULAR
Structure
Type: R
Description: Uinta Arch
Type: L
Description: Park City Anticline
Alterations
Not available
Rocks
Name: Limestone
Role: Host
Age Type: Host Rock
Age Young: Mississippian
Analytical Data
Not available
Materials
Gangue: Quartz
Gangue: Pyrrhotite
Gangue: Hematite
Gangue: Calcite
Gangue: Epidote
Gangue: Garnet
Gangue: Rhodonite
Gangue: Dolomite
Gangue: Magnetite
Gangue: Pyrite
Gangue: Limonite
Gangue: Serpentine
Comments
Comment (Development): RECTOR STEEN DISCOVERED THE OUTCROP IN 1872 AND SOLD TO DEVELOPERS WHO STARTED PRODUCTION IN 1873. THE PROPERTY WAS CONSOLIDATED INTO THE ONTARIO SILVER MINING CO. WHICH OPERATED UNTIL 1936 WHEN IT MERGED WITH THE PARK UTAH CONSOLIDATED MINES CO. THE PARK UTAH MERGED WITH THE SILVER KING COALITION MINES CO. IN 1953 TO FORM THE PRESENT OWNER, THE UNITED PARK CITY MINES CO. PARK CITY VENTURES (60% ANACONDA, 40% ASARCO) LEASED THE ONTARIO IN AUGUST, 1970 AND BUILT A 700 TON PER DAY CONCENTRATER. THEY LATER DROPPED THE LEASE WHICH WAS THEN PICKED UP BY NORANDA LTD. LOW SILVER PRICES AND WATER PROBLEMS FORCED NORANDA TO LATER DROP THE LEASE.
Comment (Workings): EXTENSIVE WORKINGS, MUCH OF WHICH HAS BEEN ALLOWED TO CAVE. PRIMARY ACCESS IS THROUGH THE 1500 LEVEL DRAIN TUNNEL (KEETLEY TUNNEL) AND THROUGH THE ONTARIO NO. 3 SHAFT.
Comment (Location): LOCATION IS TO ONTARIO NO. 3 SHAFT ; INFO FROM LAND.ST :1973
Comment (Deposit): ORE BODIES STRIKE IN AN ENE DIRECTION AND DIP STEEPLY TO THE NORTH. VEIN ORE WAS THE PRINCIPAL PRODUCT OF THE EARLY PERIOD OF THE MINE AND EXTENDS FROM THE SURFACE DOWN TO ABOUT THE 1300 FT. LEVEL WHERE REPLACEMENT DEPOSITS IN THE LIMESTONE AND DOLOMITES (PREDOMINANTLY THE DOUGHNUT, HUMBUG AND DESERET LIMESTONES) PREDOMINATE.
References
Reference (Deposit): BOUTWELL, J.M., 1912, GEOLOGY AND ORE DEPOSITS OF THE PARK CITY DISTRICT, UTAH: USGS PROF. PA. 77, 230 P.
Reference (Deposit): ERICKSON, A.J., JR. (ED.), 1968, GUIDEBOOK TO THE GEOLOGY OF UTAH - PARK CITY DISTRICT, UTAH: UTAH GEOLOGICAL SOCIETY GUIDEBOOK NO. 22, 100 P.
Reference (Deposit): PERRY, L.I., AND MC CARTHY, B.M., 1977, LEAD AND ZINC IN UTAH: UGMS OFR-22.
Reference (Deposit): BROMFIELD, C.S. AND OTHERS, 1970, GEOLOGIC MAP OF THE HEBER QUADRANGLE, WASATCH AND SUMMIT COUNTIES, UTAH: USGS MAP GQ - 864.
Reference (Deposit): BARNES, M.P. AND J.G. SIMOS, 1968, ORE DEPOSITS OF THE PARK CITY DISTRICT WITH A CONTRIBUTION ON THE MAYFLOWER LODE: ORE DEPOSITS OF THE UNITED STATES, 1933 - 1967 (GRATON - SALES): AIME, VOL. 2, CH. 53, P. 1103-1126, NEW YORK.
Reference (Production): ERICKSON, A.J., 1968, P. 2.
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