Ontario Mine

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

Name: Ontario Mine  

State:  Utah

County:  Summit

Elevation: 7,920 Feet (2,414 Meters)

Primary Mineral: Silver, Lead, Zinc

Lat, Long: 40.62417, -111.49722

Map: View on Google Maps

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.


Satelite image of the Ontario Mine

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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