Keystone Tunnels

The Keystone Tunnels is a lead, silver, and zinc mine located in Summit county, Utah at an elevation of 9,150 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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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.

Site Name

Primary: Keystone Tunnels

Commodity

Primary: Lead
Primary: Silver
Primary: Zinc
Secondary: Gold
Tertiary: Copper

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: Underground

Ownership

Owner Name: Keystone Mining Co.

Production

Year: 1926
Time Period: 1923-1926
Description: Cp_Grade: ^.15 Oz/Ton Au, 5.04 Oz/Ton Ag, 11.2% Pb, 4.5% Zn,

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1923
Year Last Production: 1926
Discovery Year: 1875
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

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-Cottonwood Arch, Sevier Overthrust Belt, Iron Hollow Syncline

Type: L
Description: Crescent Fault Zone

Alterations

Alteration Type: L
Alteration Text: Oxidation, Silicification

Rocks

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Oligocene

Name: Diorite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Oligocene

Name: Diorite
Role: Associated
Age Type: Host Rock
Age Young: Late Triassic

Analytical Data

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

Materials

Ore: Sphalerite
Ore: Chalcopyrite
Ore: Malachite
Ore: Galena
Gangue: Quartz
Unknown: Pyrite

Comments

Comment (Location): INFO FROM LAND.ST :1983

Comment (Workings): 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

Comment (Geology): 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

Comment (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

Comment (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

Comment (Deposit): Discovery Year: 1870'S

References

Reference (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

Reference (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

Reference (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.

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

Reference (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.

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