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
Elevation: 9,150 Feet (2,789 Meters)
Commodity: Lead, Silver, Zinc
Lat, Long: 40.61861, -111.54028
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Keystone Tunnels MRDS details
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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