The Keystone Shaft is a silver, zinc, and lead mine located in Summit county, Utah at an elevation of 8,999 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: 8,999 Feet (2,743 Meters)
Commodity: Silver, Zinc, Lead
Lat, Long: 40.61917, -111.54083
Map: View on Google Maps
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Keystone Shaft MRDS details
Site Name
Primary: Keystone Shaft
Commodity
Primary: Silver
Primary: Zinc
Primary: Lead
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
Material type: ORE
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: Host Rock
Age Young: Late Triassic
Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Oligocene
Name: Diorite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Oligocene
Analytical Data
Analytical Data: AVERAGE GRADE WAS .15 OZ/TON AU, 5.04 OZ/TON AG, 11.20% PB, 4.5% ZN
Materials
Ore: Malachite
Ore: Gold
Ore: Sphalerite
Ore: Chalcopyrite
Ore: Galena
Gangue: Quartz
Unknown: Pyrite
Comments
Comment (Location): INFO FROM LAND.ST :1983
Comment (Production): PRODUCTION FIGURES ORIGINALLY FROM SILVER KING COALITION MINING CO. RECORDS
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 AGGRESIVE COMPANY BEGAN REGULAR DEVELOPMENT. DEVELOPMENT WORK CONSISTED OF DRIVING THREE ADITS AND SINKING ONE SHAFT. NO ORES 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 (Workings): THIS SITE IS THE MAIN SHAFT OF THE KEYSTONE MINE. ADDITIONAL MINE WORKINGS CONSIST OF THREE TUNNELS, CALLED THE UPPER, MIDDLE, AND LOWER TUNNELS. THE LOWER TUNNEL WAS 700 FT LONG, IN A SOUTHEAST DIRECTION, WITH 700 FT OF LATERAL WORKINGS. THE UPPER TUNNEL WAS 85 FT LONG. THE MIDDLE TUNNEL WAS CAVED. THE SHAFT WAS 240 FT DEEP AND WAS STILL BEING SUNK IN 1912. SINCE 1912, ORE WAS DISCOVERED AND MINE WAS IN PRODUCTION FOR 4 YEARS; SO MUCH DEVELOPMENT MUST HAVE TAKEN PLACE WHICH WAS NOT 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 ORE REPORTED TO BE SILICIFIED LIMESTONE.
Comment (Deposit): Discovery Year: 1870'S
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 FISSURE/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
References
Reference (Deposit): BAKER, A.A., CALKINS, F.C., CRITTENDEN, MD.D., JR., AND BROMFIELD, C.S., 1966, GEOLOGIC MAP OF THE BRIGHTON QUADRANGLE, UTAH: U.S. GEOLOGICAL SURVEY GEOL. QUAD. MAP GQ-534
Reference (Production): BARNES & SIMOS, 1968
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.
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 TTHE UNITED STATES: AM. INST. METALL, ENG., V. II, P. 1102
Reference (Deposit): BOUTWELL, J.M., 1912, GEOLOGY AND ORE DEPOSITS OF THE PARK CITY DISTRTICT, UTAH: U.S. GEOLOGICAL SURVEY PROF. PAPER, NO. 77, 231 PP.
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