Balmount Atlanta Tunnel

The Balmount Atlanta Tunnel is a silver, zinc, and lead mine located in Summit county, Utah at an elevation of 9,449 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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Site Name

Primary: Balmount Atlanta Tunnel
Secondary: Silver King Coalition Group
Secondary: United Park City Mines
Secondary: Balmount-Atlanta Tunnel

Commodity

Primary: Silver
Primary: Zinc
Primary: Lead
Secondary: Gold
Secondary: 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: Surface/Underground

Ownership

Owner Name: United Park City Mines Co.

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
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: VEIN

Form: VEIN

Structure

Type: R
Description: Uinta-Cottonwood Arch, Sevier Overthrust Belt, Iron Hollow Syncline

Type: L
Description: Northeast Striking Crescent Fault Zone

Alterations

Alteration Type: L
Alteration Text: Oxidation, Silicification

Rocks

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

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

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

Analytical Data

Not available

Materials

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

Comments

Comment (Deposit): BALMOUNT SHAFT AREA, OTHERWISE KNOWN AS THE SILVER HILL SHAFT AREA, PRODUCED 811,382 TONS OF ORE GRADING .019 OZ/TON AU, 7.50 OZ/TON AG, 11.33% PB, 6.01% ZN, AND .19% CU. SOME OF THIS PRODUCTION MAY HAVE COME FROM THE BALMOUNT-ATLANTA TUNNEL. ; INFO.SRC : 1 PUB LIT

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

Comment (Development): PROSPECTS ABANDONED IN 1903; HOWEVER, MAY HAVE BEEN ACTIVE DURING THE LATER DEVELOPMENT OF THE SILVER HILL AREA

Comment (Deposit): SEVERAL EAST-WEST STRIKING FISSURES ARE EXPOSED IN THE TUNNEL. ONE FISSURE, LOCATED 700 FT FROM THE PORTAL, SHOWED GOOD STAINING AND SOME MINERALIZATION. AS OF 1903 NO ORE HAD BEEN FOUND. DEVELOPMENT MAY HAVE BEEN DONE HERE DURING THE ACTIVITY AT THE ADJACENT SILVER HILL SHAFT. PRESUMABLY BOTH VEIN AND REPLACEMENT TYPES OF MINERALIZATION ARE PRESENT, REPLACEMENTS BEING LOCATED IN THE THAYNES FORMATION

Comment (Workings): LOCATION GIVEN FOR CARD IS THE PORTAL OF THE BALMOUNT-ATLANTA TUNNEL. THIS TUNNEL WAS BLOCKED 1200 FT FROM PORTAL IN 1903. TOTAL LENGTH AT THAT TIME IS UNKNOWN. ONE OTHER ADIT, OF UNKNOWN LENGTH, AND TWO PROSPECT PITS ARE LOCATED NEAR THE BALMOUNT-ATLANTA TUNNEL. MUCH LENGTHENING OF THESE ADITS MAY HAVE TAKEN PLACE DURING THE DEVELOPMENT WORK AT THE BALMOUNT SHAFT, OTHERWISE KNOWN AS THE SILVER HILL SHAFT.

Comment (Geology): WORKINGS EXPLORE A NORTHEAST STRIKING SPLAY OF THE CRESCENT FAULT ZONE WHICH TRANSECTS THE ANKAREH FORMATION AT THE SURFACE

Comment (Deposit): Discovery Year: LATE 1800'S

References

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): ERICKSON, 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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