Alta-Helena Tunnel

The Alta-Helena Tunnel is a copper mine located in Salt Lake county, Utah at an elevation of 9,551 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: Alta-Helena Tunnel  

State:  Utah

County:  Salt Lake

Elevation: 9,551 Feet (2,911 Meters)

Commodity: Copper

Lat, Long: 40.58778, -111.60861

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 Alta-Helena Tunnel

Alta-Helena Tunnel MRDS details

Site Name

Primary: Alta-Helena Tunnel
Secondary: Alta Helena Group


Commodity

Primary: Copper
Tertiary: Iron


Location

State: Utah
County: Salt Lake
District: Little Cottonwood 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

Not available


Ownership

Not available


Production

Not available


Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Method: Unknown
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: IRREGULAR


Structure

Type: R
Description: Uinta-Cottonwood Arch, Cordilleran Hingeline. Sevier Overthrust Belt

Type: L
Description: East-Northeast Striking Faults


Alterations

Alteration Type: L
Alteration Text: Oxidation, Contact Metasomatism


Rocks

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


Analytical Data

Not available


Materials

Ore: Chalcopyrite
Ore: Malachite
Gangue: Calcite
Gangue: Actinolite
Gangue: Chlorite
Gangue: Garnet
Gangue: Quartz
Gangue: Diopside
Gangue: Pyrite
Gangue: Epidote
Unknown: Magnetite


Comments

Comment (Location): TOWNSHIP IS UNSURVEYED ; INFO FROM LAND.ST :1983

Comment (Deposit): NINE PITS, ADITS, AND SHAFTS COMPRISE THIS GROUP OF WORKINGS ALL PROSPECTS WERE DEVELOPED ON CU + FE SKARN MINERALIZATION. IN THESE DEPOSITS, MALACHITE, AZURITE, AND RARE CHALCOPYRITE OCCUR IN MAGNETITE RICH SKARN BODIES HOSTED BY LIMESTONE AND LYING ADJACENT TO THE ALTA STOCK

Comment (Workings): IN ADDITION TO MAIN TUNNEL, TWO SHAFTS, 5 ADITS, AND TWO PROSPECT PITS ARE LOCATED ON PROPERTY TO NORTHEAST OF MAIN PORTAL.

Comment (Geology): PORTAL OF TUNNEL IS IN THE TINTIC QUARTZITE. STRATIGRAPHIC SEQUENCE UP TO THE DESERET LIMESTONE PRESENT ON PROPERTY. CONTACT OF ALTA STOCKWITH SEDIMENTS LIES ALONG NORTH EDGE OF PROPERTY. TWO EAST-NORTHEAST STRIKING FAULTS PRESENT


References

Reference (Deposit): CALKINS, F.C., AND BUTLER, B.S., 1943, GEOLOGY AND ORE DEPOSITS OF THE COTTONWOOD-AMERICAN FORK AREA. UTAH: U.S. GEOLOGICAL SURVEY PROF. PAPER, NO. 201.

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.

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


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