Union Mine

The Union Mine is a gold and silver mine located in Lawrence county, South Dakota at an elevation of 5,679 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: Union Mine  

State:  South Dakota

County:  Lawrence

Elevation: 5,679 Feet (1,731 Meters)

Primary Mineral: Gold, Silver

Lat, Long: 44.32361, -103.79861

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 Union Mine

Union Mine MRDS details

Site Name

Primary: Union Mine
Secondary: Golden Reward Group


Commodity

Primary: Gold
Primary: Silver


Location

State: South Dakota
County: Lawrence
District: Ruby Basin District


Land Status

Not available


Holdings

Not available


Workings

Type: Underground


Ownership

Owner Name: Golden Reward Consolidated Gold Mining And Milling Co.


Production

Not available


Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Replacement
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S


Physiography

General Physiographic Area: Interior Plains
Physiographic Province: Great Plains Province
Physiographic Section: Black Hills


Mineral Deposit Model

Not available


Orebody

Not available


Structure

Type: L
Description: Dikes And Minor Faults One Fault To The West Of The Main Workings Has 300 Ft Downthrow.


Alterations

Not available


Rocks

Name: Phonolite
Role: Associated
Age Type: Host Rock
Age Young: Late Cambrian

Name: Phonolite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Pliocene

Name: Phonolite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Name: Phonolite
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Cambrian


Analytical Data

Not available


Materials

Ore: Gold
Ore: Silver


Comments

Comment (Location): E 1/2 , CENTRAL

Comment (Deposit): 4 MAIN ORE BODIES - 1 LARGE AND 3 MUCH SMALLER, MAIN SHOOT 100 FT WEST OF THE SHAFT. ORE BODIES 2 , 3 AND 4 LAY RESPECTIVELY 650 , 1500 , AND 1925 FT WEST OF THE SHAFT. THE STRONGEST SHOOT EXTENDS SOUTH AND IS KNOWN AS THE MOGUL SHOOT.

Comment (Geology): ROOF EITHER SHALE OR THE BOTTOM OF AN IRREGULAR PHONOLITE SILL


References

Reference (Deposit): US BUREAU OF MINES, 1954 , BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 1 , BUREAU OF MINES INFORMATION CIRCULAR 7688 .

Reference (Deposit): SHAPIRO, L. H., AND GRIES, J. P., 1970 , ORE DEPOSITS IN ROCKS OF PALEOZOIC AND TERTIARY AGE OF THE NORTHERN BLACK HILLS, SOUTH DAKOTA, SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY.


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