Two Johns Mine

The Two Johns Mine is a gold and silver mine located in Lawrence county, South Dakota at an elevation of 6,201 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: Two Johns Mine  

State:  South Dakota

County:  Lawrence

Elevation: 6,201 Feet (1,890 Meters)

Commodity: Gold, Silver

Lat, Long: 44.35694, -103.86056

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 Two Johns Mine

Two Johns Mine MRDS details

Site Name

Primary: Two Johns Mine
Secondary: Rua Group Mine


Commodity

Primary: Gold
Primary: Silver


Location

State: South Dakota
County: Lawrence
District: Bald Mountain District


Land Status

Land ownership: National Forest
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.
Administrative Organization: Black Hills National Forest


Holdings

Not available


Workings

Not available


Ownership

Owner Name: Bald Mountain Mining Co.


Production

Not available


Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Replacement
Operation Type: Unknown
Year First Production: 1897
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: North Trending Fault With 500 Ft. Throw


Alterations

Not available


Rocks

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

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

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

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


Analytical Data

Not available


Materials

Ore: Silver
Ore: Gold


Comments

Comment (Production): PRESENT OPERATORS PRODUCED 90 TONS OF ORE PER DAY FROM THE LOWER LEVEL UNTIL JUNE 1942 .

Comment (Development): 12 CLAIMS

Comment (Geology): THE PORPHYRY SILL WHICH IS 500 FEET THICK HAS BEEN INTRUDED BENEATH THE QUARTZITE, RAISING THE ENTIRE ORE BODY THAT MUCH. WEST OF THE NORTH-TRENDING THE SILL IS MISSING, AND THE ORE BODY LIES 500 FEET LOWER.

Comment (Location): N 1/2


References

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


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