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
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.
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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