Portland Mine

The Portland Mine is a gold mine located in Lawrence county, South Dakota at an elevation of 6,401 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: Portland Mine  

State:  South Dakota

County:  Lawrence

Elevation: 6,401 Feet (1,951 Meters)

Commodity: Gold

Lat, Long: 44.34417, -103.84389

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 Portland Mine

Portland Mine MRDS details

Site Name

Primary: Portland Mine


Commodity

Primary: Gold
Secondary: Silver


Location

State: South Dakota
County: Lawrence
District: Bald Mountain (Portland) 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
Discovery Year: 1877
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

Not available


Alterations

Not available


Rocks

Not available


Analytical Data

Not available


Materials

Ore: Gold
Ore: Silver
Gangue: Dolomite
Gangue: Pyrite


Comments

Comment (Location): CENTER OF THE NORTH EDGE OF THE SECTION

Comment (Production): SEE RECORD 'BALD MOUNTAIN MINING COMPANY'

Comment (Development): THIRTY CLAIMS

Comment (Deposit): FRACTURES RUN N 25 - 40 E

Comment (Workings): EXTENSIVE HAULAGE TUNNEL SYSTEM


References

Reference (Deposit): U.S. GEOLOGICAL SURVEY, U.S. BUREAU OF RECLAMATION, SOUTH DAKOTA GEOLOGICAL SURVEY, 1975 , MINERAL AND WATER RESOURCES OF SOUTH DAKOTA, SOUTH DAKOTA GEOLOGICAL SURVEY BULLETIN 16

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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