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
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.
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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