South Dakota · Lawrence County
Past Producer

Portland Mine

Lawrence County, South Dakota, United States
GoldSilver
⌖ Show on mapUSGS source ↗
Commodities
PrimaryGold
SecondarySilver
Commodity typeM
Deposit
Deposit typeReplacement
Deposit sizeS
Ore controlSeries Of Major Fractures
Materials
Ore mineralsGold, Silver
GangueDolomite, Pyrite
Economic & production
Development statusPast Producer
Discovery year1877
Identification
Deposit ID10055453
MRDS IDSD02005
RegionNA
Data scoreC
Coordinates44.34413, -103.84447
References
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 16US BUREAU OF MINES, 1954 , BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART I, BUREAU OF MINES INFORMATION CIRCULAR 7688 .