Commodities
PrimaryGold
SecondarySilver
Commodity typeM
Deposit
Deposit typeStratabound
Deposit sizeS
WorkingsUnderground
Orebody formORE BODIES ARE IRREGULAR PIPELIKE STRUCTURES
Ore control1. A Sulfide-Bearing Phase Of The Homestake Formation { 2. Cross Folds { 3. Proximity To Garnet Isograd
Materials
Ore mineralsGold
GangueChlorite, Pyrite, Pyrrhotite
Geology
Host rockIron Formation
Associated rockPlutonic Rock
StructureBlack Hills, The Rocks Are In A Set Of Large Isoclina Folds That Have Been Refolded By Two Sets Of Smaller Folds, Which Result In Extremely Complex Configurations. Also Warping Is Caused By Tertiary Igneous Rocks And The Dome Formed Around The Cutting Stock, Exposed West Of Lead. Ore Bodies Are Located In The Younger Set Of Crossfolds.
Economic & production
Development statusProducer
Discovery year1875
Identification
Deposit ID10106953
MRDS IDSD01966
RegionNA
Data scoreB
Coordinates44.35607, -103.76501
References
U. S. GEOLOGICAL SURVEY, U. S. BUREAU OF RECLAMATION, AND SOUTH DAKOTA GEOLOGICAL SURVEY, 1975 , MINERAL AND WATER RESOURCES OF SOUTH DAKOTA, SOUTH DAKOTA GEOLOGICAL SURVEY BULLETIN 16ROBERTS, W. L., AND RAPP, GEORGE, 1965 , MINERALOGY OF THE BLACK HILLS, SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY BULLETIN 18