Mine detail: Old Ironsides Group Mine

Previously called 'The Ironside'

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Location

Lat / long:

44.38968, -103.87558

Resource(M)

Primary:	Gold, Silver
Ore:	Gold, Silver, Sylvanite

Production

Operation type:	Unknown
Deposit type:	Replacement
Production size:	Small
Development status:	Past Producer
First production started:	1899

Geology

Associated rock:	Porphyry Sill (Phonolite)
Associated type:	Porphyry
Alteration processes:	Hydrothermal Alteration Of Phonolite, Accompanied By Some Mineralization.

References

MRDS	SD02143
DEP	10104223
Reference	{Deposit:: US BUREAU OF MINES, 1954 , BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 1 , BUREAU OF MINES INFORMATION CIRCULAR 7688 .}{Deposit:: SHAPIRO, L. H., AND GRIES, J. P., 1970 , ORE DEPOSITS IN ROCKS OF PALEOZOIC AND TERTIARY AGE OF THE NORTHERN BLACK HILLS, SOUTH DAKOTA, SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY.}{Production:: US BUREAU OF MINES, 1954 , BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 1 , BUREAU OF MINES INFORMATION CIRCULAR 7688 . { SHAPIRO, L. H., AND GRIES, J. P., 1970 , ORE DEPOSITS IN ROCKS OF PALEOZOIC AND TERTIARY AGE OF THE NORTHERN BLACK HILLS, SOUTH DAKOTA, SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY}
Reporter	Barari, Rachel A.