Mine detail: Union Mine

Previously called 'Golden Reward Group'

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Location

Lat / long:

44.32357, -103.79919

Resource(M)

Primary:	Gold, Silver
Ore:	Gold, Silver

Production

Operation type:	Unknown
Deposit type:	Replacement
Production size:	Small
Development status:	Past Producer

Geology

Associated rock:	Sugarloaf Sill (Phonolite)
Associated type:	Phonolite
Structure:	Dikes And Minor Faults One Fault To The West Of The Main Workings Has 300 Ft Downthrow.

References

MRDS	SD02139
DEP	10104222
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.}
Reporter	Barari, Rachel A.