Mine detail: Hoodoo - Union Hill Mine

Previously called 'Eureka Mine'

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Location

Lat / long:

44.33163, -103.67557

Resource(M)

Primary:	Silver, Gold
Ore:	Gold, Silver
Gangue:	Limonite, Pyrite

Production

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

Geology

Host type:	Quartz Monzonite
Associated rock:	Quartz Monzonite Porphyry
Associated type:	Quartz Monzonite
Alteration processes:	Pyrite Cementing Material Oxidized To Limestone Near Surface

References

MRDS	SD02110
DEP	10055538
Reference	{Deposit:: US BUREAU OF MINES, 1954 , BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART I, BUREAU OF MINES INFORMATION CIRCULAR 7688 .}{Deposit:: US GEOLOGICAL SURVEY, US BUREAU OF RECLAMATION, AND SOUTH DAKOTA GEOLOGICAL SURVEY, 1975 , MINERAL AND WATER RESOURCES OF SOUTH DAKOTA, SOUTH DAKOTA GEOLOGICAL SURVEY BULLETIN 16 .}{Production:: US BUREAU OF MINES, 1954 , BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART I, BUREAU OF MINES INFORMATION CIRCULAR 7688 US GEOLOGICAL SURVEY, US BUREAU OF RECLAMATION, AND SOUTH DAKOTA GEOLOGICAL SURVEY, 1975 , MINERAL AND WATER RESOURCES OF SOUTH DAKOTA, SOUTH DAKOTA GEOLOGICAL SURVEY BULLETIN 16}
Reporter	Barari, Rachel A.