Mine detail: Helena Mine

Previously called ''

<< Back to the map

Location

Lat / long:

45.12457, -116.6418

Resource(M)

Primary:	Gold, Silver, Copper
Tertiary:	Molybdenum, Tungsten
Ore:	Bornite, Powellite, Scheelite
Gangue:	Albite, Epidote, Pyroxene, Quartz, Scapolite, Zoisite
Orebody form:	IRREGULAR, TABULAR, POCKETS, BUNCHES
Discovery year:	1887

Production

Operation type:	Underground
Deposit type:	Contact Metamorphic
Production size:	Small
Development status:	Past Producer

Geology

Host rock:	Martin Bridge Limestone-Tactite, Limestone, Argillaceous Beds;Tactite
Host type:	Skarn (Tactite)
Associated rock:	Quartz Diorite;Seven Devils Volcanics-Greenstones
Associated type:	Diorite
Structure:	Doubly Plunging Anticlinal Uplifts Separated By A Syncline.
Tectonic:	Island Arc Volcanic Chain
Alteration processes:	Oxidation, Sericitization

References

MRDS	W012795
MAS	160030007
DEP	10070105
Reference	{Deposit:: Cook, E. F., 1954, Mining Geology Of The Seven Devils Region: Idaho Bureau Of Mines And Geology Pamphlet 97, 22 P.}{Deposit:: Livingston, D. C., And Laney, F. B., 1920, The Copper Deposits Of The Seven Devils And Adjacent Districts: Idaho Bureau Of Mines And Geology Bulletin 1, P. 75 - 76}{Deposit:: 1920 Compile Idaho Bureau Of Mines And Geology, Bulletin 1}{Deposit:: 1954 Geolmap Idaho Bureau Of Mines And Geol., Pamphlet 97}{Geology:: Cannon, R.S. and Grimaldi, F.S, Lindgrenite and Cuprotungstite From the Seven Devils District, Idaho. (http://www.minsocam.org/ammin/AM38/AM38_903.pdf)}{Production:: Cook, E. F., 1954, Idaho Bureau Of Mines And Geol., Pamphlet 97, 22 P. Livingston, D.C., And Laney, F.B., 1920, Idaho Bur Mines And Geology Bulletin 1, P. 75.}
Reporter	Benjamin, David A.; Miller, Pat, Winters, Dick