Mine detail: Johnston - Moffet Copper

Previously called 'Mountain View'

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Location

Lat / long:

45.60296, -112.18837

Resource(M)

Primary:	Copper
Secondary:	Silver, Gold
Ore:	Chalcocite, Chalcopyrite, Chrysocolla, Cuprite, Malachite
Gangue:	Diopside, Garnet, Magnetite, Pyrite
Orebody form:	IRREGULAR
Discovery year:	1900

Production

Operation type:	Unknown
Deposit type:	Contact Metasomatic
Production size:	Small
Development status:	Past Producer
First production started:	1916

Geology

Host rock:	Madison
Host type:	Limestone
Associated rock:	Quartz Monzonite
Associated type:	Quartz Monzonite
Structure:	North - Striking And Northeast - Striking Faults, North - Striking Fault May Have Exerted Structural Control On Emplacement Of Qtz Monzonite Stock.
Tectonic:	Fault Block Mountain
Alteration processes:	Tactite Minerals And Pyritization

References

MRDS	W026551
DEP	10078289
Reference	{Deposit:: MBMG BULL 24, P. 26-27.}{Deposit:: ROBY, R. N., 1946 , EXPLORATION OF THE MOFFET - JOHNSTON COPPER PROPERTY, MADISON COUNTY, MONTANA: U S BUREAU OF MINES REPORT OF INVESTIGATIONS 3939 , 12 P.}{Deposit:: 1943 DIREXPL ROBY, USBM PUBLISHED REPORT}{Deposit:: 1957 COMPILE JOHNS W. M. PUBLISHED REPORT}{Production:: ROBY, 1946 , MOFFET - JOHNSTON COPPER PROPERTY, P. 2 , 3}{Reserve-Resource:: W. S. MOORE CO. AND ISO COPPER}
Reporter	Johns, Willis M.; R. B. Berg