| Lat / long: | 45.60296, -112.18837 |
| Primary: | Copper |
| Secondary: | Silver, Gold |
| Ore: | Chalcocite, Chalcopyrite, Chrysocolla, Cuprite, Malachite |
| Gangue: | Diopside, Garnet, Magnetite, Pyrite |
| Orebody form: | IRREGULAR |
| Discovery year: | 1900 |
| Operation type: | Unknown |
| Deposit type: | Contact Metasomatic |
| Production size: | Small |
| Development status: | Past Producer |
| First production started: | 1916 |
| 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 |
| 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 |