Mine detail: Letterman Mine

Previously called 'Montana Premier Mine'

<< Back to the map

Location

Lat / long: 47.42849, -114.89543

Resource(M)

Primary: Gold
Secondary: Lead, Silver
Tertiary: Copper
Ore: Galena, Gold
Gangue: Quartz, Siderite
Orebody form: POD/LENS

Production

Operation type: Unknown
Production size: Small
Development status: Past Producer
First production started: 1911
Last production ended: 1940

Geology

Host rock:Prichard Formation
Host type:Argillite
Associated rock:Belt Series Intrusives
Associated type:Diorite
Structure:Broad Folds In The Argillites Which Strike About N., Fine Grained Dioritic Sill Is Exposed At The Adit Portal. Massive Fault, Six Ft Wide, Which Trends N 32 Deg W And Dips 72 Deg Sw.
Tectonic:Belt Basin

References

MRDSDC08401
DEP10019046
Reference{Analytical Data:: SRC.REF: CROWLEY, F. A., 1963 , MONTANA BUREAU OF MINES AND GEOLOGY BULL. 34 , P. 26}{Deposit:: MONT. BUREAU OF MINES & GEOL. BULL. 33, 1963, P. 30}{Deposit:: MONT. BUREAU OF MINES & GEOL. MEM. 31, 1950, P. 92}{Deposit:: CROWLEY, F. A., 1963 , MINES AND MINERAL DEPOSITS (EXCEPT FUELS) SANDERS COUNTY, MONTANA: MONTANA BUREAU OF MINES AND GEOLOGY, BULL. 34 , PP. 25 - 26 .}{Deposit:: GILBERT, F. C., 1935 , DIRECTORY OF MONTANA MINING PROPERTIES: MONTANA BUREAU OF MINES AND GEOLOGY MEM. 15 , P. 70 .}{Production:: CROWLEY, F. A., 1963 : MONTANA BUREAU OF MINES AND GEOLOGY BULL. 34 , PP. 25 - 26 .}
ReporterUnknown, Rojstaczer, Stuart A.