Montana · Madison County
Past Producer
Longfellow Mine
Madison County, Montana, United States
Gold
Silver
Lead
Copper
Arsenic
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USGS source ↗
Commodities
Primary
Gold, Silver, Lead
Secondary
Copper
Tertiary
Arsenic
Commodity type
M
Deposit
Deposit type
Vein
Deposit size
S
Workings
Underground
Ore control
Aplite
Materials
Ore minerals
Chalcopyrite, Galena
Gangue
Quartz
Geology
Host rock
Gneiss · Pre Belt
Associated rock
Granite
Structure
Boulder Batholith
Alteration
Brecciation, Oxidation
Economic & production
Development status
Past Producer
Identification
Deposit ID
10019935
MRDS ID
DC11976
Region
NA
Data score
B
Coordinates
45.60268, -112.50782
References
USGS BULL 574, P. 131.MBMG MEM 19, P. 43.CONSV. DIV. COMP. DATE, 05-22-19631914 RECON WINCHELL, A.N., US GEOL SUR BULL 5741950 GEOLMAP MBMG MEM. 19