Montana · Fergus County
Past Producer
Maginnis Mine
Fergus County, Montana, United States
Gold
Silver
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USGS source ↗
Commodities
Primary
Gold
Secondary
Silver
Commodity type
M
Deposit
Deposit type
Au-Ag-Te vein
Model
84: Alkaline Au-Te (Au-Ag-Te veins)
Deposit size
Y
Workings
Underground
Ore control
Limestone - Syenite Porphyry Contact
Materials
Ore minerals
Gold, Telluride, Argentite
Gangue
Calcite, Fluorite
Geology
Host rock
Syenite,Limestone · Madison Series, Massive Limestone
Associated rock
Syenite · Gold Hill Syenite Porphyry
Structure
Domal Structures Resulting From Igneous Intrusions, Gold Hill Syenite Porphyry Intrusion
Tectonic setting
Rocky Mountain Foreland
Economic & production
Development status
Past Producer
First production
1881
Discovery year
1880
Identification
Deposit ID
10071340
MRDS ID
W014674
Region
NA
Data score
B
Coordinates
47.17659, -109.21968
References
ROBERTSON, A. F., 1950, MINES AND MINERAL DEPOSITS, FERGUS COUNTY, MONT.: U.S. BUREAU OF MINES INF. CIRC. 754