Colorado · Boulder County
Past Producer
Alton Tunnel
Boulder County, Colorado, United States
Gold
Silver
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USGS source ↗
Commodities
Primary
Gold
Tertiary
Silver
Commodity type
M
Deposit
Model
46: W veins
Workings
Underground
Materials
Other materials
Chalcopyrite, Galena, Gold, Pyrite, Silver, Sphalerite
Economic & production
Development status
Past Producer
First production
1909
Discovery year
1900
Identification
Deposit ID
10214205
MRDS ID
DC03394
Alternate names
Pine Grove
Region
NA
Data score
E
Coordinates
39.96805, -105.5392