Alton Tunnel
Past ProducerGoldUndergroundUSGS MRDS
Location
| State | Colorado |
| County | Boulder |
| Coordinates | 39.96805, -105.53920 |
Commodities
| Primary | Gold |
| Tertiary | Silver |
Mine Details
| Status | Past Producer |
| Type | Underground |
| First Production | 1909 |
| Discovery Year | 1900 |
| Data Source | USGS MRDS |
| Source ID | 10214205 |