Mass Fissure
Past ProducerCopperUndergroundUSGS MRDS
Location
| State | Michigan |
| County | Keweenaw |
| Coordinates | 47.29306, -88.37644 |
Commodities
| Primary | Copper |
Mine Details
| Status | Past Producer |
| Type | Underground |
| First Production | 1909 |
| Last Production | 1925 |
| Data Source | USGS MRDS |
| Source ID | 10082617 |