Fissure Mines
Past ProducerCopperUSGS MRDS
Location
| State | Michigan |
| County | Keweenaw, Houghton, Ontonagon |
| Coordinates | 47.36750, -88.32310 |
Commodities
| Primary | Copper |
| Secondary | Silver |
| Tertiary | Arsenic |
Mine Details
| Status | Past Producer |
| First Production | 1890 |
| Discovery Year | 1845 |
| Data Source | USGS MRDS |
| Source ID | 10310197 |