Madison Fissure
Past ProducerCopperSurfaceUSGS MRDS
Location
| State | Michigan |
| County | Keweenaw |
| Coordinates | 47.40833, -88.17504 |
Commodities
| Primary | Copper |
Mine Details
| Status | Past Producer |
| Type | Surface |
| First Production | 1856 |
| Last Production | 1881 |
| Data Source | USGS MRDS |
| Source ID | 10082624 |