Old Mass
Past ProducerUndergroundUSGS MRDS
Location
| State | Michigan |
| County | Ontonagon |
| Coordinates | 46.81390, -89.10757 |
Commodities
| Tertiary | Copper, Silver |
Mine Details
| Status | Past Producer |
| Type | Underground |
| First Production | 1857 |
| Discovery Year | 1856 |
| Data Source | USGS MRDS |
| Source ID | 10243231 |