| Lat / long: | 47.4569, -87.86503 |
| Tertiary: | Manganese |
| Discovery year: | 1881 |
| Operation type: | Underground |
| Development status: | Past Producer |
| First production started: | 1881 |
| MAS | 260830004 |
| DEP | 10194276 |
| Reference | CONFIDENTIAL FILES, WAR MINERALS EXAMINATIONS,CLARK MINE, MI |
| Reporter | Eastern Field Operations Center (EFOC) |