Manganese Mines in Maryland
4Total Sites
0Active
Manganese Mining in Maryland
Maryland has 4 manganese-related mine and mineral deposit locations recorded in federal databases. None are currently listed as active, but historical records document past production and geological occurrences. Data comes from the USGS Mineral Resources Data System and MSHA Mine Safety and Health Administration records.
By County
| County | Sites |
|---|---|
| Montgomery County | 2 |
| Baltimore City County | 1 |
| Washington County | 1 |
Manganese Mines
| Mine | County | Type | Status |
|---|---|---|---|
| Brookville Mine | Montgomery | Surface | Past Producer |
| Diamond Shamrock/ Baltimore, Md. | Baltimore City | Processing Plant | Plant |
| Potomac Refining Co. Mine | Washington | Past Producer | |
| Unnamed, Near Brookville | Montgomery | Past Producer |