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Mines in Delaware
Mines reported to the Mine Safety and Health Administration
- Mines listed
- 9
- Active
- 8
- Employees
- 76
- Accidents reported in 2025
- 1
Mines are listed from MSHA's mine data, excluding mines recorded as abandoned. Accident counts are reports filed with MSHA for the calendar year, including injuries and illnesses at the mine, and are counts only. Operator names are shown only when they are companies or agencies.
Largest mines by employees
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| Mine | Type | Status | Employees | Accidents 2025 |
|---|---|---|---|---|
| Wilmington Plant | Metal/nonmetal, Facility | Active | 27 | 0 |
| Wolman | Metal/nonmetal, Surface | Active | 10 | 1 |
| Laurel Sand Plant | Metal/nonmetal, Surface | Intermittent | 9 | 0 |
| M L Joseph Sand & Gravel Company Inc | Metal/nonmetal, Surface | Active | 9 | 0 |
| Plant #2 | Metal/nonmetal, Surface | Active | 8 | 0 |
| Tarburton Pit | Metal/nonmetal, Surface | Active | 6 | 0 |
| Seaford-De Sand & Gravel | Metal/nonmetal, Surface | Active | 3 | 0 |
| Bay Road Plant #7 | Metal/nonmetal, Surface | Active | 2 | 0 |
| Porter Sand & Gravel, Inc. | Metal/nonmetal, Surface | Active | 2 | 0 |
Source: Mine Safety and Health Administration, Open Government Data