Checked
Mines in Maryland
Mines reported to the Mine Safety and Health Administration
- Mines listed
- 75
- Active
- 59
- Employees
- 1,270
- Accidents reported in 2025
- 35
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
Swipe the table sideways to see more columns.
| Mine | Type | Status | Employees | Accidents 2025 |
|---|---|---|---|---|
| Union Bridge MD | Metal/nonmetal, Facility | Active | 175 | 5 |
| Amrize Hagerstown Facility | Metal/nonmetal, Facility | Active | 106 | 5 |
| Havre De Grace Quarry | Metal/nonmetal, Surface | Active | 74 | 4 |
| S W Barrick & Sons | Metal/nonmetal, Surface | Active | 56 | 1 |
| Savage Stone | Metal/nonmetal, Surface | Active | 54 | 0 |
| Mettiki General | Coal, Facility | Active | 42 | 3 |
| Casselman Mine | Coal, Underground | Active | 39 | 3 |
| Texas Quarry | Metal/nonmetal, Surface | Active | 38 | 1 |
| Job #3 | Coal, Surface | Active | 35 | 1 |
| Elk Mills Quarry | Metal/nonmetal, Surface | Active | 32 | 0 |
| Frederick Quarry | Metal/nonmetal, Surface | Active | 32 | 1 |
| North East Quarry | Metal/nonmetal, Surface | Active | 31 | 0 |
| Laurel Hill Quarry | Metal/nonmetal, Surface | Active | 29 | 0 |
| Belvedere Plant | Metal/nonmetal, Surface | Active | 28 | 6 |
| Frederick Quarry | Metal/nonmetal, Surface | Active | 27 | 1 |
| Principio Quarry | Metal/nonmetal, Surface | Active | 25 | 0 |
| Amrize Rockville Quarry | Metal/nonmetal, Surface | Active | 24 | 0 |
| Gudelsky Materials | Metal/nonmetal, Surface | Active | 24 | 0 |
| Amrize Accokeek Sand & Gravel | Metal/nonmetal, Surface | Active | 23 | 0 |
| Carderock Quarries | Metal/nonmetal, Surface | Active | 22 | 0 |
| Cabin Run | Coal, Surface | Active | 20 | 1 |
| Beaver Creek Quarry | Metal/nonmetal, Surface | Active | 18 | 0 |
| Churchville Quarry | Metal/nonmetal, Surface | Active | 18 | 0 |
| Pinesburg Quarry | Metal/nonmetal, Surface | Active | 17 | 0 |
| Bedrock Quarry | Metal/nonmetal, Surface | Active | 16 | 0 |
| Thayerville Mine | Metal/nonmetal, Underground | Active | 15 | 0 |
| Cobra No 1 | Coal, Surface | Active | 14 | 0 |
| Medford Quarry | Metal/nonmetal, Surface | Active | 14 | 0 |
| Waldorf-MD Sand & Gravel | Metal/nonmetal, Surface | Active | 14 | 0 |
| Mechanicsville-MD Sand & Gravel | Metal/nonmetal, Surface | Active | 13 | 1 |
| Cecil Plant | Metal/nonmetal, Surface | Active | 11 | 1 |
| Perryville Plant | Metal/nonmetal, Surface | Active | 11 | 0 |
| Boonsboro Quarry | Metal/nonmetal, Surface | Active | 10 | 0 |
| Chesapeake Minerals | Metal/nonmetal, Surface | Active | 10 | 0 |
| Amrize Kirby Road Sand & Gravel | Metal/nonmetal, Surface | Active | 9 | 0 |
| Bridgetown Sand & Gravel | Metal/nonmetal, Surface | Active | 8 | 0 |
| No 1 Strip | Coal, Surface | Active | 8 | 0 |
| Faulkner Site | Metal/nonmetal, Surface | Active | 7 | 0 |
| Merrick Sand & Gravel | Metal/nonmetal, Surface | Active | 7 | 1 |
| Frederick Grinding Plant | Metal/nonmetal, Facility | Active | 6 | 0 |
| Harwood-MD Sand & Gravel | Metal/nonmetal, Surface | Active | 6 | 0 |
| Koontz | Coal, Surface | Active | 6 | 0 |
| Midland Mine | Coal, Surface | Active | 6 | 0 |
| Smith 301 Pitt | Metal/nonmetal, Facility | Active | 6 | 0 |
| Zimmerman Mine | Metal/nonmetal, Surface | Active | 6 | 0 |
| Ingleside Pit | Metal/nonmetal, Surface | Active | 5 | 0 |
| No. 3 Airport Job | Coal, Surface | Active | 5 | 0 |
| Patapsco Natural Stone Quarry LLC | Metal/nonmetal, Surface | Active | 5 | 0 |
| Rosser Pit | Metal/nonmetal, Surface | Active | 5 | 0 |
| Bedrock Enterprises Inc | Metal/nonmetal, Surface | Temporarily Idled | 4 | 0 |
| Furnace Bay Plant | Metal/nonmetal, Surface | Active | 4 | 0 |
| Kent Sand & Gravel Quarry | Metal/nonmetal, Surface | Active | 4 | 0 |
| Loveville-MD Sand & Gravel | Metal/nonmetal, Surface | Intermittent | 4 | 0 |
| Mardela Springs-MD SG | Metal/nonmetal, Surface | Active | 4 | 0 |
| No. 4 Woodyard Job | Coal, Surface | Active | 4 | 0 |
| Piney Reclamation | Metal/nonmetal, Surface | Active | 4 | 0 |
| #1 Strip | Coal, Surface | Active | 3 | 0 |
| Dependable Contracting Co Inc | Metal/nonmetal, Surface | Intermittent | 3 | 0 |
| Disney Sand & Gravel LLC | Metal/nonmetal, Surface | Active | 3 | 0 |
| Kpi-Jci 4250 | Metal/nonmetal, Surface | Temporarily Idled | 3 | 0 |
| M & S Stone Quarries Inc | Metal/nonmetal, Surface | Active | 3 | 0 |
| Maryland Minerals | Metal/nonmetal, Surface | Active | 3 | 0 |
| McConchie / Smokey Rock | Metal/nonmetal, Surface | Intermittent | 3 | 0 |
| Henderson-MD Sand & Gravel | Metal/nonmetal, Surface | Intermittent | 2 | 0 |
| Jackson | Coal, Surface | Active | 2 | 0 |
| Jackson Mountain | Coal, Surface | Temporarily Idled | 2 | 0 |
| Sand Bank Quarry | Metal/nonmetal, Surface | Temporarily Idled | 2 | 0 |
| Butler Artcraft Stone Corporation | Metal/nonmetal, Surface | Intermittent | 1 | 0 |
Other mines
No employees reported
- Carlos Surface · Temporarily Idled
- Midland · Temporarily Idled
- Russell Farm · New Mine
- Target#3 · New Mine
- Taylor Lower Bakerstown · Temporarily Idled
- Tipple No.1 · Temporarily Idled
- Walker Mine · Temporarily Idled
Source: Mine Safety and Health Administration, Open Government Data