| Maryland Sand Gravel & Stone Company PitCecil, MDMSHA 1800312 | Construction Sand and GravelSurface | AbandonedStatus date: 09/01/1981 | Maryland Sand Gravel & Stone CompanyReported operatorMaryland Sand Gravel & Stone CompanyReported controller | Neither history importedView source coverage → |
| Mcceney Pit And PlantMontgomery, MDMSHA 1800421 | Construction Sand and GravelSurface | AbandonedStatus date: 04/28/1978 | Contee Sand & Gravel Company IncReported operatorContee Resources IncReported controller | Neither history importedView source coverage → |
| Mellott-Maryland StoneFrederick, MDNear FrederickMSHA 1800772 | Crushed, Broken Limestone NECSurface | AbandonedStatus date: 01/10/2008 | Mellott CompanyReported operatorJonathan SchilowitzReported controller | Production / employmentSafety recordsView source coverage → |
| Mellott-North East QuarryCecil, MDNear NortheastMSHA 1800786 | Crushed, Broken Stone NECSurface | AbandonedStatus date: 02/09/2015 | Mellott CompanyReported operatorJonathan SchilowitzReported controller | Production / employmentSafety recordsView source coverage → |
| MERIT BRANDYWINEPrince Georges, MDNear BrandywineMSHA 1800481 | Construction Sand and GravelSurface | AbandonedStatus date: 12/11/2002 | Merit Concrete IncorporatedReported operatorAggregate Industries PLCReported controller | Production / employmentSafety recordsView source coverage → |
| Merrick Sand and Gravel Massey PlantKent, MDNear MasseyMSHA 1800795 | Sand, Industrial NECSurface | AbandonedStatus date: 08/03/2015 | Ryan Farms LLCReported operatorRoland KarbaumReported controller | Production / employmentSafety recordsView source coverage → |
| Metro I IncorporatedBaltimore City, MDNear ?MSHA 1800683 | Crushed, Broken Stone NECFacility | AbandonedStatus date: 12/14/1983 | Metro I IncReported operatorMetro I IncReported controller | Neither history importedView source coverage → |
| Mettiki MineGarrett, MDNear OaklandMSHA 1800621 | Coal (Bituminous)Facility | Abandoned and SealedStatus date: 01/18/2012 | Mettiki Coal LLCReported operatorAlliance Resource Partners LPReported controller | Production / employmentSafety recordsView source coverage → |
| Mettiki Preperation PlantGarrett, MDNear OaklandMSHA 1800819 | Coal (Bituminous)Facility | AbandonedStatus date: 03/13/2025 | Operator not reportedReported operatorController not reportedReported controller | Neither history importedView source coverage → |
| MEYER PIT OPERATIONAnne Arundel, MDNear LothianMSHA 1800289 | Construction Sand and GravelSurface | AbandonedStatus date: 01/26/2004 | Patuxent Aggregate Processors LlcReported operatorFrancis E Gardiner IIIReported controller | Production / employmentSafety recordsView source coverage → |
| MICHAEL P. DAVIDSON PIT #2Caroline, MDNear GoldsboroMSHA 1800742 | Construction Sand and GravelSurface | AbandonedStatus date: 08/21/2001 | Mike Davidson Sand & Gravel LLCReported operatorChaney Enterprises LPReported controller | Production / employmentSafety recordsView source coverage → |
| Mine #308Garrett, MDMSHA 1800647 | Coal (Bituminous)Surface | AbandonedStatus date: 10/01/1979 | Savage Mining CompanyReported operatorBessemer Iron & Coal CompanyReported controller | Neither history importedView source coverage → |
| Mine No 1Garrett, MDMSHA 1800665 | Coal (Bituminous)Surface | AbandonedStatus date: 10/01/1981 | Central States Coal Company IncReported operatorTurner J PrestonReported controller | Neither history importedView source coverage → |
| MM & FPrince Georges, MDNear ?MSHA 1800743 | Construction Sand and GravelSurface | AbandonedStatus date: 01/22/2001 | M M & F IncReported operatorAllen J FlinchumReported controller | Production / employmentView source coverage → |
| Morgan FarmAllegany, MDNear FrostburgMSHA 1800703 | Coal (Bituminous)Surface | AbandonedStatus date: 11/06/2007 | Jones Coal IncReported operatorJones Donald FReported controller | Neither history importedView source coverage → |
| Mt. ZionGarrett, MDNear KitzmillerMSHA 1800814 | Coal (Bituminous)Surface | AbandonedStatus date: 01/18/2024 | Heritage Coal & Natural Resources, LLCReported operatorKTRV LLCReported controller | Production / employmentSafety recordsView source coverage → |
| Muirkirk MinePrince Georges, MDNear ?MSHA 1800078 | Common Clays NECSurface | AbandonedStatus date: 03/09/1994 | Cherokee Sanford BrickReported operatorWienerberger AGReported controller | Neither history importedView source coverage → |
| Murikirk PitPrince Georges, MDMSHA 1800615 | Construction Sand and GravelSurface | AbandonedStatus date: 01/02/1980 | Cherry Hill Sand & Gravel Company IncReported operatorOpenshaw James AReported controller | Neither history importedView source coverage → |
| NEW WINDSOR MDCarroll, MDNear New WindsorMSHA 1800733 | Crushed, Broken Limestone NECSurface | AbandonedStatus date: 07/16/2009 | Lehigh Cement CompanyReported operatorHeidelberg Materials AGReported controller | Production / employmentSafety recordsView source coverage → |
| No 1Garrett, MDMSHA 1800167 | Coal (Bituminous)Underground | AbandonedStatus date: 10/01/1979 | Upperman Coal CompanyReported operatorUpperman WilburReported controller | Neither history importedView source coverage → |
| No 1Allegany, MDNear Mt SavageMSHA 1800373 | Coal (Bituminous)Surface | AbandonedStatus date: 09/17/1982 | Eastern Mining Systems IncReported operatorRoss Stuart RReported controller | Neither history importedView source coverage → |
| No 12 UgAllegany, MDMSHA 1800126 | Coal (Bituminous)Underground | AbandonedStatus date: 06/28/1971 | Pine Mountain Coal CompanyReported operatorDavid RaynerReported controller | Neither history importedView source coverage → |
| No 1 AugerGarrett, MDMSHA 1800157 | Coal (Bituminous)Surface | AbandonedStatus date: 05/16/1974 | Overdroff Coal CompanyReported operatorOverdroff Paul RReported controller | Neither history importedView source coverage → |
| No 1 Drees Coal SurfaceGarrett, MDMSHA 1800498 | Coal (Bituminous)Surface | AbandonedStatus date: 10/01/1979 | Drees Coal CompanyReported operatorDrees BernardReported controller | Neither history importedView source coverage → |
| No 1 MineAllegany, MDMSHA 1800200 | Coal (Bituminous)Underground | AbandonedStatus date: 05/24/1972 | Wolf Run Coal CompanyReported operatorWolf Run Coal CompanyReported controller | Neither history importedView source coverage → |
| No 1 MineGarrett, MDMSHA 1800210 | Coal (Bituminous)Underground | AbandonedStatus date: 05/25/1972 | Cross Cut Coal CompanyReported operatorCross Cut Coal CompanyReported controller | Neither history importedView source coverage → |
| No 1 MineAllegany, MDMSHA 1800213 | Coal (Bituminous)Underground | AbandonedStatus date: 11/18/1971 | Fickes Coal CompanyReported operatorFickes Coal CompanyReported controller | Neither history importedView source coverage → |
| No 1 MineAllegany, MDNear WesternportMSHA 1800263 | Coal (Bituminous)Surface | AbandonedStatus date: 02/10/2009 | Brashear Coal MinesReported operatorRoger L Brashear; Darlene BrashearReported controller | Production / employmentSafety recordsView source coverage → |
| No 1 MineAllegany, MDNear LonaconingMSHA 1800534 | Coal (Bituminous)Surface | AbandonedStatus date: 08/11/2011 | Clise Coal Company IncReported operatorCharles T Clise JrReported controller | Production / employmentSafety recordsView source coverage → |
| No 1 MineAllegany, MDNear MidlandMSHA 1800543 | Coal (Bituminous)Surface | AbandonedStatus date: 02/07/1986 | Wilhelm Coal IncReported operatorWilhelm GilbertReported controller | Neither history importedView source coverage → |