| Oakmont MineAllegheny, PANear BarkingMSHA 3600803 | Coal (Bituminous)Underground | Abandoned and SealedStatus date: 05/01/1980 | Harmar Coal CompanyReported operatorConsolidation Coal Co & Wheeling-Pittsburgh SteelReported controller | Neither history importedView source coverage → |
| Oakridge Bluestone ISusquehanna, PANear Laurel LakeMSHA 3608820 | Dimension Stone NECSurface | AbandonedStatus date: 08/09/2005 | Oakridge BluestoneReported operatorSandra I Wood; David P WoodReported controller | Production / employmentSafety recordsView source coverage → |
| Oakridge Bluestone IVSusquehanna, PANear MontroseMSHA 3608821 | Dimension Stone NECSurface | AbandonedStatus date: 05/18/2010 | Oakridge BluestoneReported operatorSandra I Wood; David P WoodReported controller | Production / employmentSafety recordsView source coverage → |
| Oakwood BreakerSchuylkill, PAMSHA 3601932 | Coal (Bituminous)Facility | AbandonedStatus date: 01/24/1978 | Oakwood Coal Company IncReported operatorOakwood Coal Company IncReported controller | Neither history importedView source coverage → |
| Ober QuarryBradford, PANear WysoxMSHA 3609239 | Dimension Stone NECSurface | AbandonedStatus date: 09/29/2008 | M & M FlagstoneReported operatorMelvin HeemanReported controller | Production / employmentSafety recordsView source coverage → |
| O Brien StripFayette, PANear Bullskin TownshipMSHA 3606026 | Coal (Bituminous)Surface | AbandonedStatus date: 09/12/1984 | William H O'Brien & Son IncReported operatorO'Brien ThomasReported controller | Neither history importedView source coverage → |
| O B V MineNorthumberland, PANear SagonMSHA 3608495 | Coal (Anthracite)Underground | AbandonedStatus date: 12/12/1994 | West Coal CompanyReported operatorStephen PerchinskiReported controller | Neither history importedView source coverage → |
| Ocean #5 MineAllegheny, PANear SmithdaleMSHA 3605132 | Coal (Bituminous)Underground | Abandoned and SealedStatus date: 04/21/1994 | Jedco Minerals IncReported operatorMowry W ThomasReported controller | Neither history importedView source coverage → |
| O'Dell QuarrySusquehanna, PANear AlfordMSHA 3608740 | Dimension Stone NECSurface | AbandonedStatus date: 12/10/2022 | Rich Jenkins Inc.Reported operatorRichard A JenkinsReported controller | Production / employmentSafety recordsView source coverage → |
| O'Dell QuarrySusquehanna, PANear KingsleyMSHA 3609987 | Dimension Stone NECSurface | AbandonedStatus date: 08/27/2020 | Guild Flagstone IIReported operatorJohn D ReynenReported controller | Production / employmentSafety recordsView source coverage → |
| O'Donnell No 3Indiana, PANear Five PointsMSHA 3601343 | Coal (Bituminous)Underground | Abandoned and SealedStatus date: 06/09/1989 | O'Donnell Coal CompanyReported operatorRochester & Pittsburgh Coal CompanyReported controller | Neither history importedView source coverage → |
| O'Donnell No 4Indiana, PANear Five PointsMSHA 3605032 | Coal (Bituminous)Underground | AbandonedStatus date: 12/31/1985 | O'Donnell Coal CompanyReported operatorRochester & Pittsburgh Coal CompanyReported controller | Neither history importedView source coverage → |
| OGLETOWN QUARRYSomerset, PANear OgletownMSHA 3607394 | Crushed, Broken SandstoneSurface | AbandonedStatus date: 06/17/2004 | New Enterprise Stone & Lime Company IncReported operatorNew Enterprise Stone & Lime Company IncReported controller | Production / employmentSafety recordsView source coverage → |
| Ohler Farm JobSomerset, PANear MarkletonMSHA 3607100 | Coal (Bituminous)Surface | AbandonedStatus date: 08/03/1983 | Ken-Lin Coal IncReported operatorKenneth MorcheskyReported controller | Neither history importedView source coverage → |
| Ohler StripSomerset, PANear BerlinMSHA 3603331 | Coal (Bituminous)Surface | AbandonedStatus date: 09/23/1991 | C & O Coal CompanyReported operatorOhler Leo & James E CronerReported controller | Neither history importedView source coverage → |
| Ohler StripSomerset, PAMSHA 3605270 | Coal (Bituminous)Surface | AbandonedStatus date: 12/02/1980 | Better Mining IncReported operatorValeri Carl CReported controller | Neither history importedView source coverage → |
| Oil City Coal Inc StripVenango, PANear BarkeyvilleMSHA 3603358 | Coal (Bituminous)Surface | AbandonedStatus date: 08/27/1984 | Oil City Coal IncReported operatorGoetz William OReported controller | Neither history importedView source coverage → |
| Old Beebe MineBradford, PANear DurellMSHA 3609158 | Crushed, Broken Stone NECSurface | AbandonedStatus date: 06/15/2011 | B & P Inc.Reported operatorBrian M EdsallReported controller | Production / employmentSafety recordsView source coverage → |
| Old Colony StripWestmoreland, PAMSHA 3606702 | Coal (Bituminous)Surface | AbandonedStatus date: 10/14/1980 | Smith Coal CompanyReported operatorSmith Joseph FReported controller | Neither history importedView source coverage → |
| Olde Buck MineSchuylkill, PANear Buck RunMSHA 3607630 | Coal (Anthracite)Surface | AbandonedStatus date: 04/10/2019 | Olde Buck Run Coal Company IncReported operatorRobert L BowersReported controller | Production / employmentSafety recordsView source coverage → |
| Old Route 11 PitSusquehanna, PANear ?MSHA 3608062 | Construction Sand and GravelSurface | AbandonedStatus date: 09/24/1992 | Robert Treible ExcavatingReported operatorTreible RobertReported controller | Neither history importedView source coverage → |
| Olenick Brothers BreakerSchuylkill, PANear ForestvilleMSHA 3601936 | Coal (Anthracite)Facility | AbandonedStatus date: 12/04/1997 | Olenick Brothers Coal CompanyReported operatorOlenick Michael-John & NicholasReported controller | Safety recordsView source coverage → |
| Oley No 1 Quarry Berks, PANear ReadingMSHA 3600186 | CementFacility | AbandonedStatus date: 03/23/1983 | Lehigh Cement Company LLCReported operatorHeidelberg Materials AGReported controller | Neither history importedView source coverage → |
| Oley QuarryBerks, PANear ?MSHA 3603444 | Crushed, Broken Limestone NECFacility | AbandonedStatus date: 06/22/1987 | Berks Products CorpReported operatorJeff NielsenReported controller | Neither history importedView source coverage → |
| Oley Quarry #112Berks, PANear OleyMSHA 3600065 | Crushed, Broken Limestone NECSurface | AbandonedStatus date: 09/20/2016 | New Enterprise Stone and Lime Co.Reported operatorNew Enterprise Stone & Lime Company IncReported controller | Production / employmentSafety recordsView source coverage → |
| Oliveri Pit No 1Sullivan, PAMSHA 3606226 | Coal (Anthracite)Surface | AbandonedStatus date: 01/20/1981 | Quality Resources IncReported operatorQuality Resources IncReported controller | Neither history importedView source coverage → |
| Olson #1Indiana, PAMSHA 3606415 | Coal (Bituminous)Surface | AbandonedStatus date: 04/07/1980 | Oak Tree Coal CompanyReported operatorLeasure Richard AReported controller | Neither history importedView source coverage → |
| Olyphant BankLackawanna, PAMSHA 3603546 | Coal (Anthracite)Surface | AbandonedStatus date: 05/13/1980 | Carrier Coal Company IncReported operatorTomaine CarlReported controller | Neither history importedView source coverage → |
| Olyphant BreakerLackawanna, PAMSHA 3601691 | Coal (Anthracite)Facility | AbandonedStatus date: 05/06/1980 | Carrier Coal Company IncReported operatorTomaine CarlReported controller | Neither history importedView source coverage → |
| Ondo Extension MineIndiana, PANear Brush ValleyMSHA 3609005 | Coal (Bituminous)Surface | AbandonedStatus date: 06/26/2018 | Rosebud Mining CompanyReported operatorJ Clifford Forrest IIIReported controller | Production / employmentSafety recordsView source coverage → |