| Ondo MineIndiana, PANear Brush ValleyMSHA 3608628 | Coal (Bituminous)Underground | Abandoned and SealedStatus date: 11/25/2002 | Mears Enterprises IncReported operatorKerry L MearsReported controller | Production / employmentSafety recordsView source coverage → |
| OneidaSchuylkill, PANear HumboldtMSHA 3605091 | Coal (Anthracite)Surface | AbandonedStatus date: 07/15/1991 | Jeddo-Highland Coal CompanyReported operatorPagnotti Enterprises IncReported controller | Neither history importedView source coverage → |
| OneidaSchuylkill, PANear OneidaMSHA 3608258 | Coal (Anthracite)Facility | AbandonedStatus date: 10/04/1991 | Pardeesville AssociatesReported operatorDe Leo FrankReported controller | Neither history importedView source coverage → |
| Oneida BankSchuylkill, PAMSHA 3604733 | Coal (Anthracite)Surface | AbandonedStatus date: 05/28/1974 | Honeybrook Mines IncReported operatorCorreale FredReported controller | Neither history importedView source coverage → |
| Oneida South Basin StripSchuylkill, PAMSHA 3606618 | Coal (Anthracite)Surface | AbandonedStatus date: 06/20/1980 | Shepco Coal CompanyReported operatorDefazio Francis SReported controller | Neither history importedView source coverage → |
| Oneida StripSchuylkill, PAMSHA 3601715 | Coal (Anthracite)Surface | AbandonedStatus date: 07/18/1974 | Booty'S Mining Company IncReported operatorLouis J BeltramiReported controller | Neither history importedView source coverage → |
| Ontario Blue RidgeLackawanna, PANear BlakelyMSHA 3606933 | Coal (Anthracite)Surface | AbandonedStatus date: 11/10/1992 | Pasternak BrothersReported operatorPasternak George-John & MichaelReported controller | Neither history importedView source coverage → |
| Ontario Strip MineLackawanna, PAMSHA 3601612 | Coal (Anthracite)Surface | AbandonedStatus date: 05/05/1980 | Pasternak BrothersReported operatorPasternak George-John & MichaelReported controller | Neither history importedView source coverage → |
| Onyon QuarrySusquehanna, PANear Gibson State Police BarracksMSHA 3609937 | Crushed, Broken SandstoneSurface | AbandonedStatus date: 06/24/2013 | Tri City Highway Products IncorporatedReported operatorMartin A Galasso JrReported controller | Production / employmentSafety recordsView source coverage → |
| Onyx Mining Inc StripSomerset, PAMSHA 3606355 | Coal (Bituminous)Surface | AbandonedStatus date: 12/02/1980 | Onyx Mining IncReported operatorNaugle FloydReported controller | Neither history importedView source coverage → |
| Opal MiningIndiana, PANear NowrytownMSHA 3606950 | Coal (Bituminous)Surface | AbandonedStatus date: 07/18/1986 | Opal MiningReported operatorFreed ClarkReported controller | Neither history importedView source coverage → |
| Orchard Hill StripArmstrong, PANear Kiskiminetas Twp.MSHA 3607494 | Coal (Bituminous)Surface | AbandonedStatus date: 10/11/1984 | Double A Coal CompanyReported operatorAltmire Brothers Coal Company IncReported controller | Neither history importedView source coverage → |
| Orchard SlopeSchuylkill, PAMSHA 3604734 | Coal (Anthracite)Underground | AbandonedStatus date: 05/08/1975 | Zakrewsky Coal Company IncReported operatorZakrewsky PeterReported controller | Neither history importedView source coverage → |
| Orchard SlopeColumbia, PAMSHA 3605559 | Coal (Bituminous)Underground | AbandonedStatus date: 03/06/1978 | A & H Coal CompanyReported operatorHarner Roy E & Delbert L ArtzReported controller | Neither history importedView source coverage → |
| Orchard SlopeSchuylkill, PANear GoodspringMSHA 3606132 | Coal (Anthracite)Underground | Abandoned and SealedStatus date: 02/10/1997 | Sunset Coal CompanyReported operatorJoseph KleemanReported controller | Safety recordsView source coverage → |
| Orchard SlopeColumbia, PANear LocustdaleMSHA 3606696 | Coal (Anthracite)Underground | Abandoned and SealedStatus date: 04/23/1985 | New Way Coal CompanyReported operatorSmith Darvin C--Allen R KramerReported controller | Neither history importedView source coverage → |
| Orchard SlopeColumbia, PANear LocustdaleMSHA 3606972 | Coal (Anthracite)Underground | Abandoned and SealedStatus date: 10/01/1985 | M & R Coal CompanyReported operatorManhart Leroy C & Michael RosemanReported controller | Neither history importedView source coverage → |
| Orchard SlopeSchuylkill, PANear LlewellynMSHA 3607596 | Coal (Anthracite)Underground | Abandoned and SealedStatus date: 10/22/1984 | C D & E Coal CompanyReported operatorMorgan Carey-Edman WinandReported controller | Neither history importedView source coverage → |
| Orchard SlopeSchuylkill, PANear GoodspringMSHA 3608806 | Coal (Anthracite)Underground | Abandoned and SealedStatus date: 01/18/2002 | Three W M U G MineReported operatorWhalen Wenrich Jr; Richard WenrichReported controller | Production / employmentSafety recordsView source coverage → |
| Orchard Slope MineSchuylkill, PANear ZerbeMSHA 3601925 | Coal (Anthracite)Underground | Abandoned and SealedStatus date: 09/10/1984 | Mountain Top Coal CompanyReported operatorVesay WilliamReported controller | Neither history importedView source coverage → |
| Orchard Slope MineSchuylkill, PANear LincolnMSHA 3601939 | Coal (Anthracite)Underground | Abandoned and SealedStatus date: 06/11/1982 | Okay Coal CompanyReported operatorHarner Leonard & JacksonReported controller | Neither history importedView source coverage → |
| Orchard Vein SlopeSchuylkill, PAMSHA 3604375 | Coal (Anthracite)Underground | AbandonedStatus date: 05/17/1973 | Herb & Tobin Coal CompanyReported operatorHerb & Tobin Coal CompanyReported controller | Neither history importedView source coverage → |
| Orchard Vein SlopeSchuylkill, PANear NewtownMSHA 3607864 | Coal (Anthracite)Underground | Abandoned and SealedStatus date: 01/20/1993 | Mountain Run EnterprisesReported operatorVesay RobertReported controller | Neither history importedView source coverage → |
| Orisik StripWestmoreland, PANear Jacobs CreekMSHA 3607252 | Coal (Bituminous)Surface | AbandonedStatus date: 09/09/1986 | Eureka Energy CompanyReported operatorCuteri Fred AReported controller | Neither history importedView source coverage → |
| Orlando No 1 StripClearfield, PAMSHA 3602760 | Coal (Bituminous)Surface | AbandonedStatus date: 04/29/1980 | Simca Mining IncReported operatorShimchock GeorgeReported controller | Neither history importedView source coverage → |
| Oruska #1Susquehanna, PANear DimockMSHA 3609536 | Dimension SlateSurface | AbandonedStatus date: 10/05/2009 | B Gregory FlagstoneReported operatorBrian K GregoryReported controller | Production / employmentSafety recordsView source coverage → |
| Osgood QuarryPotter, PANear GaletonMSHA 3609874 | Dimension Stone NECSurface | AbandonedStatus date: 05/21/2013 | Long's StoneReported operatorRoger LongReported controller | Production / employmentSafety recordsView source coverage → |
| Ostop-Schneider Borrow SiteWashington, PANear BurgettstownMSHA 3609969 | Crushed, Broken Limestone NECSurface | AbandonedStatus date: 03/05/2012 | Mountain Top Excavation LLCReported operatorAndrew Swank; Tim ZeglinReported controller | Safety recordsView source coverage → |
| O StripFayette, PANear MessmoreMSHA 3604691 | Coal (Bituminous)Surface | AbandonedStatus date: 02/24/1992 | O Coal CompanyReported operatorOberlechner Steve Jr & SrReported controller | Neither history importedView source coverage → |
| Ostrom QuarryPotter, PANear RouletteMSHA 3607925 | Dimension Stone NECSurface | AbandonedStatus date: 05/14/2008 | Robert Ostrom Reported operatorRobert H OstromReported controller | Production / employmentSafety recordsView source coverage → |