| Lost Creek PitColumbia, ORMSHA 3502584 | Crushed, Broken TraprockSurface | AbandonedStatus date: 11/26/1979 | Columbia West Materials & Constructors IncReported operatorColumbia West Resources CorpReported controller | Neither history importedView source coverage → |
| Lost Creek PitLane, ORMSHA 3502738 | Crushed, Broken TraprockSurface | AbandonedStatus date: 02/07/1979 | Mobile Crushing CompanyReported operatorLonny BessettReported controller | Neither history importedView source coverage → |
| Lost Flat MineJosephine, ORMSHA 3503102 | Gold OreSurface | AbandonedStatus date: 06/27/1983 | Lost Flat MiningReported operatorLost Flat MiningReported controller | Neither history importedView source coverage → |
| Lostine State PitWallowa, ORMSHA 3502364 | Crushed, Broken TraprockSurface | AbandonedStatus date: 07/07/1978 | Wallowa County Road DepartmentReported operatorWallowa County Road DepartmentReported controller | Neither history importedView source coverage → |
| Lost Lode #2 Lost Lode #3 Lost Lode #4Jackson, ORMSHA 3503121 | Beryl-Beryllium OreSurface | AbandonedStatus date: 10/09/1984 | Lick Gulch Mining AssociationReported operatorLick Gulch Mining AssociationReported controller | Neither history importedView source coverage → |
| Lowe Creek PitClackamas, ORMSHA 3502859 | Crushed, Broken TraprockSurface | AbandonedStatus date: 04/29/1985 | Sierra Cascade Equipment IncReported operatorMorgan Gertrude JReported controller | Neither history importedView source coverage → |
| Lowland PitsKlamath, ORNear Klamath fallsMSHA 3503320 | Crushed, Broken Stone NECSurface | AbandonedStatus date: 09/03/2004 | Jefferson State Rock Products IncReported operatorPete O'NeilReported controller | Production / employmentSafety recordsView source coverage → |
| L T Crusher #1Multnomah, ORMSHA 3503348 | Crushed, Broken Stone NECSurface | AbandonedStatus date: 02/06/1992 | L T Contractors IncReported operatorBabler Brothers IncReported controller | Neither history importedView source coverage → |
| L & T QuarryBenton, ORMSHA 3500962 | Crushed, Broken TraprockSurface | AbandonedStatus date: 07/01/1987 | Ferguson Logging CompanyReported operatorR Gary FergusonReported controller | Neither history importedView source coverage → |
| Luckiamute PitPolk, ORMSHA 3502477 | Crushed, Broken TraprockSurface | AbandonedStatus date: 05/21/1982 | Boise Cascade CorpReported operatorMiller Jon HReported controller | Neither history importedView source coverage → |
| Lucky Seven MineGrant, ORMSHA 3502567 | Gold OreSurface | AbandonedStatus date: 01/17/1979 | Smith EnterprisesReported operatorSmith EnterprisesReported controller | Neither history importedView source coverage → |
| Lucky Strike MineCrook, ORMSHA 3503097 | GemstonesSurface | AbandonedStatus date: 10/19/1983 | Valley View Mines IncReported operatorValley View Mines IncReported controller | Neither history importedView source coverage → |
| Ludlum PitCurry, ORMSHA 3502923 | Crushed, Broken TraprockSurface | AbandonedStatus date: 07/14/1980 | Ferry Creek Rock & Concrete IncReported operatorCurry John KReported controller | Neither history importedView source coverage → |
| Lull QuarryJackson, ORNear Central PointMSHA 3500618 | Crushed, Broken Stone NECSurface | AbandonedStatus date: 12/13/2019 | Wilbur LullReported operatorWilbur LullReported controller | Production / employmentSafety recordsView source coverage → |
| Lunstedt QuarryLincoln, ORMSHA 3502556 | Crushed, Broken TraprockSurface | AbandonedStatus date: 04/29/1985 | D C & L H Lunstedt CompanyReported operatorD C & L H Lunstedt CompanyReported controller | Neither history importedView source coverage → |
| Mack M Slate QuarryLinn, ORMSHA 3503359 | Crushed, Broken Stone NECSurface | AbandonedStatus date: 04/15/1996 | Mack M Slate IncReported operatorSlate Mack MReported controller | Neither history importedView source coverage → |
| Maco PitLincoln, ORMSHA 3502791 | Crushed, Broken TraprockSurface | AbandonedStatus date: 09/04/1986 | Braxling & Braxling IncReported operatorRonald D BraxlingReported controller | Neither history importedView source coverage → |
| MacwoodJackson, ORMSHA 3503128 | Gold OreSurface | AbandonedStatus date: 04/02/1985 | Dyna-Mill Int LtdReported operatorPouliot CurtisReported controller | Neither history importedView source coverage → |
| Madras Pit And PlantJefferson, ORMSHA 3502600 | Crushed, Broken TraprockSurface | AbandonedStatus date: 08/26/1985 | Deschutes Ready MixReported operatorEric W CoatsReported controller | Neither history importedView source coverage → |
| Main P. P.Coos, ORNear NorthbendMSHA 3503296 | Crushed, Broken Stone NECSurface | AbandonedStatus date: 02/27/2025 | Main Rock Products IncReported operatorMichael P Main; Craig A MainReported controller | Production / employmentSafety recordsView source coverage → |
| Malheur QueenBaker, ORNear BroganMSHA 3503799 | Gold OreSurface | AbandonedStatus date: 07/22/2016 | Queen Resources, LLCReported operatorEdward B Rich; Jeffrey D ClarkReported controller | Production / employmentSafety recordsView source coverage → |
| Mandrones Mine & MillClackamas, ORMSHA 3500254 | Common ShaleFacility | AbandonedStatus date: 09/10/1981 | C P S Mining CompanyReported operatorClaussen JackReported controller | Neither history importedView source coverage → |
| Mari-Linn Pit & PlantLinn, ORMSHA 3500987 | Construction Sand and GravelSurface | AbandonedStatus date: 08/29/1983 | Riverside Rock IncReported operatorStadeli Norman LReported controller | Neither history importedView source coverage → |
| Marple GravelLane, ORNear CreswellMSHA 3503577 | Crushed, Broken Stone NECSurface | AbandonedStatus date: 07/20/2003 | Nathan Marple ExcavationReported operatorNathan MarpleReported controller | Production / employmentSafety recordsView source coverage → |
| MARPLE SAND and GRAVELLane, ORNear CreswellMSHA 3503714 | Sand, CommonSurface | AbandonedStatus date: 10/15/2024 | Marple Sand and GravelReported operatorNathan MarpleReported controller | Production / employmentSafety recordsView source coverage → |
| MarthaJosephine, ORMSHA 3503318 | Gold OreUnderground | AbandonedStatus date: 03/08/1991 | Dragon'S Gold IncReported operatorSchreiber James H MReported controller | Neither history importedView source coverage → |
| Martha MineJosephine, ORNear Wolf CreekMSHA 3503551 | Gold OreUnderground | AbandonedStatus date: 03/10/2003 | Dutch Mining LlcReported operatorRendata Llc; Bruce BurrowReported controller | Safety recordsView source coverage → |
| Martha MineJosephine, ORNear Grants PassMSHA 3503826 | Gold OreUnderground | AbandonedStatus date: 12/10/2024 | Summitt Mining, LLCReported operatorScott R NelsonReported controller | Production / employmentSafety recordsView source coverage → |
| Marysville ClaimGrant, ORMSHA 3503094 | Gold OreSurface | AbandonedStatus date: 09/14/1983 | Immanuel Mining EnterprisesReported operatorImmanuel Mining EnterprisesReported controller | Neither history importedView source coverage → |
| Material Source 30-3-5Umatilla, ORMSHA 3502607 | Crushed, Broken TraprockSurface | AbandonedStatus date: 09/10/1979 | Stan Schnell ContractorReported operatorStan Schnell ContractorReported controller | Neither history importedView source coverage → |