| Nine Mile Lake ProjectNatrona, WYMSHA 4801119 | Uranium OreFacility | AbandonedStatus date: 09/13/1983 | Rocky Mountain Energy CompanyReported operatorRocky Mt Energy Co-Mono Power Co-Halliburton CoReported controller | Neither history importedView source coverage → |
| Noble CrusherSublette, WYNear PinedaleMSHA 4801692 | Construction Sand and GravelSurface | AbandonedStatus date: 06/02/2009 | Noble Construction IncReported operatorJ Mark Noble; Susan G NobleReported controller | Production / employmentSafety recordsView source coverage → |
| Noble ScreenSublette, WYNear PinedaleMSHA 4801693 | Construction Sand and GravelSurface | AbandonedStatus date: 01/01/2015 | Noble Construction IncReported operatorJ Mark Noble; Susan G NobleReported controller | Production / employmentSafety recordsView source coverage → |
| Nordberg 5-3440Campbell, WYNear GilletteMSHA 4801677 | Construction Sand and GravelSurface | AbandonedStatus date: 07/20/2007 | Hettinger LLCReported operatorMark D HettingerReported controller | Production / employmentSafety recordsView source coverage → |
| NORDBERG HP 300Natrona, WYNear CasperMSHA 4801514 | Construction Sand and GravelSurface | AbandonedStatus date: 09/15/2003 | Scherer Construction LlcReported operatorTim Scherer; Ken SchererReported controller | Production / employmentSafety recordsView source coverage → |
| North Antelope MineCampbell, WYNear GilletteMSHA 4801336 | Coal (Bituminous)Surface | Abandoned and SealedStatus date: 10/12/1982 | North Antelope Coal CompanyReported operatorPowder River Coal Co & Pan Eastern Coal CoReported controller | Neither history importedView source coverage → |
| North Antelope MineCampbell, WYNear WrightMSHA 4801375 | Coal (Bituminous)Surface | AbandonedStatus date: 04/01/1998 | Powder River Coal CompanyReported operatorHanson PLCReported controller | Neither history importedView source coverage → |
| North Block MineLincoln, WYNear West Of FrontierMSHA 4801192 | Coal (Bituminous)Surface | Abandoned and SealedStatus date: 03/14/1985 | Pittsburg & Midway Coal Mining CompanyReported operatorChevron CorporationReported controller | Neither history importedView source coverage → |
| North Fork PitPark, WYMSHA 4801467 | Construction Sand and GravelSurface | AbandonedStatus date: 09/23/1987 | Wapiti Marble CompanyReported operatorWapiti Marble CompanyReported controller | Neither history importedView source coverage → |
| North Morton ShaftConverse, WYMSHA 4801103 | Uranium OreUnderground | AbandonedStatus date: 03/10/1978 | Harrison Western CorpReported operatorLilley F J CReported controller | Neither history importedView source coverage → |
| North PitAlbany, WYMSHA 4801443 | Construction Sand and GravelSurface | AbandonedStatus date: 08/03/1987 | Sterling Sand & Gravel Company Of WyomingReported operatorKoppers Co Inc & Redland PlcReported controller | Neither history importedView source coverage → |
| North Platte MineConverse, WYMSHA 4801366 | Uranium OreFacility | AbandonedStatus date: 01/19/1983 | Uranium Resources IncReported operatorUranium Resources IncReported controller | Neither history importedView source coverage → |
| North Stucco MineBig Horn, WYMSHA 4800863 | Common Clays NECSurface | AbandonedStatus date: 06/02/1978 | Wyo-Ben IncReported operatorDavid BrownReported controller | Neither history importedView source coverage → |
| North Tisdale Shaft No 1Johnson, WYNear KayceeMSHA 4801147 | Oil ShaleUnderground | AbandonedStatus date: 01/16/2008 | Hilcorp Energy CompanyReported operatorJeff HildebrandReported controller | Production / employmentSafety recordsView source coverage → |
| Nubeth Joint Venture In-Situ Uranium MinCrook, WYMSHA 4801228 | Uranium OreUnderground | AbandonedStatus date: 02/13/1980 | Nuclear Dynamics IncReported operatorNuclear Dynamics IncReported controller | Neither history importedView source coverage → |
| N-VamHot Springs, WYMSHA 4801120 | LimeSurface | AbandonedStatus date: 09/24/1979 | N-VamReported operatorJellis JamesReported controller | Neither history importedView source coverage → |
| Oftedal Crusher #2Natrona, WYNear CasperMSHA 2402340 | Construction Sand and GravelSurface | AbandonedStatus date: 11/08/2017 | Oftedal Construction, Inc.Reported operatorEH Oftedal & Sons IncReported controller | Production / employmentSafety recordsView source coverage → |
| Old Gold MineWeston, WYMSHA 4801101 | Fire ClaySurface | AbandonedStatus date: 04/03/1978 | American Colloid Company Minerals GroupReported operatorMinerals Technologies IncReported controller | Neither history importedView source coverage → |
| Opal Screening PlantLincoln, WYMSHA 4801358 | Construction Sand and GravelSurface | AbandonedStatus date: 06/08/1987 | Opal Construction Company IncReported operatorOpal Construction Company IncReported controller | Neither history importedView source coverage → |
| Open Pit Sections (28-33)(3-10)Converse, WYMSHA 4801158 | Uranium OreSurface | AbandonedStatus date: 05/22/1981 | Kerr-Mc Gee Nuclear CorpReported operatorKerr-McGee CorpReported controller | Neither history importedView source coverage → |
| Orin Junction PitConverse, WYMSHA 4801241 | Construction Sand and GravelSurface | AbandonedStatus date: 06/11/1980 | Gilpatrick Construction Company IncReported operatorRichard GilpatrickReported controller | Neither history importedView source coverage → |
| Osage Field ProjectWeston, WYNear OsageMSHA 4801706 | Oil MiningUnderground | AbandonedStatus date: 03/03/2010 | Rock Well Petroleum (U.S.), IncReported operatorRich Couilard; Joe McPhieReported controller | Production / employmentSafety recordsView source coverage → |
| Osage MineWeston, WYMSHA 4800619 | Kaolin and Ball ClaySurface | AbandonedStatus date: 06/06/1978 | Federal Bentonite Div/Aurora Metal CompanyReported operatorPanhandle Eastern CorpReported controller | Neither history importedView source coverage → |
| Ostlund PitCampbell, WYMSHA 4801204 | Crushed, Broken Stone NECSurface | AbandonedStatus date: 10/22/1980 | Campbell County Road & Bridge DepartmentReported operatorCampbell County-WyReported controller | Neither history importedView source coverage → |
| Owens Creek PitSheridan, WYMSHA 4801259 | Construction Sand and GravelSurface | AbandonedStatus date: 09/21/1979 | Gilpatrick Construction Company IncReported operatorRichard GilpatrickReported controller | Neither history importedView source coverage → |
| Owen'S PitPlatte, WYMSHA 4801155 | Construction Sand and GravelSurface | AbandonedStatus date: 11/15/1979 | Teton Construction CompanyReported operatorEdward L HaakReported controller | Neither history importedView source coverage → |
| Owl Creek PitHot Springs, WYMSHA 4801426 | Construction Sand and GravelSurface | AbandonedStatus date: 09/03/1985 | Prince IncReported operatorBonnie Prince; John PrinceReported controller | Neither history importedView source coverage → |
| Paradise Road Gravel PitSublette, WYNear SubletteMSHA 4801584 | Construction Sand and GravelSurface | AbandonedStatus date: 09/16/2003 | M & N Equipment LLCReported operatorNeil A McMurray; John W MartinReported controller | Production / employmentSafety recordsView source coverage → |
| Park County Sand And Gravel PitPark, WYMSHA 4801017 | Construction Sand and GravelSurface | AbandonedStatus date: 08/03/1978 | Harris Trucking & Construction CompanyReported operatorRoger D KoontzReported controller | Neither history importedView source coverage → |
| Pat O'Hara Sand And Gravel PitPark, WYMSHA 4801074 | Construction Sand and GravelSurface | AbandonedStatus date: 02/28/1984 | Pat O'Hara CompanyReported operatorJesse M TaggartReported controller | Neither history importedView source coverage → |