| BEAR RIVER PitRoutt, CONear Steamboat SpringsMSHA 0502041 | Construction Sand and GravelSurface | AbandonedStatus date: 04/11/2011 | All American Resources LLCReported operatorKent CottenReported controller | Production / employmentSafety recordsView source coverage → |
| BeastonLa Plata, COMSHA 0503402 | Construction Sand and GravelSurface | AbandonedStatus date: 01/03/1980 | Colorado Department Of HighwaysReported operatorState Of ColoradoReported controller | Neither history importedView source coverage → |
| Beaver Creek RedFremont, COMSHA 0500234 | Common Clays NECSurface | AbandonedStatus date: 02/17/1993 | Summit Pressed Brick & Tile CompanyReported operatorJoseph C WelteReported controller | Neither history importedView source coverage → |
| Beech Hill Quarry 1 & 2Larimer, COMSHA 0504377 | Dimension Stone NECSurface | AbandonedStatus date: 07/17/1989 | Svilar StoneReported operatorSvilar StoneReported controller | Neither history importedView source coverage → |
| BellgardtMontrose, COMSHA 0503370 | Construction Sand and GravelSurface | AbandonedStatus date: 10/14/1980 | Colorado Department Of HighwaysReported operatorState Of ColoradoReported controller | Neither history importedView source coverage → |
| Bellvue HudsonClear Creek, COMSHA 0503547 | Silver OreUnderground | AbandonedStatus date: 06/17/1981 | Beta Silver Mining CompanyReported operatorRitter Alex FReported controller | Neither history importedView source coverage → |
| Belvedere StoneEl Paso, CONear Woodland ParkMSHA 0504808 | Construction Sand and GravelSurface | AbandonedStatus date: 08/21/2007 | Belvedere Stone LLCReported operatorBill JohannsenReported controller | Production / employmentSafety recordsView source coverage → |
| Bemrose PlacerSummit, COMSHA 0503978 | Gold OreSurface | AbandonedStatus date: 07/08/1985 | Bemrose Mining CompanyReported operatorKauffman John G JrReported controller | Neither history importedView source coverage → |
| BenderChaffee, COMSHA 0503400 | Construction Sand and GravelSurface | AbandonedStatus date: 01/03/1980 | Colorado Department Of HighwaysReported operatorState Of ColoradoReported controller | Neither history importedView source coverage → |
| Bengal Tiger MineSummit, COMSHA 0503868 | Gold OreUnderground | AbandonedStatus date: 09/10/1984 | Strategic American MetalsReported operatorStrategic American MetalsReported controller | Neither history importedView source coverage → |
| Bennett AlluvialAdams, CONear HendersonMSHA 0500929 | Construction Sand and GravelSurface | AbandonedStatus date: 09/08/2025 | Martin Marietta Materials IncReported operatorMartin Marietta Materials IncReported controller | Production / employmentSafety recordsView source coverage → |
| BENNETT GRAVELDelta, COMSHA 0504595 | Construction Sand and GravelSurface | AbandonedStatus date: 01/11/1999 | Bennett'S GravelReported operatorBennett EarlReported controller | Neither history importedView source coverage → |
| Bennett MineRoutt, CONear MilnerMSHA 0502711 | Coal (Bituminous)Surface | AbandonedStatus date: 09/03/1975 | Milner Coal CorpReported operatorFulton Caesar & Charles A DentonReported controller | Neither history importedView source coverage → |
| Benson Shale PitDelta, CONear AustinMSHA 0504485 | Common ShaleSurface | AbandonedStatus date: 10/28/2004 | Benson Brothers AggregateReported operatorEd Benson; Dwight BensonReported controller | Production / employmentSafety recordsView source coverage → |
| Bernhardt Gravel MineWeld, CONear MillikenMSHA 0504654 | Construction Sand and GravelSurface | AbandonedStatus date: 05/12/2025 | BURNCO Colorado LLCReported operatorBurnco Rock Products LtdReported controller | Production / employmentSafety recordsView source coverage → |
| Berry Pit And PlantRio Blanco, COMSHA 0502728 | Construction Sand and GravelSurface | AbandonedStatus date: 01/03/1979 | Berry Bros Ready-Mix IncReported operatorBerry Bros Ready-Mix IncReported controller | Neither history importedView source coverage → |
| Berthoud Pink Larimer, CONear BerthoudMSHA 0500005 | Dimension Stone NECSurface | AbandonedStatus date: 08/20/2014 | Arkins Park Stone CorpReported operatorJudy SpragueReported controller | Production / employmentSafety recordsView source coverage → |
| Beryl Ores MillJefferson, COMSHA 0503473 | Beryl-Beryllium OreFacility | AbandonedStatus date: 06/29/1982 | Beryl Ores CompanyReported operatorMarchulones PetronillaReported controller | Neither history importedView source coverage → |
| Betty JeanMontrose, COMSHA 0503892 | Uranium-Vanadium OreUnderground | AbandonedStatus date: 07/12/1984 | Sage & Sage MiningReported operatorSage & Sage MiningReported controller | Neither history importedView source coverage → |
| Beverly Shaft MineRio Grande, COMSHA 0503481 | Gold OreUnderground | AbandonedStatus date: 07/06/1983 | T Bowers CoReported operatorT Bowers CoReported controller | Neither history importedView source coverage → |
| Big 3 MineGarfield, COMSHA 0503648 | Coal (Bituminous)Underground | AbandonedStatus date: 01/01/1981 | Richard Klippstein & W O Pickett JrReported operatorKlippstein Richard & W O Pickett JrReported controller | Neither history importedView source coverage → |
| Big Five TunnelBoulder, COMSHA 0503829 | Gold OreUnderground | AbandonedStatus date: 07/11/1984 | Colorado Consolidated Metals CorpReported operatorPaul E DanioReported controller | Neither history importedView source coverage → |
| Big Four MineSummit, COMSHA 0502309 | Gold OreUnderground | AbandonedStatus date: 08/21/1981 | Kellogg Development CorpReported operatorKellogg Development CorpReported controller | Neither history importedView source coverage → |
| Big Four TunnelLake, COMSHA 0504230 | Gold OreUnderground | AbandonedStatus date: 09/23/1987 | Highland Consolidated Mining CorpReported operatorWilson Donald WReported controller | Neither history importedView source coverage → |
| Big R Henderson PitAdams, COMSHA 0504381 | Construction Sand and GravelSurface | AbandonedStatus date: 02/13/1995 | Big R Construction Company IncReported operatorHunt Rick LeeReported controller | Neither history importedView source coverage → |
| BimetallistOuray, COMSHA 0503893 | Silver OreUnderground | AbandonedStatus date: 12/11/1984 | Minerals IncReported operatorThomas R YoungReported controller | Neither history importedView source coverage → |
| Bixby PitLarimer, COMSHA 0504379 | Construction Sand and GravelSurface | AbandonedStatus date: 08/14/1992 | Bixby ExcavatingReported operatorNapoleon ArnoldReported controller | Neither history importedView source coverage → |
| B & J EnterprisesMesa, COMSHA 0503365 | Construction Sand and GravelSurface | AbandonedStatus date: 06/29/1979 | Colorado Department Of HighwaysReported operatorState Of ColoradoReported controller | Neither history importedView source coverage → |
| Blackburn Mine/Monogram Jo DandyMontrose, COMSHA 0501817 | Uranium OreUnderground | AbandonedStatus date: 08/07/1979 | Nuvemco LLCReported operatorEMSU LLCReported controller | Neither history importedView source coverage → |
| Black Cat PitDelta, COMSHA 0503187 | Construction Sand and GravelSurface | AbandonedStatus date: 07/08/1985 | Black Cat PavingReported operatorTriantos Frank & CraigReported controller | Neither history importedView source coverage → |