| Alma Queen MinePark, COMSHA 0504086 | Gold OreUnderground | AbandonedStatus date: 03/24/1986 | Alma Queen MineReported operatorZvonkovich Joseph & Michael TrouskolReported controller | Neither history importedView source coverage → |
| Alma Resources IncorporatedPark, COMSHA 0504427 | Gold OreSurface | AbandonedStatus date: 10/01/1992 | Alma Resourcers IncReported operatorOpfer Harvey EReported controller | Neither history importedView source coverage → |
| Alpha Cosair (Cowboy Johnson)Mineral, COMSHA 0503307 | Silver OreUnderground | AbandonedStatus date: 09/24/1986 | Minerals Engineering CompanyReported operatorFoust TonyReported controller | Neither history importedView source coverage → |
| ALPINE CEMENT & GRAVEL LLCMesa, CONear MolinaMSHA 0504732 | Construction Sand and GravelSurface | AbandonedStatus date: 01/23/2003 | ALPINE CEMENT & GRAVEL LLCReported operatorKenneth StrongReported controller | Safety recordsView source coverage → |
| ALPINE PITSummit, CONear BreckenridgeMSHA 0503051 | Construction Sand and GravelSurface | AbandonedStatus date: 10/01/2015 | Alpine Rock CompanyReported operatorJeffrey W Keller; John M KellerReported controller | Production / employmentSafety recordsView source coverage → |
| ALPS JUNCTION QUARRYLake, CONear LeadvilleMSHA 0504563 | Crushed, Broken Stone NECSurface | AbandonedStatus date: 10/23/2018 | Leadville Research & Development CorpReported operatorShane L CooperReported controller | Production / employmentSafety recordsView source coverage → |
| Alta ProjectSan Miguel, COMSHA 0504409 | Gold OreSurface | AbandonedStatus date: 05/26/1992 | Socorro Mining IncReported operatorSwartout Andrew TReported controller | Neither history importedView source coverage → |
| Alumet Pilot PlantJefferson, COMSHA 0502839 | Misc. Nonmetallic Mnls. NECFacility | AbandonedStatus date: 02/09/1979 | Alumet CompanyReported operatorAlumet CompanyReported controller | Neither history importedView source coverage → |
| Amarillo MinePark, COMSHA 0503739 | Gold OreSurface | AbandonedStatus date: 12/10/1984 | Amarillo Mining IncReported operatorBox Boyce MReported controller | Neither history importedView source coverage → |
| AMERICAN LODE MINE INC.Park, COMSHA 0503694 | Gold OreUnderground | AbandonedStatus date: 11/18/1996 | American Lode Mine IncReported operatorFlynn Bill & Ronnie PhillipsReported controller | Neither history importedView source coverage → |
| American MillPark, COMSHA 0502254 | Gold OreFacility | AbandonedStatus date: 07/03/1984 | Alma American Milling CorpReported operatorCoors William KReported controller | Neither history importedView source coverage → |
| AMES PORTABLE UNIT # 4Adams, CONear AdamsMSHA 0504561 | Construction Sand and GravelSurface | AbandonedStatus date: 11/04/2002 | Ames Construction IncReported operatorRaymond AmesReported controller | Production / employmentSafety recordsView source coverage → |
| Am Gilsonite Loading & Bagging PltMoffat, COMSHA 0502842 | GilsoniteFacility | AbandonedStatus date: 03/12/1979 | American Gilsonite CompanyReported operatorR E NelsonReported controller | Neither history importedView source coverage → |
| AmickRio Blanco, COMSHA 0503183 | Construction Sand and GravelSurface | AbandonedStatus date: 02/14/1980 | Bailey Construction CompanyReported operatorBailey Arlie FReported controller | Neither history importedView source coverage → |
| AmityLake, COMSHA 0503863 | Silver OreUnderground | AbandonedStatus date: 07/03/1985 | Windsor Resources (Us) LtdReported operatorWindsor Resources IncReported controller | Neither history importedView source coverage → |
| A & M MineDouglas, COMSHA 0503626 | Construction Sand and GravelSurface | AbandonedStatus date: 07/05/1985 | Castle Rock AggregatesReported operatorShelton Stanley EReported controller | Neither history importedView source coverage → |
| A & M Rock Quarry & PlantDouglas, COMSHA 0503124 | PumiceSurface | AbandonedStatus date: 07/26/1979 | Herren & Strong IncReported operatorHerren & Strong IncReported controller | Neither history importedView source coverage → |
| Anchor Tresner Coal UnitMesa, CONear FruitaMSHA 0503170 | Coal (Bituminous)Underground | Abandoned and SealedStatus date: 10/01/1981 | Coal Fuels CorpReported operatorHoyl Alfred GReported controller | Neither history importedView source coverage → |
| Andrews Pit #2Kit Carson, COMSHA 0504122 | Construction Sand and GravelSurface | AbandonedStatus date: 06/01/1987 | Andrews Sand & GravelReported operatorOrtis AndrewsReported controller | Neither history importedView source coverage → |
| Anglo Saxon #2San Juan, COMSHA 0503091 | Silver OreUnderground | AbandonedStatus date: 06/08/1982 | Pandora Mining CompanyReported operatorLoper Ray & Mary SullivanReported controller | Neither history importedView source coverage → |
| Animas AggregatesLa Plata, COMSHA 0502708 | Construction Sand and GravelSurface | AbandonedStatus date: 02/28/1986 | Animas Aggregates IncReported operatorRichard TibbitsReported controller | Neither history importedView source coverage → |
| Animas Aggregate Supply, LLCSan Juan, CONear SilvertonMSHA 0505137 | Construction Sand and GravelSurface | AbandonedStatus date: 02/10/2022 | Animas Aggregate Supply, LLCReported operatorAnthony Casternovia; Randy HanfordReported controller | Safety recordsView source coverage → |
| Animas PitMontezuma, COMSHA 0502396 | Construction Sand and GravelSurface | AbandonedStatus date: 06/29/1981 | Nielsons IncReported operatorNielsons Holding CompanyReported controller | Neither history importedView source coverage → |
| Anna MayMontrose, COMSHA 0503053 | Uranium-Vanadium OreUnderground | AbandonedStatus date: 10/14/1981 | Nuvemco LLCReported operatorEMSU LLCReported controller | Neither history importedView source coverage → |
| Ann Lc-Sr-161San Miguel, COMSHA 0502980 | Uranium OreUnderground | AbandonedStatus date: 05/04/1978 | St Jude Mining CompanyReported operatorHaldane RichardReported controller | Neither history importedView source coverage → |
| Ansley / 9 PitPark, CONear FairplayMSHA 0504600 | Construction Sand and GravelSurface | AbandonedStatus date: 11/01/2022 | Heartland Aggregate MiningReported operatorMexted Enterprises Inc; RGV LLC; Heartland Environmental Services LLCReported controller | Production / employmentSafety recordsView source coverage → |
| ANTERO GRAVEL PITHuerfano, CONear LascarMSHA 0505079 | Construction Sand and GravelSurface | AbandonedStatus date: 11/06/2023 | KW SCHRAMEK LANDSCAPE MATERIALSReported operatorKevin Wayne SchramekReported controller | Production / employmentSafety recordsView source coverage → |
| Antonito PlantConejos, CONear AntonitoMSHA 0501883 | PerliteSurface | AbandonedStatus date: 11/24/2009 | Harborlite CorporationReported operatorImerys S AReported controller | Production / employmentSafety recordsView source coverage → |
| Anvil Points MineRio Blanco, COMSHA 0502500 | Oil ShaleUnderground | AbandonedStatus date: 09/28/1984 | U S Department Of EnergyReported operatorUnited States GovernmentReported controller | Neither history importedView source coverage → |
| Aorta TunnelClear Creek, COMSHA 0503763 | Gold OreUnderground | AbandonedStatus date: 06/23/1982 | Marquette Minerals IncReported operatorHeon Raymond PReported controller | Neither history importedView source coverage → |