| Byzantine QuarryFremont, CONear PenroseMSHA 0504845 | Crushed, Broken SandstoneSurface | AbandonedStatus date: 10/01/2010 | Larson Colorado LLCReported operatorNorbie LarsenReported controller | Production / employmentSafety recordsView source coverage → |
| CADGENE PITMontrose, COMSHA 0504544 | Construction Sand and GravelSurface | AbandonedStatus date: 06/19/2000 | Maverick Sand & GravelReported operatorT S Landfill Inc; Redvale Sand & Gravel IncReported controller | Production / employmentSafety recordsView source coverage → |
| Calder PitEl Paso, COMSHA 0503275 | Construction Sand and GravelSurface | AbandonedStatus date: 07/23/1979 | El Paso County Dept Of TransportationReported operatorEl Paso County-CoReported controller | Neither history importedView source coverage → |
| Caldwell Brothers PitOtero, COMSHA 0503554 | Construction Sand and GravelSurface | AbandonedStatus date: 09/19/1989 | Hlm Construction IncReported operatorMills Terry LReported controller | Neither history importedView source coverage → |
| CALHOUN-EATON PITEagle, COMSHA 0502140 | Construction Sand and GravelSurface | AbandonedStatus date: 10/10/2000 | B & B Excavating IncReported operatorCRH PLCReported controller | Production / employmentSafety recordsView source coverage → |
| California ShaftBoulder, COMSHA 0503830 | Gold OreUnderground | AbandonedStatus date: 07/11/1984 | Colorado Consolidated Metals CorpReported operatorPaul E DanioReported controller | Neither history importedView source coverage → |
| Calmet FacilityEl Paso, COMSHA 0503860 | Gold OreFacility | AbandonedStatus date: 10/27/1988 | London Mine VentureReported operatorCobb Resources Corp & Boulder Gold IncReported controller | Neither history importedView source coverage → |
| Calumet No 2 MineHuerfano, CONear WalsenburgMSHA 0500295 | Coal (Bituminous)Underground | Abandoned and SealedStatus date: 12/28/1983 | Delcarbon Coal CompanyReported operatorDelcarbon Coal CompanyReported controller | Neither history importedView source coverage → |
| Camp Bird MineOuray, COMSHA 0500437 | Gold OreUnderground | AbandonedStatus date: 08/01/1991 | Royal Camp Bird IncReported operatorRoyal Gold IncReported controller | Neither history importedView source coverage → |
| Camp Bird MineOuray, CONear OurayMSHA 0504947 | Gold OreUnderground | AbandonedStatus date: 08/11/2014 | Caldera Mineral Resources, LLCReported operatorThe Watley Group LLCReported controller | Production / employmentSafety recordsView source coverage → |
| Canadian StripJackson, CONear WaldenMSHA 0502661 | Coal (Bituminous)Surface | AbandonedStatus date: 07/09/1987 | Wyoming Fuel CompanyReported operatorKn Energy IncReported controller | Neither history importedView source coverage → |
| Canon Black DiamondFremont, COMSHA 0500244 | Coal (Bituminous)Underground | AbandonedStatus date: 06/12/1973 | Canon Black Diamond Coal CompanyReported operatorCanon Black Diamond Coal CompanyReported controller | Neither history importedView source coverage → |
| Canon City Concrete DivisionFremont, COMSHA 0500956 | Construction Sand and GravelSurface | AbandonedStatus date: 01/09/1991 | Valco IncReported operatorThomas E BrubakerReported controller | Neither history importedView source coverage → |
| Canon DolomiteFremont, COMSHA 0500013 | Misc. Nonmetallic Mnls. NECSurface | AbandonedStatus date: 04/08/1988 | C F & I Steel CorpReported operatorYaklich F JReported controller | Neither history importedView source coverage → |
| Canon Zenith No 2 MineFremont, COMSHA 0500251 | Coal (Bituminous)Underground | AbandonedStatus date: 08/29/1974 | Nick Moschetti Coal CompanyReported operatorMoschetti NickReported controller | Neither history importedView source coverage → |
| Can-Usa QuarriesFremont, COMSHA 0504002 | Dimension Stone NECSurface | AbandonedStatus date: 06/03/1986 | Can-Usa Construction IncReported operatorToews VernReported controller | Neither history importedView source coverage → |
| Canyon 7 MineMontrose, COMSHA 0503210 | Uranium OreUnderground | AbandonedStatus date: 03/24/1980 | Cooper MiningReported operatorCooper Paul & TimReported controller | Neither history importedView source coverage → |
| Canyon Claims #8Montrose, COMSHA 0503853 | Uranium OreUnderground | AbandonedStatus date: 10/26/1983 | Hatfield Mining IncReported operatorHatfield HerbertReported controller | Neither history importedView source coverage → |
| CANYON SAND & GRAVELArchuleta, CONear Pagosa SpringsMSHA 0504576 | Construction Sand and GravelSurface | AbandonedStatus date: 10/01/2007 | Canyon Sand & GravelReported operatorRobert ScottReported controller | Production / employmentSafety recordsView source coverage → |
| Capital PrizeClear Creek, COMSHA 0503856 | Gold OreUnderground | AbandonedStatus date: 07/03/1985 | Saturn Energy & Resources LtdReported operatorRobinson RoyReported controller | Neither history importedView source coverage → |
| Cappellucci Pit #1Las Animas, COMSHA 0503971 | Construction Sand and GravelSurface | AbandonedStatus date: 02/05/1985 | J & M Aggregates IncReported operatorJames W CReported controller | Neither history importedView source coverage → |
| Captain Jack MillBoulder, COMSHA 0500540 | Gold OreSurface | AbandonedStatus date: 09/07/1989 | Cr-Vcm Joint VentureReported operatorCitiresources Inc & Virginia Canyon Mining Co IncReported controller | Neither history importedView source coverage → |
| Carbonate HillTeller, COMSHA 0504404 | Gold OreSurface | AbandonedStatus date: 02/04/1991 | Levon Resources IncReported operatorFairchild Gold CorpReported controller | Neither history importedView source coverage → |
| Carbondale Plant-Wash PlantGarfield, CONear cARBONDALEMSHA 0504631 | Construction Sand and GravelSurface | AbandonedStatus date: 10/24/2018 | Western Slope Materials, LLCReported operatorDavid Stewart; Travis J StewartReported controller | Production / employmentSafety recordsView source coverage → |
| Carbon Junction MineLa Plata, CONear Durango, ColoradoMSHA 0503683 | Coal (Bituminous)Surface | AbandonedStatus date: 08/05/1999 | Oakridge Energy IncReported operatorPautsky NoelReported controller | Neither history importedView source coverage → |
| Carbon Mountain PitJefferson, COMSHA 0502031 | Construction Sand and GravelSurface | AbandonedStatus date: 04/01/1974 | Western Paving Construction CompanyReported operatorKoppers Company IncReported controller | Neither history importedView source coverage → |
| Carbon Valley Resource Weld, CONear FirestoneMSHA 0503707 | Construction Sand and GravelSurface | AbandonedStatus date: 09/08/2025 | L.G. Everist, Inc.Reported operatorL G Everist IncReported controller | Production / employmentSafety recordsView source coverage → |
| Caribou MineBoulder, COMSHA 0503599 | Silver OreUnderground | AbandonedStatus date: 08/12/1986 | Nederland Mines IncReported operatorHorvath George AReported controller | Neither history importedView source coverage → |
| CarlsonMorgan, COMSHA 0503380 | Construction Sand and GravelSurface | AbandonedStatus date: 08/27/1979 | Colorado Department Of HighwaysReported operatorState Of ColoradoReported controller | Neither history importedView source coverage → |
| CarlucciMesa, COMSHA 0503909 | Construction Sand and GravelSurface | AbandonedStatus date: 05/30/1985 | Corn Construction CompanyReported operatorLarry W CornReported controller | Neither history importedView source coverage → |