HISTORICAL SITES / RESEARCH DIRECTORY
Find the public record behind a former mining site. Explore reported locations, mined materials and operating history as a starting point for acquisition, reuse or reclamation research.
History means records exist in the imported sources, including older periods. Missing history is not evidence of a clean safety record. Operator and controller names are the last relationships reported in the Mines snapshot; they are not verified current property owners.
| Mine / reported location | Material / type | Reported status | Reported relationships | Available history |
|---|---|---|---|---|
| Lyons PitFremont, CONear Texas CreekMSHA 0505155 | Sand, CommonSurface | AbandonedStatus date: 04/16/2024 | Operator not reportedReported operatorController not reportedReported controller | Neither history importedView source coverage → |
| LYONS QUARRYBoulder, CONear LyonsMSHA 0501437 | Crushed, Broken SandstoneSurface | AbandonedStatus date: 06/25/2007 | Aggregate Industries WCR IncReported operatorAmrize LtdReported controller | Production / employmentSafety recordsView source coverage → |
| Lyons RedLarimer, CONear LyonsMSHA 0500448 | Dimension SandstoneSurface | AbandonedStatus date: 08/29/2014 | Arkins Park StoneReported operatorJudy SpragueReported controller | Production / employmentSafety recordsView source coverage → |
| Mac-BobPark, COMSHA 0503111 | Silver OreSurface | AbandonedStatus date: 12/10/1984 | Robert E Snuggs-Roy Mc CuneReported operatorRobert E Snuggs-Roy Mc CuneReported controller | Neither history importedView source coverage → |
| Mackay 444Gilpin, COMSHA 0503890 | Gold OreUnderground | AbandonedStatus date: 12/09/1991 | Echo Gold CorpReported operatorTrites Albert FReported controller | Neither history importedView source coverage → |
| Mackenzie PitFremont, CONear Canon CityMSHA 0500977 | Construction Sand and GravelSurface | AbandonedStatus date: 03/20/2009 | Oldcastle SW Group, IncReported operatorCRH PLCReported controller | Production / employmentSafety recordsView source coverage → |
| Mad Jack No 1San Miguel, CONear NorwoodMSHA 0503497 | Coal (Bituminous)Underground | Abandoned and SealedStatus date: 08/05/1999 | Tri-Island Land & Cattle Company IncReported operatorPyle DenverReported controller | Neither history importedView source coverage → |
| Mahoffey PitGarfield, COMSHA 0503623 | Construction Sand and GravelSurface | AbandonedStatus date: 05/30/1985 | Corn Construction CompanyReported operatorLarry W CornReported controller | Neither history importedView source coverage → |
| Maitland #2Huerfano, COMSHA 0500261 | Coal (Bituminous)Underground | AbandonedStatus date: 12/26/1972 | Red Ash Coal CompanyReported operatorFink FrankReported controller | Neither history importedView source coverage → |
| Mamm Creek PitGarfield, CONear RifleMSHA 0504567 | Construction Sand and GravelSurface | AbandonedStatus date: 08/31/2023 | Grant Brothers Construction LLCReported operatorDaniel Grant; Douglas Grant; Richard GrantReported controller | Production / employmentSafety recordsView source coverage → |
| Mammoth Mines No 114 & 423Gilpin, COMSHA 0502774 | Silver OreUnderground | AbandonedStatus date: 10/06/1982 | Kong Mining Company IncReported operatorKong Mining Company IncReported controller | Neither history importedView source coverage → |
| Mancos Valley GravelMontezuma, COMSHA 0504236 | Construction Sand and GravelSurface | AbandonedStatus date: 07/22/1992 | Mancos Valley GravelReported operatorCarl StroheckerReported controller | Neither history importedView source coverage → |
| Mann Lake PitAdams, CONear BrightonMSHA 0503453 | Construction Sand and GravelSurface | AbandonedStatus date: 04/07/2004 | Lafarge West IncorporatedReported operatorHolcim LtdReported controller | Production / employmentSafety recordsView source coverage → |
| Marion CanyonGarfield, COMSHA 0503593 | Coal (Bituminous)Underground | AbandonedStatus date: 02/10/1981 | Mountain States Machinery & Supply IncReported operatorHarmond George MReported controller | Neither history importedView source coverage → |
| Marion MillBoulder, COMSHA 0501831 | Gold OreFacility | AbandonedStatus date: 07/09/1992 | Sweeney Mining & Milling CorpReported operatorSweeney Gordon EReported controller | Neither history importedView source coverage → |
| MarkhamWashington, COMSHA 0503384 | Construction Sand and GravelSurface | AbandonedStatus date: 08/27/1979 | Colorado Department Of HighwaysReported operatorState Of ColoradoReported controller | Neither history importedView source coverage → |
| Marlatt PitBoulder, COMSHA 0502657 | Construction Sand and GravelSurface | AbandonedStatus date: 06/24/1994 | Golden Gravel CompanyReported operatorStewart V GoldenReported controller | Neither history importedView source coverage → |
| Marr StripJackson, CONear WaldenMSHA 0502674 | Coal (Bituminous)Surface | AbandonedStatus date: 03/18/1993 | Kerr Coal CorpReported operatorEnergy Fuels Coal Resources LtdReported controller | Neither history importedView source coverage → |
| Martinez #2 UgLas Animas, COMSHA 0500272 | Coal (Bituminous)Underground | AbandonedStatus date: 10/05/1971 | Martinez Coal CompanyReported operatorMartinez Coal CompanyReported controller | Neither history importedView source coverage → |
| Martinez MineArchuleta, CONear Pagosa SpringsMSHA 0503022 | Coal (Bituminous)Surface | AbandonedStatus date: 09/15/1985 | Bechtel Operating Service CorpReported operatorBechtel Group IncReported controller | Neither history importedView source coverage → |
| Mary Mc KinneyTeller, COMSHA 0503870 | Crushed, Broken Stone NECSurface | AbandonedStatus date: 07/02/1986 | Pioneer Sand CompanyReported operatorJLL Partners IncorporatedReported controller | Neither history importedView source coverage → |
| Mary Murphy MineChaffee, COMSHA 0503711 | Gold OreUnderground | AbandonedStatus date: 06/24/1982 | American International Mining Company IncReported operatorOmni Resource Development IncReported controller | Neither history importedView source coverage → |
| Mary Nevin MineTeller, COMSHA 0502815 | Gold OreFacility | AbandonedStatus date: 09/16/1987 | Gold Ore Ltd Of Cripple CreekReported operatorWallace Joe-Val GinnReported controller | Neither history importedView source coverage → |
| MascotGilpin, COMSHA 0503767 | Silver OreUnderground | AbandonedStatus date: 01/19/1989 | Mills MinesReported operatorMills MinesReported controller | Neither history importedView source coverage → |
| Mason MineLa Plata, COMSHA 0504408 | Gold OreUnderground | AbandonedStatus date: 09/11/1989 | Colorado Mining Properties IncReported operatorThompson ArtReported controller | Neither history importedView source coverage → |
| MASON SAND PITEl Paso, CONear Colorado SpringsMSHA 0502411 | Construction Sand and GravelSurface | AbandonedStatus date: 03/09/2010 | Pioneer Sand CompanyReported operatorJLL Partners IncorporatedReported controller | Production / employmentSafety recordsView source coverage → |
| Masonville Industries IncorporatedLarimer, COMSHA 0504224 | Construction Sand and GravelSurface | AbandonedStatus date: 08/14/1992 | Masonville Industries IncReported operatorJacobson GaryReported controller | Neither history importedView source coverage → |
| Matchless MineMesa, COMSHA 0503184 | Uranium OreUnderground | AbandonedStatus date: 06/17/1982 | Zimmerman Mining CoReported operatorZimmerman Mining CoReported controller | Neither history importedView source coverage → |
| Mathias North Pit & PlantRio Grande, COMSHA 0502514 | Construction Sand and GravelSurface | AbandonedStatus date: 11/06/1978 | Mathias Concrete IncReported operatorMarshall T MathiasReported controller | Neither history importedView source coverage → |
| Mauz Mannon PitJefferson, COMSHA 0503624 | Construction Sand and GravelSurface | AbandonedStatus date: 08/01/1984 | Adolph Coors CompanyReported operatorCoors William KReported controller | Neither history importedView source coverage → |
Use the mine name and reported location to investigate county parcel and title records, mineral rights, access and planning constraints. MSHA mailing addresses are addresses of record and may not locate the mine. Confirm the parcel and current ownership separately.
EPA mine-site redevelopment primer ↗Check official reclamation inventories and state or tribal programmes for documented hazards, project status and programme criteria. A matching name or an MSHA abandoned status alone does not confirm a programme match.
OSMRE abandoned mine land programme ↗Source: MSHA public datasets. Production history checks quarterly and annual mine production/employment records. Safety history checks violations, inspections and accident reports; other source coverage is available on each mine profile.