| YoungGarfield, COMSHA 0503360 | Construction Sand and GravelSurface | AbandonedStatus date: 11/12/1980 | Colorado Department Of HighwaysReported operatorState Of ColoradoReported controller | Neither history importedView source coverage → |
| Youngfield Pit And PlantJefferson, COMSHA 0501001 | Construction Sand and GravelSurface | AbandonedStatus date: 09/22/1978 | Mobile Premix Sand & Gravel CompanyReported operatorM P M IncReported controller | Neither history importedView source coverage → |
| Young Ranch ResourceGilpin, CONear Central CityMSHA 0505165 | Construction Sand and GravelSurface | AbandonedStatus date: 02/23/2026 | Young Ranch Resource, LLCReported operatorRobert Young JrReported controller | Production / employmentSafety recordsView source coverage → |
| Yukon MillSan Juan, COMSHA 0502142 | Gold OreFacility | AbandonedStatus date: 02/07/1983 | Arrigo Milling & MiningReported operatorArrigo Milling & MiningReported controller | Neither history importedView source coverage → |
| Yust Ranch Gravel PitGrand, CONear KremmlingMSHA 0504530 | Construction Sand and GravelSurface | AbandonedStatus date: 07/29/2008 | Tri-River IncReported operatorJerry CarpenterReported controller | Production / employmentSafety recordsView source coverage → |
| Zamboanga MineSan Miguel, COMSHA 0503871 | Gold OreUnderground | AbandonedStatus date: 04/25/1985 | Zamboanga MiningReported operatorZamboanga MiningReported controller | Neither history importedView source coverage → |
| Zapata CrushingAlamosa, COMSHA 0503710 | Construction Sand and GravelSurface | AbandonedStatus date: 03/07/1983 | Southway Const Co Inc & Asphalt Gravel Prod IncReported operatorEstate of Henry T. Southway Jr.Reported controller | Neither history importedView source coverage → |
| Zigan Sand And Gravel Pit 2Adams, COMSHA 0503553 | Construction Sand and GravelSurface | AbandonedStatus date: 02/07/1995 | Zigan Sand & Gravel IncReported operatorZigan TedReported controller | Neither history importedView source coverage → |
| Zinghein QuarryFremont, COMSHA 0500863 | Crushed, Broken Stone NECSurface | AbandonedStatus date: 07/26/1979 | Texas Creek Native Stone IncReported operatorTexas Creek Native Stone IncReported controller | Neither history importedView source coverage → |
| Zweck PitBoulder, COMSHA 0504375 | Construction Sand and GravelSurface | AbandonedStatus date: 09/25/1991 | C & M Sand & GravelReported operatorDavid B NystromReported controller | Neither history importedView source coverage → |