2019-12-122022-02-032019-12-122022-02-03https://hdl.handle.net/11124/173871Donor: Colorado Mining Association.Buildings and vehicles, Alexite mine site, Powderhorn.Caption reads: "Alexite mine, Powderhorn, Summit."6 x 4 inchesblack-and-white photographsCopyright retained by Colorado Mining Association.Vermiculite industry and trade -- ColoradoSurface mining -- ColoradoVermiculite mines and mining -- Colorado -- Gunnison CountyManganese mines and mining -- Colorado -- Gunnison CountyMine buildings -- Colorado -- Gunnison CountyAlexite Mine (Colo.)StillImage