2019-12-092022-02-032019-12-092022-02-03https://hdl.handle.net/11124/173723Donor: Colorado Mining Association.A materials tramway viewed from unknown mine buildings, stretching across the forested valley, with mountains in the background.Caption reads: "San Juan."10 x 8 inchesblack-and-white photographsCopyright retained by Colorado Mining Association.Underground mining -- ColoradoMaterials ropeways -- ColoradoAerial tramways -- Colorado -- San Juan CountyMine buildings -- Colorado -- San Juan CountyStillImage