2019-12-062022-02-032019-12-062022-02-03https://hdl.handle.net/11124/173641Donor: Colorado Mining Association.Treasury Tunnel site and buildings showing mountains in the background.Caption reads: "Treasury Tunnel."10 x 8 inchesblack-and-white photographsCopyright retained by Colorado Mining Association.Underground mining -- ColoradoLead mines and mining -- Colorado -- Ouray CountySilver mines and mining -- Colorado -- Ouray CountyMine buildings -- Colorado -- Ouray CountyStillImage