Gilman Minerals, Colorado Mines Geology Museum Digital ...
Oct 14, 2018· Mining at the Eagle Mine and its precursors began in the 1880s, initially for gold and silver but was predominately zinc during later stages of its operation. The mine closed in 1984 and became an Environmental Protection Agency (EPA) Superfund site. The CSM Geology Museum is home to collections of specimens from Gilman''s Eagle Mine deposits.