Leading mining historian Kerby Jackson introduces us to a classic mining publication on Colorado Mining. First published in 1921, "The Annual Report for 1920" by the Colorado Bureau of Mines has been unavailable since those days and sheds important light on the history of the famous mining area in Colorado. Featured here are insights into the mineral industry of Colorado as it existed in 1920, complete with full statistics of all known operating gold, silver, copper and other mines that operated throughout the state. Note: This edition is a perfect facsimile of the original edition and is not set in a modern typeface. As such, some type characters and images might suffer from slight imperfections or minor shadows in the page background.