Leading mining historian Kerby Jackson introduces us to a classic mining publication on Colorado Mining. First published in 1911, it has been unavailable since those days and sheds important light on the mines and mineral deposits of the Breckenridge Mining District in Summit County, Colorado. Included are geologic details on dozens of mines in this important mining Colorado region. 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.