Structural Geology and Mining Methods on the Gogebic Range Open-file report; contains unpublished data that has not yet been peer-reviewed. Bedrock Geology Metallic Minerals Precambrian Bedrock Rocks and Minerals Data and Resources WOFR1924-01 Structural Geology and Mining Methods on the Gogebic Range Hotchkiss, W.O.; 1924 Report: 3 p. Download Related Collections Open-File Report View Open-File Report