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Recapitulation of operations : Specie Payment mine
Contributor:Welles, A. M.
Report on Idaho Tunnel in Clear Creek County, Colorado
Contributor:Joyce, John T.
Extended report on the Mattie Consolidated Mines : formerly Little Mattie Mines
Contributor:Knight, D. A.; Joyce, J. T.
Extracts from prospectus filed by Humboldt Mining Co., Nov. 23rd, 1935 : properties in Clear Creek County
Contributor:Humboldt Consolidated Mining Company; United States. Bureau of Mines
Report on the Seaton-Hayden Mines Group, Clear Creek County, Colo.
Contributor:Marchington, Clarence; Hayden, W. F.
Geologic report on G. W. T. Mine : Clear Creek Co., Colo.
Contributor:Fooks, Rupert J.; Trader, George W.; Bauer, Ernest
Reconnaissance investigation of the Highland and adjoining mining claims, Idaho Springs District, Clear Creek County, Colorado
Contributor:Prommel, H. W. C. (Harold W. C.)