Portland Mine (110)

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Mine name Portland Mine
State Colorado
County Teller
Author Ransome, F.L.
Portland Mine 5th level.  Basalt dykes in breccia.  Cripple Creek District.  Teller County, Colorado.   October 3, 1903. Published as 16-B in U.S. Geological Survey Professional paper 54, 1906.
Caption Portland Mine 5th level. Basalt dykes in breccia. Cripple Creek District. Teller County, Colorado. October 3, 1903. Published as 16-B in U.S. Geological Survey Professional paper 54, 1906.