Dredging operations (118)

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Mine name Dredging operations
State Colorado
County Summit
Mineral Gold
Author Ransome, F.L.
View down the Swan showing dredging operations. Valley of the Swan in the distance.   Breckenridge District. Summit County, Colorado.  1909. Published in Plate 33-A in U.S. Geological Survey Professional paper 75, 1911.
Caption View down the Swan showing dredging operations. Valley of the Swan in the distance. Breckenridge District. Summit County, Colorado. 1909. Published in Plate 33-A in U.S. Geological Survey Professional paper 75, 1911.