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<p>Gold dredging -- Colorado<br />Gold dredging -- Colorado -- Swan River<br />Gold mines and mining</p>
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Dredging, Swan River, Colorado, Henry William Lohman
Dredging, Swan River, Colorado, Henry William Lohman
Professional Degree Theses
"Operations for the extraction of gold from the gravels of this river, were started about ten years ago, at which time it was attempted by means of hydraulic elevators, later by means of the early type dredge, Risdon design, of which three were installed, and later still, an early type Bucyrus Dredge. These all resulted in failure, some alleged to have been due to impossibility of reaching bed-rock; small yardage capacity; and fraility [sic] of design. these have been overcome in the latest type of dredge constructed by the Bucyrus Company, description of which follow later. Dredging here, differs from …