AbstractsEarth & Environmental Science

"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 that in California, and most places, owing to the fact that the digging must be done on the original channel of the stream; the course of the stream at the time of the deposition of the gold. The present stream is at times, several hundred feel of original channel. As practiced elsewhere, the entire area is dredged. Here, away from the channel, dredging could not be conducted at a profit" – leaf [1].