The only minerals of any importance which are found in alluvial deposits are gold and other precious metals, tinstone, and those gems which by reason
The grab, or “ clamshell ” type of dredge, consists of a self-filling and discharging scoop or bucket, with the necessary engine power for working
In calculating the horse-power consumed by suction and by bucket dredges, figures have been taken from the various official reports on the mining industry in
These machines consist essentially of a floating structure, supplied with a powerful pump of centrifugal type, raising sand and water through a suction pipe. Characteristic
The bucket dredge may be described as a continuous dipper dredge, the material being raised by a revolving chain of dippers or buckets, which scoop
Table of ContentsAccording to the Motive PowerTypes of DredgeDREDGE TYPES The type of a Dredge is defined according to the Nature of the Work they do. Under
Small electric dredges are great where water power is available within reasonable distance, electricity may be generated and transmitted by cable to the dredge, proving
The first steam dredge of the bucket type was launched on the Clutha in 1881. Such dredges differ from current-wheelers only in being provided with
In the Current-wheel Dredge, the mechanism on these dredges is driven by an under-shot water-wheel, placed at one or at both sides of the scow
Table of ContentsDredge HullDredge EngineDredge PumpsBucket LaddersThe BucketsDredge Grab Hooks Dredge Hull Among dredging hands, the “ hull ”—namely, “ port ” and “ starboard