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Currently, suction dredge mining is banned in California until 2016.
Our next set of dives will tell us more, and we'll have a suction dredge."
An airlift is a type of small suction dredge.
Soon suction dredges were put into use and the mining spread along the lower Peace River.
Small suction dredges are much more efficient at extracting smaller gold than the old bucket line.
It is sometimes called a suction dredge.
So we raced to the dock, lifted a suction dredge onto the boat and hightailed it back to our buoy.
Another option is suction dredges, which vacuum up sand and silt and filter it.
The move follows reports that a new mechanised suction dredge is breaking up river banks, blocking rivers and killing fish.
A suction dredge can be:
Gold pans and shovels are commonly allowed, but sluice boxes and suction dredges may be prohibited in some areas.
It is commercially fished in Ireland, Britain and France by suction dredge and hand raking.
Gold fever usually begins on vacations, and minor successes with a spoon and a pan can lead to purchases like a small suction dredge, which costs $800.
A suction dredge consists of a sluice box supported by pontoons, attached to a suction hose which is controlled by a miner working beneath the water.
Removing half the sediment - the rest is too expensive to remove - would take 12 years with a suction dredge and other heavy equipment and run the risk of loosening contaminated sediments.
Mechanical excavators, airlifts and suction dredges were used in the process of locating the wreck, but as soon as it began to be uncovered in earnest, more delicate techniques were employed.
Suction dredges are to remove at least 32,000 cubic yards of solids from the streambed, under a consent order negotiated in February between the Jurgielewicz Duck Farm in Moriches and the State Department of Environmental Conservation.
Because capital works usually involve hard material or high-volume works, the work is usually done using a cutter suction dredge or large trailing suction hopper dredge; but for rock works, drilling and blasting along with mechanical excavation may be used.
