SHELL JET SUCTION PLACER DREDGES
Our 15” Shell dredge is the largest suction dredge in Alaska, 123 ft. in length and 25 ft. wide, setting 5 ft. above water line to deck. This dredge is capable of processing 400 cubic yards per hour and generates 500 KW to run the concentrators and electrical controls.
Increased Efficiency Will Significantly Lower Mining Costs
The jet suction placer dredge is far more efficient and economical than conventional
mining methods. Conventionally
equipped placer mines with excavators, loaders and
dozers require three, four or
morelifts of the feed material and an operator on each machine, but the jet suction dredge vacuums up feed material and delivers it into the
classifier system in one swift motion.
The feed material is then distributed over the grizzly and segregated by size, with the finer particles dropping into the concentrator classifier and eventually into the tailings.
tailings are systematically distributed on an even keel for easy
While this one step
method results in obvious reductions in time and labor costs, this
proprietary process also dramatically minimizes potential loss of values inherent in the repeated
handling of the feed materials.
A 15” jet suction dredge can cut a swath of 100ft or more, requiring a crew of three per
shift plus the dredge master, while the 12” requires only
thedredge master and a crew
of two per shift.
moreefficient than digging with rippers, the jet suction dredge is capable of stripping off bedrock layers and cleaning out cracks and crevices unreachable with conventional excavators.
The dredge’s extreme suction vacuums out hard to reach cracksand crevices and ensures
maximum gold collection with the help of water’s viscosity. The intense suction cleans out bedrock crevices without ripping it up, but some more
friable bedrock is often sucked up too. Cleaning bedrock this way is
much more efficient than using rippers in the air.
A typical rock is
37%lighter in water than
in air. The water viscosity created by the jet suction dredge system results in buoyancy that aids in lifting the rock to the surface making it easy to pick up.
These suction and venturi actions are also powerful enough to break
up the densest clays, thus
resorting to the use
of a trammel. Large
boulders areno problem as the suction can easily vacuum up the surrounding sediments.
The jet suction dredge
canalso excavate to
depths of 185ft, and adapted to even greater depths
off bedrock layers and
out cracks and
crevices unreachable by conventional excavators.
The concentrator/classifiers require clean feed water at the head.
Extended Mining Seasons
The jet suction dredge can also operate in freezing weather by insulating the pump and concentrators or sluice
andbreaking pond ice
for yawing resulting in an extended
season. One of the best features of this
dredge is there is no shut down time is required for cleanup. The cleanup equipment is on board, allowing a 24 hour work day.
These dredging systems are 100% environmentally
friendly, using no chemicals
whatsoever, and can be adapted to the marine environment off Nome or
any other location
where placer minerals
aremined in the world, resulting in reclamation and claiming that
complies with all environmental standards
The Shell jet suction dredges are custom
built in the
United States in Tacoma,
Washington. Each dredge is custom built toadapt to the property
The dredge is available with both 12” and 15” intake nozzles, with pricing starting at $3,000,000 for the
12” and $5,000,000 for the 15” FOB plant. The dredges are
shipped on five 40 feet flatbed
trucks via barge, ship or railroad. If flight is
needed for access, the components can be
designed to fit inside aHercules C 130.
Your dredge can be outfitted with standard global positioning systems and depth finders,
sonar and ground
penetrating radar, as well as an underwater television to maximize both visibility and profitability.
Shell suction jet dredges are available for purchase, lease or
joint venture, and Shell staff will be available to supervise the setup and
teach you how to operate your new dredge.
The electrical room is the nerve center and power source for operating the dredge.
Concentrator - Classifiers
The concentrator/ classifier recovery is sufficient to .006 fine. With the reduction ration to 5000 to 1 pound.
The control room, where the dredge master operates the dredge, provides a full view of the entire dredge.
The cutter-head is powered by 5000 horsepower and has the power to dig 2-3” into bedrock. The vacuum system sucks the material through the pipe and is dispersed to the grizzly. It is operated on friction and gravity with no moveable parts.