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Dredge Design & Overview

Let us design a dredge to meet your needs!

No two mining operations are the same. Thats why Supreme Manufacturing offers custom dredge design. If you can dream it, we can build it.

A CAD Drawing of a dredge

GENERAL TYPES AND DESCRIPTIONS:

Tilting boom – Generally used in smaller operations where budget is a concern.  Less expensive, easier to ship, assemble and relocate (modular design).  Powering by generator is common with this style dredge.  Larger and twin Tilting Boom machines are in the design phase.  Sizes are typically 4/6/8 cubic yards with production 300 TPH – 500 TPH.

Gantry type – Most common worldwide.  Larger capacities and is designed for more versatility.  Larger pontoon footprint allows for increased digging well, greater stability and more room for onboard equipment.  Sizes are typically 8/10/13/16/18/20 cubic yards with production from 350 TPH and up.

Twin Gantry Type – These systems are utilized where consistent high capacities are required (1,000 to 2,500+ TPH).  Basically two dredge systems on one central floatation system.  The ultimate system.  Each bucket is controlled independently.  Buckets feed either a central hopper arrangement or can be designed with two independent dewatering systems.  Redundancy is the key in these machines.  If one bucket is “down” the dredge is still able to produce material.  Another feature is the ability to dig out a stuck bucket. Sizes are typically 13/16/18/20 cubic yards with production from 1,000 TPH and up.

Catamaran Type – Originally designed for use in clay deposits.  All of the advantages of the gantry type system, plus the ability to load barges directly.  It is more expensive than standard gantry type due to increased size/weight of superstructure and pontoons.  Other advantages include: the most stable dredge platform, wider digging area (more digging positions,) ease of bucket removal and a large bucket service position.   Sizes are typically 10/13/16/18/20 cubic yards with production from 400 TPH and up.

ADVANTAGES OF CLAMSHELL DREDGING:

  • Depth capability.  They are typically designed for 200’ feet of mining depth.  There are several machines in service today digging more than 300’.  Deeper designs are possible.
  • Increase reserves and the ability to re-open existing properties that are already permitted
  • Increase land value
  • No loss of fines
  • Able to extract large size particles
  • Reduce material handling costs
  • Eliminate diesel use when designed for all electric
  • Reduce manpower
  • Increase efficiency
  • Improve material flow
  • Ease of re-sale with high residual value of equipment

IDEAL APPLICATION:

An ideal application would be an alluvial deposit of sand and gravel found in glacial areas and river basins, typically with a deposit depth greater than 25 feet.  Another ideal location is near urban areas where deposits run deep and producer is surrounded by development.

ONBOARD PROCESSING OPTIONS:

  • Dewatering Systems – Most clamshell dredges are equipped with material dewatering systems consisting of a double/triple deck horizontal screen.  Top deck usually carries the larger gravel.  Bottom deck is the dewatering deck.  Size is dictated by customer needs and other equipment onboard (i.e. FSR, etc) moisture content should be less than 12% to conveyor system
  • Fine Sand Recovery – This is a system to capture fine material to as small as 200 mesh.  Equipment required: vertical pump, cyclone, high frequency dewatering screen, support structure and piping.
  • Sliding Grizzly – Positioned above the hopper. This option allows the operator to “rake” oversize material and clay to a barge or onboard crushing system. **This system is not compatible with deposits of flat rock.
  • Dump Grizzly – This grizzly is designed with square openings.  It is operated by hydraulic cylinders.
  • Onboard Crushing – The onboard primary crushing has become more popular.  Typically a jaw crusher is used, but some systems may utilize impact crushers.
  • Hydraulic Rock Breaker – Typically used in conjunction with an onboard crushing system.  This allows the operator to limit the size of material before sending it to the crusher and to clean the grizzly.
  • Spray Bar Systems – Used where deposits are high in fine material or clays.  These systems help wash out unwanted material.
  • Wash Down SystemsFor washing the pontoon decks and conveyor transitions.
  • Material Pumping System – If replacing a hydraulic dredging system to maximize depth in a deposit… a customer may want to retain the existing land-based plant.  The clamshell system can be designed to accommodate a material pumping system.  This requires a change to the screening process.  Rather than a dewatering screen, we utilize a simple scalping screen, which screens at approximately 4”.  All minus 4” material is sent to a sump tank and pumped to the plant using a pump and floating pipeline.