THE DEROCKER

THE DEROCKER washes the gravel and removes the coarse rocks and boulders while retaining the gold:
  • Automatic spring-loaded feeder
  • Self cleaning Grizzly Bars
  • All rocks washed thoroughly
The DEROCKER was developed in Canada's historic Yukon Territory by a professional Placer Miner to overcome the problems of plugged grizzlies and 'effectively' washing coarse rocks, boulders and gravel to liberate and retain the particles of gold.

The DEROCKER easily handles angular or slab-shaped materials or boulders up to four feet in diameter. Unlike other systems, the greater the percentage of large rocks and boulders, the greater yardage the DEROCKER will process.

  • As the subframe moves back and forth (yellow arrows), the deck (s) undulates, causing the material (1) to move down the deck with 2" minus dropping through the grizzly bars (purple arrows) and out the bottom to the gold recovery system, leaving the washed, coarser material (2) on the top of the deck to be discharged.

There are a variety of dump box options available for the DEROCKER depending upon the type and size of dozer, loader or excavator used.

With the DEROCKER set on an eleven degree slope, the material to be processed is loaded into a surge pile in the upper end of the machine where a built-in Spring Loaded Feeder evens the material flow across the deck while the loader cycles to the pit for more material.

The gold bearing boulders and gravels are moved across the self-cleaning grizzly bars in a wave action while being washed by high pressure water from the water manifold. The coarse, rocky material is discarded from the lower end of the DEROCKER where it can be easily removed. The 2" minus fines wash through the slots between the grizzly bars and are carried out the bottom to suitable gold recovery equipment (Centrifuges, Circular Jigs and Sluices, available from RMS) by the process water. The total water requirement of the system is relatively low as the sluice uses the same water that is used to wash the boulders.

SPECIFICATIONS

  MODEL 10x20 MODEL 14x20
CAPACITY:
Fine Material
Average Gravel
Coarse, Rocky Material
100
150-200
250
150
200-300
250-400
OPERATING DIMENSIONS: 10'5" X 21'+ 14'5" X 21'
SHIPPING DIMENSIONS 10'5" X 21'+ 1 piece 8' x 21' +
2 pieces 3' x 21' +
WEIGHT: 28,500 pounds 37,000
ENGINE/MOTOR: 28 Hp air cooled engine
30 Hp electric motor		 50 Hp electric motor
GRIZZLY/SCREENING PLATES: 400 brinell plates spaced 2" apart, joined by wear-resistant pins and bushings/or optional sealed Caterpillar pins and bushings
HYDRAULICS: Adjustable flow piston pumps for speed control, and automatic shifting
OPTIONS: Dump box suitable for loader or dozer
Recovery Units:
  • Sluice Box
  • Centrifugal concentrators for fine gold recovery
  • Jigs

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