complete cyanide leaching circuit & merrill crowe plant gravity gold recovery plant zoom


complete cyanide leaching circuit & merrill crowe plant gravity gold recovery plant
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Merrill Crowe in Leaching Gold / Silver Processing

Gravity Recovery & Au/Ag Leaching – CCD Merrill Crowe Plant & Refinery: This complete hydrometallurgical process plant is for recovering precious metal from oxide or very low sulphide ore deposits containing silver and/or gold more commonly. The turnkey plant is for the recovery by cyanidation leaching from ores absent of preg-robbing carbonaceous material. The initial gravity circuit will extract any coarse, slow leaching gold and silver. The simple Merrill-Crowe technology best deals with high grade gold and/or silver deposits.

This simple metallurgical concentrator includes single stage crushing, conveying, primary grinding, spiral classification, gravity concentration, slurry pumping, cyanide leaching tanks, counter-current decantation circuit, Merrill-Crowe precipitation and refinery.

With this simple flowsheet, you will recover silver and/or gold into a bullion bar.

The gravity recovery components of this circuit can easily be removed in cases where laboratory testing has revealed there are no GRG precious metals in your ore.

Our standard packages are for process plants of:

  • 25 Tonnes/Day = 1 Tonne/Hour
  • 50 Tonnes/Day = 2 Tonne/Hour
  • 100 Tonnes/Day = 4 Tonne/Hour
  • 250 Tonnes/Day = 10 Tonne/Hour

This is a standard process plant which includes only the major components of the complete metallurgical flowsheet. A detailed engineering study is required to identify unforeseen omissions that may be required to design the optimum plant.

Additionally, we offer two separate packages for plant tailings thickening/filtration and water treatment. Contact us for details.



911MPE offers all the major components of this complete process plant designed using these key design parameters:

  • Coarse/Fine ore bin
  • Vibrating Grizzly feeder
  • Jaw crusher
  • Conveyor belts
  • Wet reagent feeder
  • Ball Mill
  • Spiral classifier
  • Slurry pump
  • Trash screens
  • Agitated Leach tanks
  • Slurry pumps
  • Thickener
  • Merrill-Crowe
  • Retort
  • Furnace
  • Centrifugal concentrator (iCON i150)
  • Shaker table (Quake 5VS3)
  • Au grade = 15 g/t
  • Ag grade = 8 g/t
  • ROM = 100 mm
  • Jaw crusher F80 = 75 mm
  • Jaw crusher P80 = 12 mm
  • Steel balls = 2.5″
  • Steel balls charge = 2 tonne
  • Ball Mill F80 = 12 mm
  • Ball Mill P80 = 50 µm
  • Spiral classifier overflow = 40%
  • Leach circuit pulp density = 40%
  • Leach Retention time = 48 hr
  • Wash water ratio = 3.5
  • Thickener underflow = 55%
  • Gold production = 336 g/day
  • Silver production = 100 g/day
  • Reagents used:
    NaOH, NaCN, Flocculant, Zinc Dust

Process development testwork and detailed engineering are essential services 911Metallurgy Corp. offers separately. The equipment package described herein does not include any permitting, infrastructure, foundation, electrical, assembly, reagents/supplies or commissioning. These are all additional paid-for services we do offer if you need them.

complete cyanide leaching circuit & merrill crowe plant with gravity gold recovery circuit

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