Placer Gold Mining Process

The principle of placer/alluvial gold recovery process is to maximize the recovery rate of gold and the associated heavy minerals from gangues firstly, and then separate gold from the associated heavy minerals by joint mining solutions such as gravity separation, flotation, amalgamation, magnetic separation and electrostatic separation.

• Ore washing operation is an important process before the placer gold separating operation. Its main purpose is to separate the gravel, sand and granular soil, and wash the fine mud adhering to the gravel and the gold ore mixed in it.
• Screening operation main purpose is to screen the placer gold ore after washing, and to screen out large pieces of gravel without gold, so as to improve the gold recovery efficiency.
• Gravity separation process is due to the large specific gravity and coarse particle size of placer gold, which is generally 0.074~2mm, and the second reason is that the gravity separation process is economical and simple.
• Concentrate operation, gravity separation process, magnetic separation process, flotation process, electric separation process or combined process can be used to separate gold and various heavy minerals from each other, so as to further improve the grade of gold.

Since gold is in a free state in placer gold, and the specific gravity difference between gold and sand is very obvious, the placer/alluvial gold gravity separation method is ideal for extracting gold from placer ore. The task of our placer gold processing production line is to separate gold from a large amount of mixed gravel to ensure a higher metal recovery rate and better economic benefits.

Placer Gold Mining Plant

This setup is a 150tph complete alluvial gold processing plant, the raw material is 0-150mm alluvial gold ore with much clay, the gold nugget size is around 0-10mm, and it with some magnetic ores.

• Vibrating feeder with gap 100mm grizzly bar
• Trommel scrubber
• Drum magnetic separator
• Centrifugal concentrator
• Shaking table
• Gold sluice box
• Belt conveyor
• Gold melting furnace

1. The truck unloads the ore into the hopper, and the stone enters the vibrating feeder from the lower part of the hopper; the +100mm scrap will be separated by the vibrating feeder grizzly bar and transferred by a conveyor to a stockpile.
2. The vibrating feeder feeds the -100mm ores evenly to the trommel scrubber to wash. They are connected by a trough.
3. The trommel scrubber is equipped with 2 layer screens, the mesh is 2mm &10mm. 0-2mm material will flow to drum magnetic separator to remove the magnetic ores first after washing, and then stored in one pool. The 2-10mm material will flow to a sluice box, so the 2-10mm gold nuggets can be caught by the sluice box. And +10 materials will be sent to a stockpile
4. The material 0-2mm slurry in the pool will be pumped by a slurry pump to a concentrator. The gold concentrate of the centrifugal concentrator will flow to one shaking table to further concentrate. And the tails of the concentrator will flow to a sluice box to concentrate.
5. All gold concentrates can be melted in a furnace to get gold nuggets.

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