Processing gold involves several stages, from ore extraction to the final refined product. The equipment used depends on the scale of operation (artisanal, small-scale, or industrial) and the type of deposit (alluvial/placer or hard rock). Below is a breakdown of key processing equipment for gold:
1. Crushing and Grinding Equipment
Used to break down ore into smaller particles for further processing.
– Jaw Crusher: Primary crushing of hard rock ore.
– Cone Crusher/Gyratory Crusher: Secondary crushing.
– Ball Mill/Rod Mill: Grinds crushed ore into fine powder for leaching.
– Hammer Mill: Used in small-scale operations.
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2. Gravity Separation Equipment
Ideal for free-milling gold or alluvial deposits where gold is liberated.
– Centrifugal Concentrator (e.g., Knelson, Falcon): Recovers fine gold particles using centrifugal force.
– Shaking Table (Wilfley Table): Separates gold from lighter gangue material.
– Slulce Boxes & Gold Pans: Traditional tools for placer mining.
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g Separator: Used in both alluvial and hard rock processing.
3. Flotation Equipment
For sulfide ores where gold is locked in minerals like pyrite or arsenopyrite.
– Flotation Cells (Mechanical/Column): Uses chemicals to separate gold-bearing minerals from waste rock.
4. Leaching & Adsorption Equipment
For extracting gold from finely ground ore using cyanide or alternative lixiviants.
– CIL/CIP Tanks (Carbon-in-Leach/Carbon-in-Pulp): Gold dissolves in cyanide solution and adsorbs onto activated carbon.
– Heap Leach Pads: Low-cost method for low-grade ores; uses sprinklers to apply leaching solution over stacked ore.
5. Smelting & Refining Equipment
To purify gold into high-purity bars or dore metal.
– Induction Furnace/Muffle Furnace: Melts gold concentrates with fluxes to remove impurities.
– Electrolytic Refining Cell (Miller Process/Wohlwill Process): Produces 99.99% pure gold bars.
6. Mercury-Based Processing (Not Recommended)
Still used in some artisanal mining but hazardous:
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