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Process Introduction:
The gold heap leaching process is often used to concentrate gold deposits with small ore bodies or low grades, or both, which cannot be developed and utilized by conventional methods. The main process is to crush low-grade gold ore to a certain particle size (or granulate), stock on a leak-proof bottom pad made of asphalt or plastic and other materials, use low-concentration cyanide, alkaline solution, non-toxic solvent and other solutions to spray the mine pile to dissolve the gold, and the gold-containing solution is percolated from the mine pile, and then the gold is recovered by activated carbon adsorption and other methods.
Run-of-mine gold ore is transported to the crushing plant. Jaw crushers, cone crushers and vibrating screens may be used to reduce the ore to a suitable size.
When the ore contains a significant amount of fine material, agglomeration may be required before stacking.
The prepared ore is stacked on an engineered heap leach pad.
Once the heap has been constructed, the leaching solution is distributed across the surface through an irrigation system.
For many gold heap-leach operations, Carbon-in-Column (CIC) is used to recover dissolved gold from the solution.
Smelting produces gold doré, which can subsequently be sent for further refining depending on the required final purity.
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