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🔔🔔 Heap Leach Pads 📢📢

The stages for heap leaching can be described as:

1- Ground Preparation and pad construction: Here the soil on a slightly sloping ground is compacted and covered by an impermeable pad (can be made of plastic).
2- Ore stacking: Then the crushed ore is stacked in the form of big heaps. Amount of fines is decreases as low as possible to improve permeability.
3- Then the leaching agent such as cyanide or acid is sprayed over the heap.
4- As, the reagent passes through the heap; the valuable metals get dissolved in it.
5- The solution containing metal is drained from the heap and collected in a pond and the solution is sent for subsequent process for metal recovery.

Here is an illustration of the process:
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DESIGN

Conceptually there are a number of designs of heap leach pads to consider. The design will be determined by the geography, amount of space available or climate. The principal types available are:

✔️Reusable Pad
✔️Expanding Pad
✔️Valley Method

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🔔COMPONENTS OF A LEACH PAD


Pad Liner system: Liner system selection depends mostly on the type of material and the thickness of the layer.
Dirk Van Zyl described the liner for a heap leach pad system as:

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