Importance

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Abstract

The present invention is directed to heap leach processes for leaching metal values from ore. The heap is constructed with a plurality of cellular heaps formed by loading ore onto an impermeable pad having a raised berm network thereon to separate the pad surface into a plurality of reservoirs. Leach solution percolating through the ore is collected in the respective reservoirs. Additional cellular heaps may be subsequently built overlying the original cellular heaps with an impermeable barrier being placed between stacked cellular heaps to prevent overleaching of underlying cellular heaps. The effluent leach solution from the overlying cellular heap is routed to the underlying reservoir from where it is withdrawn. Use of berms on the surface of the individual cellular heaps permits pooling of leach solution thereon for enhanced leaching. An earthen dam around the heap eliminates ore sides to the heap and insulates the heap during cold weather. Leach solution is recirculated through the various cellular heaps and a countercurrent-type leach cycle results in the continuous production of extremely concentrated solution to the recovery facility and results in uniform leaching of the ore. A pad is provided with an underlying compartmentalized monitor system which permits containment of solutions leaking through the pad, and which allows for identification of the location of the leak so that the leaking portion of the pad may be sealed off or repaired.

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First Claim