Heap-Leach-Systems

Tenova TAKRAF has specialized in plant systems for heap leaching ore, both on-off and permanent pads.
We deliver complete systems for Heap-Leach-Operations. According to the character of the ore permanent or on-off leach pads need to be equipped with stacking and reclaiming technology. Permanent leach pads are stacked layer by layer with or without liners in between up to a fairly high final leach pad without reclaiming. Tenova TAKRAF designed the mobile equipment, which receives the small sized heap from an overland conveyor: Mobile Transfer Conveyor, Mobile Conveyor Bridges and Stackers.
In an on-off system the crushed ore (minus 20mm – minus 50 mm or coarser depending on ore type) is stacked at 7 – 10 m or higher, leached and then reclaimed. Reclaim rate of more than 11,000 tons per hour has been realized.
Leaching periods of about 60 days require stockpile volumes as large as 15 million tons.

For On-Off Leach Pads Tenova TAKRAF developed a new generation of Mobile Conveyor Bridges with reduced number of segments and crawlers, and simplified maintenance and control. An on-off leach pad consists of a Mobile Stacking Conveyor Bridge (MSCB) receiving the heap from the incoming leach pad feed conveyor via tripper car. The Stacker itself with another tripper car travels permanently on the MSCB and dumps the material onto the pad. As soon as the stacker reaches the end of the bridge the MSCB segment travels simultaneously a short distance for the next stacking slice. After a sufficient time of leaching a bucket wheel style reclaimer, connected to the Mobile Reclaiming Conveyor Bridge (MRCB) excavates the material, which will be transferred further via MRCB to the leach pad load out conveyor in the centre of the leach pad. Finally the leached material will be conveyed to a spreader on a waste dump.
Tenova TAKRAFs Heap Leach Equipment works at several locations in Chile with capacities between 5000 m³/h and 7400 m³/h.

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