Retrieving "Tank Leaching" from the archives

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1. Cyanidation

   Linked via "tank leaching"

   Heap Leaching
   Heap leaching is preferred for very low-grade ores where the capital expenditure for tank leaching is prohibitive. Ore is stacked onto impermeable pads, and the cyanide solution is slowly sprayed over the heap. As the solution percolates downward through the stacked material, metal dissolution occurs. Due to the long residence times (ofte…