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The killing of bacteria could also occur with higher silver concentrations: silver is a known bacteria killer.

Replying to my own post. Since the bacteria produce leaching liquids, high concentration ores could be put in the bottom of the pile, and after some of the metal has been leached out, be moved to the top of a follow-up pile. Low value ore on the top, higher underneath.

In situ leaching is low cost, but can pollute water if handled poorly.

Heap leaching can avoid this, but you pay for the leaching chemicals and mining work.

Bioheapleaching keeps cost down by "hiring" bacteria for to produce leaching chemicals in the pile. There is still the mining cost.
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