Sulfide mineral bacterial leaching
Bacterial cells oxidizing the ferrous iron back to ferric iron while using slightly different contact mechanisms with the metal.
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http://wiki.biomine.skelleftea.se/wiki/index.php/Image:Leaching_mechanisms_-_contact,_non-contact_and_cooperative_leaching.png
http://wiki.biomine.skelleftea.se/wiki/index.php/Image:Leaching_mechanisms_-_contact%252C_non-contact_and_cooperative_leaching.png
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