Definition of bioleaching
: the extraction of valuable metals (such as copper and gold) from ores through the action of microorganisms (such as bacteria) Until now bioleaching, as the process is known, has been held back by the leisurely pace at which bacteria munch …— Burt Chardak, Miami Herald, 24 May 1992 Bacteria have been used to extract other metals from ore, in a process called bio-leaching.— Lynn Dicks, New Scientist, 17 Apr. 2004
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to mark by some ceremony or observation
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