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to leach
Er zijn brandplekken van zuur of loog.
There are caustic burns from acid or a leaching agent.
Geen sporen van loog.
No traces of the leaching agents you were asking about.
Ze bewaarde het goud in die grote stapels loog... en gooide er toen cyanide oplossing overheen.
They were concentrating the gold in these huge leach piles... and then dumping cyanide solution on them.