Having read this "guide" I can not imaging that block cave mining is really an option. Maybe in theory but from a practical point of view (financing) very difficult to realize. Happy to be convinced of the opposit....
http://resourceinvestingnews.com/53638-underground-block-caving-guide-investors-open-pit-mining-rio-tinto-codelco-freeport-grasberg-chuquicamata.html
Having read this "guide" I can not imaging that block cave...
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