World's most: Mponeng - World deepest ( 4,1 km ) mine Mponeng Go...

World's most: Mponeng - World deepest ( 4,1 km ) mine Mponeng Go...: From  SOMP Africa 2014 SOMP - Society of Mining Professors: Mponeng - World deepest ( 4,1 km ) mine Mponeng Go... : World deepest 4,1 k...

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