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François Durand
Pág. 9 bladsye
The Witwatersrand Supergroup is the world?s richest goldbearing geological deposit. This approximately 2.8 milliard years old unit is overlain by the 2.71?2.67 milliard years Ventersdorp Supergroup which is in turn overlain by the 2.67?2.46 milliard...
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