6 Kilometers Inside 2.5 Billion Year Old Rock
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    Three kilometers down a gold mine inside rocks aged over 2.5 billion years old.
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Gold 
is not easy to extract. 

This gold mine in Mpumalanga South Africa has it's face over 7 kms down a steep incline. The rocks through which they blast are 2.5 billion years old. The noise is intense, the conditions dangerous and the work hard.