What used to be mined here?

gold
diamonds
petroleum
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The picture shows the Big Hole, an open-pit and underground diamond mine in Kimberley, South Africa. It is about 215 metres deep with a surface area of 17 hectares and it's claimed to be the largest hole excavated by hand, although this claim is disputed.
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Very interesting!
reach: rather globalAfricageographyindustryminerals

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