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What used to be mined here?

gold

diamonds

petroleum

coal

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.

Ninjai

1

Bjørn Christian Tørrissen wikipedia → Big Hole

Africageographyindustryminerals

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Which of this mineral is the best diamond alternative?

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