Jamie Carr Columnist

Fans of the bustling metropolis of Johannesburg should be eternally grateful to the thumping great asteroid that ploughed into Vredefort about 2-billion years ago.

The impact was monumental, causing a crater with a diameter of 300km, and distorting the Witwatersrand basin to such an extent that it produced the outcrop in Johannesburg where gold was discovered back in 1886. This strike produced 22% of all the gold that exists today on Earth, and without the helping hand from the asteroid it would probably still be lurking deep underground.

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