Sorry. I ran into it by chance by flipping channels one night.
In a nutshell, it is believed that wherever an asteroid strikes the planet gold is constructed in that area...... along with irridium and other metals. It is also believed that the largest asteroid ever to strike Earth was in South Africa - no visible crater, but an indentation reaching dozens of miles in diameter.
I flew over the crater in Arizona on the way to Vegas a couple years ago and again last night. Pretty wicked destruction.
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