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There is plenty at the centre of the earth as well:
Right now, you’re standing on a goldmine. There’s so much gold on Earth you could cover every bit of land on the planet in it to a depth of 50 centimeters (20 inches), according to one calculation. So why is gold so rare that it’s a byword for preciousness? Because almost all of it has sunk to the planet’s core, beyond the reach of even the most ambitious miner.