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All the gold in the world

07.12.2006

Australian geologist Bernard Wood of Macquarie University believes that more than 99% of all gold on Earth billions of years ago, due to its gravity, sank into the center of the planet and became part of the Earth's core. In his opinion, there is enough gold in the core to cover the entire area of our planet with a layer of precious metal about half a meter thick.

It is now believed that the Earth arose from many small asteroid-like bodies, the so-called planetesimals. They bumped into each other and stuck together. In their composition, planetesimals were similar to modern meteorites. Based on the composition of meteorites and comparing it with the composition of the earth's crust, Wood noticed that there was too little gold, platinum and nickel in the earth's crust. He suggested that these metals, due to their high density and affinity for iron, sank to the center of the Earth and became part of its iron core. The earth then was a solid ball of molten magma.

If meteorites had not continued to bring gold to the Earth even after its crust had hardened, there would be almost no gold on the surface, and it would be an even rarer and more expensive metal than it is now.

According to Wood's calculations, there should be 1 quadrillion tons of gold in the Earth's core. This is only a small fraction of the total mass of the nucleus, about one millionth. There is six times more platinum in the core.

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