During the formation of Earth, molten iron sank to its center to make the core. This took with it the vast majority of the planet's precious metals such as gold and platinum to the center of the earth. However, precious metals remain abundant in Earth's silicate mantle. This abundance results from cataclysmic meteorite showers that hit the Earth after the core formed. Meteorite gold was thus added to the mantle alone and not lost to the deep interior. All the available Earth's gold came from the cosmos.