Did you mean to say the asteroid has more unmined gold in it than all the mined and refined gold on Earth? Because the core of the Earth likely has more mass o

Did you mean to say the asteroid has more unmined gold in it than all the mined and refined gold on Earth? Because the core of the Earth likely has more mass of gold in it than all the asteroids, moons, and dwarf planets in the solar system put together. We just find that particular gold more difficult to bring to market than gold found outside our gravity well. To extra-terrestrial aliens, strip-mining would be grabbing all the loose asteroids and comets first, at the "surface", before venturing down into the deeper holes represented by the gravity wells. Stripping larger planets is metaphorically deep-shaft mining, from a space perspective.