If you had that much precious metal it wouldn’t be precious anymore.
The really juicy targets for exploitation are carbonaceous asteroids and the wet asteroid Ceres, the latter of which could be cut up into a habitat for a population larger than Earth can support. People have this obsession with technology and metals but really it is Carbon, Hydrogen, Oxygen and Nitrogen that drive civilization in terms of human bodies, cattle, fabrics, plants, food, plastics, chemicals, etc.
Colonizing Mars looks unimaginative and unambiguous in comparison.
The really juicy targets for exploitation are carbonaceous asteroids and the wet asteroid Ceres, the latter of which could be cut up into a habitat for a population larger than Earth can support. People have this obsession with technology and metals but really it is Carbon, Hydrogen, Oxygen and Nitrogen that drive civilization in terms of human bodies, cattle, fabrics, plants, food, plastics, chemicals, etc.
Colonizing Mars looks unimaginative and unambiguous in comparison.