$20 Trillion in industrial and precious metals including Gold, Platinum, Iron, Nickel, Manganese, Palladium, Cobalt, Molybdenum, Osmium, Rhenium, Rhodium, and Ruthenium.  Last year the Japanese  Hayabusa Asteroid probe returned samples that confirmed mineral presence of Magnesium, Iron, Silicon, Calcium, Nickel, Sodium, Aluminum, Titanium, Vanadium, Manganese, Chromium and Oxygen in the form