Asteroid sample return research missions, such as Hayabusa, Hayabusa2, and OSIRIS-REx illustrate the challenges of collecting ore from space using current technology. As of 2023, less than 7 grams of asteroid material has been successfully returned to Earth from space. In progress missions promise to increase this amount to approximately 60 grams (two ounces). Asteroid research missions are complex endeavors and return a tiny amount of material (less than 1 milligram Hayabusa, 100 milligrams Hayabusa2, 70 grams OSIRIS-REx) relative to the size and expense of these projects ($300 million Hayabusa, $800 million Hayabusa2, $1.16 billion OSIRIS-REx).

Link: https://en.wikipedia.org/wiki/Asteroid_mining

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