There's a huge difference between providing a stable source of iron from a mine, and dumping on the market, all at once, what would take ten years to mine. If

There's a huge difference between providing a stable source of iron from a mine, and dumping on the market, all at once, what would take ten years to mine. If you were certain you'd get it back to earth, you could offset this effect by slowly selling futures contracts. But if you then fail to bring back the iron you'd just cause he opposite problem: a sudden increase in scarcity (when you default on your futures contracts), rather than a sudden increase in abundance. I believe the solution is to partner with an insurance company, but I'm not sure anyone is large enough to cover the amounts we're talking about here. The amount you could bring back safely would probably mostly be limited by the insurance premium you can afford to pay.