As others have pointed out, asteroid mining does very little to Earth. In a large scale it's only for use in space. Most rare-earth minerals are not really tha

As others have pointed out, asteroid mining does very little to Earth. In a large scale it's only for use in space. Most rare-earth minerals are not really that rare. Mining them on earth will be more cost effective. If we need larger quantities than can be found on surface deep sea mining is still more cost effective than asteroid mining.