The idea of a space station in or near an asteroid field is easy enough to picture, but I think alexljn5thethird is saying that you should explain the entire experience in detail. What kind of ores you might find, any mobs that might be there, if you need a tier 3 rocket, any dangers, is it just for eye candy...those kinds of things.
Asteroids have been suggested before, but if you have more details that make your idea more unique then please share.