unless we find a way to drastically reduce the amont of material we need to send outside earth orbit you can.forget wathever mining operation in space, it's far cheaper to mine on earth

that mean produce everything we need outside earth, which is probably impossible this century

or drastically reduce the cost of sending something outside earth orbit, a space elevator? a giant space cannon? (would need something big enough to cover the entire european union from east to west) this also seem impossible this century