I can't get steel beam from large junkyard, because I can't upgrade medium junkyard without steel beam ))) And there is not steel beam in medium junkyard
How can I upgrade my mine to dark mine ? Dark Mine -> Steel Beam ->Steam Hammer -> Steam Machine -> Thermocouple -> Thermocouple Wire -> Constantan Wire -> Constantan Ingot -> Nickel Ingot -> Pentlandite -> DARK MINE!!!