An very easy way to get metal using Argy is riding on any flyer then whistling follow to about 3 or more argys (I use tapejera as a flyer) then taking them to lava mountain . Remember to put lots of woods in argys inventory. Make an smelting place + storage at the top of the mountain put those woods in the forge . And request an anky to there then just mine all the metal with anky and put most of them to smelt and take out other in the Argy . And take them back to home. And let the other metal to smelt at your base. After a few in game days get back to that mountain with those argys and carry all the iron back to base .