Factorio Forums

The AAI Rangers aggro the biters (not sure if it's just because they're active vehicles, or if they pollute, or if it's due to the built-in radar), who run into the gun line and die. The Ranger picks up the crystals the biters drop, which then gets transferred to the AAI depot. These get sent back where they're crushed into powder, liquified with steam, and then catalysed into ores, which go through the normal Krastorio ore washing process. It outputs dirty water, so you need to double up on your filters, and it uses quite a bit of power and demands additional ammo production, so it's a lot less efficient than mining, but on a Death World, it's probably more viable than fighting to secure additional resource patches.