If you're using carbon steel (not stainless), they will turn back into dirt within a couple years/decades of weathering (aka turning into a heap of rust). If f

If you're using carbon steel (not stainless), they will turn back into dirt within a couple years/decades of weathering (aka turning into a heap of rust). If feasible, re-smelting them would be superior, as it'd skip the ore-to-iron high temperature chemistry process.