Best way that I found to get relic iron. PLEASE let me know how you do when using this method and if I missed any good spots to check in that area.
(Sorry for bad commentary, it is my first time and my mic is very sensitive to background noise.)
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There is a spot for spin metal on Earth where at a certain time of day for about an hour the spin metal re spawns and despawns in the same place every 30 seconds. There is probably a similar spot on each planet.