Talk:Demon Altar/@comment-87.52.35.108-20111204195329/@comment-4658608-20111212133635

It cycles Cobalt, Mythril, Adamantite in that order. Each Altar you break will spawn the next ore in the cycle. Every third altar you break resets the cycle to Cobalt, and will spawn more of each ore as you continue to break more altars. Hope that helps.