Board Thread:Questions and Answers/@comment-5251698-20130308044134/@comment-121.214.117.200-20130309115819

Keep in mind that there are two different copper and tin ores, with different item IDs. I'm not sure if they both spawn naturally (I've only ever seen one kind, but there's another in the TMI item list), but you should watch out for them. Also, obsidian.