I heard somewhere that if you fish alot during pre-hardmode for crates and open them in hardmode, you'll get alot of hardmode ores, so i tried this and opened 109 crates but
Terraria Xbox 1.2.4: Iron Crate Opening - HARDMODE - 99 Crates - YouTube
Biome crate percentages | Terraria Community Forums
Terraria Xbox 1.2.4: Iron Crate Opening - HARDMODE - 99 Crates - YouTube
Underestimating Crates... | Terraria Community Forums