Best Iron Levels Minecraft 1 18. These blobs are found between the height levels y = 256 and y = 0. All of this has changed with the release of minecraft 1.18, however.
The best level to mine iron in minecraft 1.18 update is y = 232. As of the minecraft 1.18 caves and cliffs part 2 update, coal ore has become much more common and will generate in large blobs. There was no variety in block height aside from the much newer copper which was more likely to be found around y=48.