Is there a Minecraft mod like Total Miner that adds more ground levels to mine? One that adds more ores or stone types + underground biome generation?
I've been searching for a couple of days now and I can't seem to find one.
If not is there a map that does a similar thing?
If you're willing to risk an "alpha" mod that has lots of compatibility issues with other mods (which I'm guessing are mostly due to assumptions said other mods make about coordinate limits), you could look into OpenCubicChunks.