Q: What does this actually replace?
A: For now only Iron Ore's been replaced, but there are no variants, and each stage is just the highest one with parts taken out. Over the next few days I plan on fixing both by adding better visual change. Stages will be similar in how they look, variants will be roughly different.

Q: What's next?
A: Probably Copper Ore, or Trees, depends on what I feel like doing next after fully doing Iron Ore.