YUNG’s Better Mineshafts adds 9 new biomes to mineshafts alongside some major updates that give them more life or lack thereof in the case of them being abandoned. The mod expands existing mineshafts to make them more interesting and adds more structures to make them more realistic. You’ll notice right away the vertical tunnel that can go down an incredible distance.
The shafts are much more detailed now and show more evidence that they were once occupied. They’re also wider and taller with more artifacts to find.
The new biomes correlate to the biomes they are under. So if you’re near a desert or tundra, the mineshaft could be made of sandstone or covered in snow and ice. And jungle mineshafts are full of vines up the walls.
You may come across abandoned workstations and outposts and there are even certain tunnels that end with large veins of certain ores!