Here comes the biggest update this mod has ever received, Caves! :o

I've spent some time implementing full cave generation, new blocks, new structures, and some blanket mod improvements:

Caves

• Added full cave generation to the main salt flats biome (coming to shattered salt flats later)
  • Caves generate with iron and silver ore (which are both new marble blocks), water ponds, muddy plants, and other resources
  • New mobs spawn in the underground, such as skeletons, rats, goblins, fish, and ghouls
• Caves have three cave biomes: Basic Caves, Shimmering Caves, and Infested Caves
  • Shimmering Caves are glowing cave systems with white crystals, dead coral, and new ruin structures which contain loot, though with skeletons on watch
  • Infested Caves are overgrown caves filled with mushroom and a new blockset: White Moss

Mineshafts

• Added a new procedural structure: Mineshafts
  • Generate on the surface of the salt flats, with a large shaft that allows for easy access to the underground
  • Branching tunnels give easy access to more ores and cave systems
  • (Loot chests and more structure variants to come later)

Improvements and Fixes

• Revamped sandstorms in the salt flats, they are now white instead of yellow and better match the environment
• Hawks can now spawn on the surface of the salt flats
• Better organized some of the mod's files

One last note, if you have any ideas for some completely custom loot items that players could find in the salt flats, please suggest them to me!