By Hogofwar (creator of the Fossils mod)
Download (Don't forget Modloader!)
What is Biome Caves?
Biome Caves is simply a mod that makes all the caves generated in a snow biome made of ice and all caves generated in desert chunks into sand/sandstone (32% chance of spawning sandstone).
This also includes a modification to ice, causing them to not turn into water when in a cold biome and adding the ability to put anything on them (so you can easily put torches down in ice caves)
Don't worry, ores won't be covered up (except for when sand falls). Also, the mod only detects caves below level 63, so there won't be any above ground ice caves.
This mod also adds ice and sand dungeons which generate within their respective biomes, but with the same loot as normal.
Installation (the usual)
(Make sure to install Modloader before this)
1) Open up %appdata%, if you don't know how to do this, start>run, then type in %appdata%
2) Browse to .minecraft/bin
3) Open up minecraft.jar with WinRAR or 7zip.
4) Drag and drop (AKA copy) the files in the zip into the jar.
5) Delete the META-INF folder in the jar.
6) Run Minecraft and enjoy!
Download Biome Caves for 1.7.3:
Direct | Adf.ly