Massive, highly configurable ore veins

https://modrinth.com/mod/large-ore-veins

I always really liked the massive ore veins in GregTech, and wanted a standalone version of this for use in my own modpack. So I made a mod that replaces Minecraft's default ore generation with massive veins. It encourages the player to explore caves and seek out biomes where certain veins are more common.

Everything is completely configurable using datapacks. You can change the rarity, size, shape, Y levels, biome rarities and more of any existing vein, remove veins or add your own veins with modded ores. Veins can generate in any vanilla or modded dimension (although I can't guarantee every modded dimension will work). Although the default vanilla ore generation is disabled, modded ores are untouched so this will be compatible with most mods out of the box.

The mod can run server-side only, but also has JEI integration if installed on the client. If you click an ore in JEI, you can see information about the vein(s) it generates in.

The mod is available for 1.21.1 neoforge. It's still in beta and might still have some bugs (please make backups!), but I'm working on it as I work on my modpack and should have a full release in the next few weeks.