Custom Ore Veins

Veins are added by datapack, so a pack author can create new vein types without changing code. A datapack controls which dimension types a vein generates in, and the regions of the world it may fill. A vein can be given a minimum and a maximum Y level, and a minimum and a maximum value for the density functions that decide where it appears. Two optional value limits can be set on their own, and a toggle turns each density function on or off.

Shape and content are set per vein. One setting determines the shape of the vein, and the vein can replace the stone that surrounds it, or a different base rock block. Ore blocks, raw ore blocks and the chance of each ore appearing in the outer and inner parts of a vein are all configurable. A redstone vein example datapack is included to show how a vein is written. The authors advise against using the same shape as vanilla copper and iron veins, because the two would overlap.

Custom Ore Veins is a server-side mod: the server needs it, and players join without installing anything. It is published for Fabric, Forge and NeoForge, with files for 1.20 – 1.21.5. The mod is open source under the MIT License, and its source code and issue tracker are public.