Calcite Veins: Motherlode-Style Regional Ores for Chunk Mining

Vanilla ore motherlodes are swapped for wide veins built from calcite, meant to reward cave exploration and long-term mining projects. Each vein spreads its ores over a large area instead of forming a small blob. The mod is server-side only, so players join without installing it, and it requires Fabric API on Fabric. Files cover 1.20.1 only, and the latest is 1.0.2-1.20.1 for 1.20.1, published 2026-01-20.

Vein size varies greatly. A small vein may hold only about ten ores, while a larger one can contain well over a thousand, so excavating a big deposit works as a long-term hub rather than a quick resource. Veins are generated from noise maps spread fairly evenly across chunks, which keeps outcomes unpredictable. Each ore type generates at its own height band, and Nether gold, nuggets and quartz follow the same method through blackstone veins, with some appearing near the bedrock ceiling. The source is mostly datapack-driven, and Java code only edits the vanilla motherlode generation and hardcodes calcite, so the data folder is where ore generation can be customised or new ores added.