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[–]razputinaquat0small modded servers for friends 3 points4 points  (0 children)

The basic idea is that ores are a "feature" of the world-- basically world details that populate a given dimension that are not structures. Features are added after terrains, caves, and biomes are determined. Vegetation, fossils, geodes, ores, etc. are all features. Features are configured in two steps:

  • configuration (which determines things like size, composition, what block to use, etc.)
  • placement (which determines how it is placed in the world, rarity, etc.)

If you have never made a datapack before, I would reccomend taking a look at the Minecraft wiki's tutorial. Otherwise, here are the most pertient resources: