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So I spent forever trying to figure this out so hopefully this solves the problem for those of you in the same situation. So we use the BiomeLoadingEvent to catch when biomes are loading and add our ConfiguredFeature. Ore Generation like so: public class WorldGen { public static final ConfiguredFeature<?, ?> yourOre = Feature.ORE.withConfiguration( new OreFeatureConfig(OreFeatureConfig.FillerBlockType.BASE_STONE_OVERWORLD, YourRegistryHandler.YOUR_ORE.get().getDefaultState(), 4)) //vein size .range(12).square() //maximum y level where ore can spawn .count(3); //how many veins maximum per chunck public static void generateOre(final BiomeLoadingEvent event) { BiomeGenerationSettingsBuilder generation = event.getGeneration(); if (event.getCategory().equals(Biome.Category.ICY)) { //OPTIONAL IF STATMENT allows you to generate ores in specfifc biome types for exmaple icy biomes generation.withFeature(GenerationStage.Decoration.UNDERGROUND_ORES, yourOre); } } } Now we need to know where to register this event do NOT use EventBus it will crash your mod on startup by trying to register generation before registering your ore block instead we register this in our main class like so: //if you use the mdk this function will be pre generated so we only add our refrence here private void setup(final FMLCommonSetupEvent event) { // some preinit code LOGGER.info("HELLO FROM PREINIT"); LOGGER.info("DIRT BLOCK >> {}", Blocks.DIRT.getRegistryName()); MinecraftForge.EVENT_BUS.addListener(EventPriority.HIGH, WorldGen::generateOre); //our refrence } ALTERNITIVE use if you are generating a bunch of ores in the same way