enabled: true
block: {
  location: gravel
}
source: [
  stone
  netherrack
]
gen: [
  {
    height: [ 0, 256 ]
    size: 33
    count: 8
    stage: UNDERGROUND_ORES
    blacklistBiomes: true
    biomes: {
      types: [
        NETHER
        THE_END
      ]
    }
  }
  {
    height: [ 5, 37 ]
    size: 33
    count: 2
    stage: UNDERGROUND_DECORATION
    biomes: {
      names: [
        soul_sand_valley
        nether_wastes
        crimson_forest
        warped_forest
      ]
    }
  }
]