{
  "format_version": "1.13.0",
  "minecraft:feature_rules": {
    "description": {
      "identifier": "minecraft:mountains_underground_coal_ore_feature",
      "places_feature": "minecraft:coal_ore_feature"
    },
    "conditions": {
      "placement_pass": "underground_pass",
      "minecraft:biome_filter": {
        "test": "has_biome_tag",
        "operator": "==",
        "value": "mountains"
      }
    },
    "distribution": {
      "iterations": 20,
      "coordinate_eval_order": "zyx",
      "x": {
        "distribution": "uniform",
        "extent": [ 0, 16 ]
      },
      "y": {
        "distribution": "uniform",
        "extent": [ 128, 256 ]
      },
      "z": {
        "distribution": "uniform",
        "extent": [ 0, 16 ]
      }
    }
  }
}
