[
  {
    "type": "item_group",
    "id": "cave_minerals",
    "subtype": "distribution",
    "copy-from": "cave_minerals",
    "extend": {
      "entries": [
        { "item": "coal_lump", "prob": 20, "count": [ 1, 10 ] },
        { "item": "rock", "prob": 40, "count": [ 1, 10 ] },
        { "item": "rock_large", "prob": 10, "count": [ 1, 10 ] },
        { "item": "rock_flaking", "prob": 20, "count": [ 1, 10 ] },
        { "item": "material_shrd_limestone", "prob": 40, "count": [ 1, 10 ] },
        { "item": "material_limestone", "prob": 40, "count": [ 1, 10 ] },
        { "item": "material_niter", "prob": 5, "count": [ 1, 10 ] },
        { "item": "chunk_sulfur", "prob": 5, "count": [ 1, 10 ] },
        { "item": "material_rocksalt", "prob": 5, "count": [ 1, 10 ] },
        { "item": "material_rhodonite", "prob": 5, "count": [ 1, 10 ] },
        { "item": "material_zincite", "prob": 5, "count": [ 1, 10 ] },
        { "item": "iron_ore", "count": [ 0, 5 ], "prob": 5 },
        { "item": "chunk_copper", "count": [ 0, 3 ], "prob": 15 },
        { "item": "chunk_silver", "count": [ 0, 2 ], "prob": 5 },
        { "item": "chunk_gold", "count": [ 0, 2 ], "prob": 3 },
        { "item": "chunk_aluminum", "count": [ 0, 3 ], "prob": 3 },
        { "item": "chunk_cassiterite", "count": [ 2, 4 ], "prob": 10 },
        { "item": "chunk_galena", "count": [ 2, 4 ], "prob": 10 },
        { "item": "chunk_hematite", "count": [ 2, 2 ], "prob": 10 }
      ]
    }
  }
]
