{
  "entries": [
    {
      "roll": {
        "type": "uniform",
        "min": 1,
        "max": 1
      },
      "pool": [
        { "weight": 70,
          "pool": [
            {
              "weight": 100,
              "item": {
                "id": "minecraft:exposed_copper",
                "count": {
                  "type": "uniform",
                  "min": 1,
                  "max": 1
                }
              }
            },
            {
              "weight": 100,
              "item": {
                "id": "minecraft:emerald",
                "count": {
                  "type": "uniform",
                  "min": 2,
                  "max": 8
                }
              }
            }
          ]
        }
      ]
    }
  ]
}