Technic-Server-1.12.2/overrides/config/oreexcavation_overrides.json

{
  "overrides": [
    {
      "itemID": "examplemod:nerfed_pickaxe:0",
      "speed": 1,
      "limit": 0,
      "range": 0,
      "exaustion": 0.1,
      "experience": 0,
      "gamestage": ""
    }
  ]
}