[
  {
    "type": "construction",
    "id": "constr_extract_bog_iron",
    "group": "extract_bog_iron",
    "category": "OTHER",
    "required_skills": [ [ "survival", 0 ] ],
    "time": "5 h",
    "qualities": [ [ { "id": "DIG", "level": 1 } ] ],
    "byproducts": [ { "item": "iron_ore", "count": [ 40, 60 ] } ],
    "pre_terrain": "t_bog_iron",
    "post_special": "done_extract_maybe_revert_to_dirt"
  },
  {
    "type": "construction",
    "id": "constr_bloomery",
    "group": "build_bloomery",
    "category": "FURN",
    "required_skills": [ [ "fabrication", 5 ] ],
    "time": "120 m",
    "qualities": [ [ { "id": "DIG", "level": 1 } ], [ { "id": "HAMMER", "level": 2 } ] ],
    "components": [ [ [ "rock", 30 ] ], [ [ "clay_lump", 10 ] ] ],
    "pre_note": "Can be deconstructed without tools.",
    "pre_special": "check_empty",
    "post_terrain": "f_bloomery"
  }
]
