{
  "stock_code": "5706",
  "company_name": "三井金属鉱業",
  "company_color": "#68B992",
  "industry": "metal",
  "published": "2026-02-21",
  "updated": "2026-05-19",
  "found": {
    "year": 1892,
    "location": "東京都",
    "founder": "※三井財閥"
  },
  "listing": {
    "listed_year": 1952,
    "delisted_year": null,
    "unlisted": false
  },
  "is_publish": true,
  "old_name": "神岡鉱業",
  "name_kana": "ミツイキンゾクコウギョウ",
  "old_name_kana": "カミオカコウギョウ"
}