{
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  "endpoint": "timeline",
  "stock_code": "1515",
  "company_name": "日鉄鉱業",
  "content_lang": "ja",
  "meta_lang": "en",
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  "api_url": "/api/1515/timeline.json",
  "updated": "2026-08-17",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/1515/",
  "source": {
    "primary": [
      "有価証券報告書"
    ],
    "extraction": "有価証券報告書の沿革を基礎に、社史・報道で補完",
    "row_field": "source"
  },
  "timeline": [
    {
      "date": "1939/5",
      "importance": 3,
      "event": "旧日本製鐵の鉱山部門の分離独立により日鉄鉱業設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1943/2",
      "importance": 1,
      "event": "東鹿越採石所を開設",
      "source": "有価証券報告書"
    },
    {
      "date": "1950/10",
      "importance": 2,
      "event": "津久見採石所（現・大分事業所）を開設",
      "source": "有価証券報告書"
    },
    {
      "date": "1951/11",
      "importance": 2,
      "event": "関東証券の経営に参画",
      "source": "有価証券報告書"
    },
    {
      "date": "1954/3",
      "importance": 1,
      "event": "東京証券取引所第一部に上場",
      "source": "有価証券報告書"
    },
    {
      "date": "1956/5",
      "importance": 2,
      "event": "幸袋工作所への資本参加により機械事業へ参入",
      "source": "有価証券報告書"
    },
    {
      "date": "1958/4",
      "importance": 1,
      "event": "尻屋鉱業所を開設",
      "source": "有価証券報告書"
    },
    {
      "date": "1959/5",
      "importance": 1,
      "event": "三鷹研究所を開設",
      "source": "有価証券報告書"
    },
    {
      "date": "1968/11",
      "importance": 2,
      "event": "三井金属鉱業との共同出資により日比共同製錬を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1971/4",
      "importance": 2,
      "event": "鳥形山鉱業所を開設",
      "source": "有価証券報告書"
    },
    {
      "date": "1972/6",
      "importance": 3,
      "event": "伊王島鉱業所の閉山をもって石炭生産部門から撤退",
      "source": "有価証券報告書"
    },
    {
      "date": "1973/10",
      "importance": 1,
      "event": "機械営業部門を設置",
      "source": "有価証券報告書"
    },
    {
      "date": "1979/3",
      "importance": 3,
      "event": "釜石鉱業所の廃止と釜石鉱山の設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1985/4",
      "importance": 2,
      "event": "化成品部門を設置",
      "source": "有価証券報告書"
    },
    {
      "date": "1989/4",
      "importance": 2,
      "event": "不動産事業部門を設置",
      "source": "有価証券報告書"
    },
    {
      "date": "1990/2",
      "importance": 2,
      "event": "新日本製鐵との共同出資により日鉄鹿児島地熱を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1997/3",
      "importance": 2,
      "event": "オーストラリアにポート・ケンブラ・カパー社を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1998/5",
      "importance": 1,
      "event": "袖ヶ浦物流センターを開設",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/1",
      "importance": 3,
      "event": "アタカマ銅鉱山（チリ）の操業を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "2006/6",
      "importance": 2,
      "event": "ポート・ケンブラ・カパー社の経営から撤退",
      "source": "有価証券報告書"
    },
    {
      "date": "2008/4",
      "importance": 2,
      "event": "北海道共同石灰（現・北海道石灰化工）の全株式を取得",
      "source": "有価証券報告書"
    },
    {
      "date": "2008/6",
      "importance": 2,
      "event": "堂島関東証券株式の売却により証券事業から撤退",
      "source": "有価証券報告書"
    },
    {
      "date": "2013/4",
      "importance": 1,
      "event": "鹿児島事業所を開設",
      "source": "有価証券報告書"
    },
    {
      "date": "2013/9",
      "importance": 2,
      "event": "再生可能エネルギー事業部門を設置",
      "source": "有価証券報告書"
    },
    {
      "date": "2013/10",
      "importance": 2,
      "event": "住金鉱業（現・八戸鉱山）の株式を新日鐵住金から取得",
      "source": "有価証券報告書"
    },
    {
      "date": "2017/10",
      "importance": 2,
      "event": "アルケロス鉱山（チリ）の株式を追加取得して子会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/4",
      "importance": 1,
      "event": "東京証券取引所プライム市場へ移行",
      "source": "有価証券報告書"
    }
  ]
}