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  "company_name": "JX金属",
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  "updated": "2026-08-13",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/5016/",
  "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",
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  "timeline": [
    {
      "date": "1905/12",
      "importance": 3,
      "event": "日立鉱山(茨城県)操業開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1908/11",
      "importance": 1,
      "event": "大雄院製錬所(現 茨城事業所日立地区)操業開始",
      "source": "有価証券報告書"
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    {
      "date": "1912/9",
      "importance": 2,
      "event": "久原鉱業設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1916/9",
      "importance": 2,
      "event": "佐賀関製錬所(大分県)操業開始により金属製錬事業を拡張",
      "source": "有価証券報告書"
    },
    {
      "date": "1928/12",
      "importance": 2,
      "event": "日本産業に商号変更",
      "source": "有価証券報告書"
    },
    {
      "date": "1929/4",
      "importance": 2,
      "event": "日本産業の鉱山・製錬部門を分離し日本鉱業を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1948/2",
      "importance": 1,
      "event": "東邦商事(現 JX金属商事)設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1964/10",
      "importance": 2,
      "event": "倉見工場(神奈川県)開設により金属加工事業に参入",
      "source": "有価証券報告書"
    },
    {
      "date": "1978/3",
      "importance": 2,
      "event": "日立事業所にリサイクル炉を新設しリサイクル事業を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1981/9",
      "importance": 2,
      "event": "日立鉱山、鉱量枯渇により閉山",
      "source": "有価証券報告書"
    },
    {
      "date": "1985/5",
      "importance": 3,
      "event": "磯原工場(茨城県)開設により電子材料事業に参入",
      "source": "有価証券報告書"
    },
    {
      "date": "1989/10",
      "importance": 1,
      "event": "ニッポン・マイニング台湾(現 台湾日鉱金属)設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1992/5",
      "importance": 2,
      "event": "(旧)日鉱金属設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1992/11",
      "importance": 2,
      "event": "日本鉱業が金属資源開発・金属・金属加工の3部門を(旧)日鉱金属に譲渡",
      "source": "有価証券報告書"
    },
    {
      "date": "1992/12",
      "importance": 1,
      "event": "日本鉱業が共同石油を合併し日鉱共石に商号変更",
      "source": "有価証券報告書"
    },
    {
      "date": "1993/12",
      "importance": 1,
      "event": "ジャパンエナジーに商号変更",
      "source": "有価証券報告書"
    },
    {
      "date": "1998/8",
      "importance": 2,
      "event": "(旧)日鉱金属、東京証券取引所第一部に上場",
      "source": "有価証券報告書"
    },
    {
      "date": "1999/4",
      "importance": 2,
      "event": "ジャパンエナジーの電子材料事業を分離し日鉱マテリアルズを設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2000/10",
      "importance": 2,
      "event": "(旧)日鉱金属と三井金属鉱業の合弁でパンパシフィック・カッパー設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2002/9",
      "importance": 2,
      "event": "ジャパンエナジーと(旧)日鉱金属が株式移転で新日鉱ホールディングスを設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2006/4",
      "importance": 2,
      "event": "日鉱マテリアルズが(旧)日鉱金属と日鉱金属加工を合併し(新)日鉱金属に商号変更",
      "source": "有価証券報告書"
    },
    {
      "date": "2010/4",
      "importance": 3,
      "event": "新日鉱ホールディングスと新日本石油が株式移転でJXホールディングスを設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2010/7",
      "importance": 2,
      "event": "新日鉱ホールディングスが(新)日鉱金属を合併しJX日鉱日石金属に商号変更",
      "source": "有価証券報告書"
    },
    {
      "date": "2014/7",
      "importance": 2,
      "event": "チリ・カセロネス銅鉱山の開山式を挙行",
      "source": "有価証券報告書"
    },
    {
      "date": "2016/1",
      "importance": 2,
      "event": "JX金属に商号変更",
      "source": "有価証券報告書"
    },
    {
      "date": "2018/6",
      "importance": 2,
      "event": "東邦チタニウムの株式50.38%を取得し子会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2018/7",
      "importance": 2,
      "event": "独H. C. Starck Tantalum & Niobiumを子会社化しレアメタル事業を強化",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/8",
      "importance": 1,
      "event": "カナダのeCycle Solutionsを子会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/9",
      "importance": 2,
      "event": "韓国LS-Nikko Copperの保有株式49.9%を譲渡",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/7",
      "importance": 3,
      "event": "チリ・カセロネス銅鉱山権益51%をLundin Miningに譲渡",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/12",
      "importance": 1,
      "event": "JX金属プレシジョンテクノロジーの株式の過半を譲渡",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/3",
      "importance": 2,
      "event": "パンパシフィック・カッパー株式20%とロス・ペランブレス鉱山権益を丸紅に譲渡",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/5",
      "importance": 1,
      "event": "英文商号をJX Advanced Metalsに変更",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/8",
      "importance": 2,
      "event": "タツタ電線の公開買付が成立し子会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2025/3",
      "importance": 3,
      "event": "東京証券取引所プライム市場に上場",
      "source": "有価証券報告書"
    },
    {
      "date": "2026/2",
      "importance": 2,
      "event": "東邦チタニウムと株式交換契約及び経営統合契約を締結",
      "source": "有価証券報告書"
    }
  ]
}