Apr 1983 Joined the Company Apr 2001 Vancouver Office Manager, Raw Materials Business Division, Metals Company Aug 2004 General Manager, Resources and Raw Materials Department, Metals Company Apr 2006 General Manager, Planning Office, Metals Company Oct 2006 Director and General Manager, Planning Office, DOWA Metal Mines Co., Ltd. Apr 2011 Representative Director and President, Kosaka Smelting & Refining Co., Ltd. Apr 2013 Executive Officer and Representative Director and President, DOWA Metal Mines Co., Ltd. Apr 2018 Senior Executive Officer and Executive Vice President, the Company Apr 2018 President, Japan Mining Industry Association (until Mar 2019) Jun 2018 Representative Director and President, the Company Apr 2024 President, Japan Mining Industry Association (until Mar 2025) Jun 2025 Representative Director, President and Executive Officer, CEO, the Company (current)

Apr 1985 Joined the Company Mar 2007 General Manager, Zinc Business Division, DOWA Metal Mines Co., Ltd. Apr 2008 Director and General Manager, Zinc Business Division, DOWA Metal Mines Co., Ltd. Apr 2011 Director and General Manager, Planning Office, DOWA Metal Mines Co., Ltd. Apr 2018 General Manager, Human Resources and Development Division, the Company Apr 2021 Executive Officer and General Manager, Human Resources Department, the Company Jun 2022 Director and General Manager, Human Resources Department, in charge of General Affairs and Legal, the Company Jun 2022 Director, DOWA Metal Mines Co., Ltd. (current); Director, DOWA Management Service Co., Ltd. (current) Jun 2025 Director, Managing Executive Officer, CHRO, in charge of Human Resources and General Affairs and Legal Departments, the Company (current)

Jul 1991 Joined the Company Jun 2008 Director, DOWA Ohlin Metal Co., Ltd. Apr 2012 Representative Director and President, DOWA Ohlin Metal Co., Ltd. Apr 2016 Director and General Manager, Planning Office, DOWA Metaltech Co., Ltd. Apr 2018 General Manager, Planning and Public Relations Division, the Company Apr 2018 Director, DOWA Electronics Materials Co., Ltd. (current); Director, DOWA Metaltech Co., Ltd. (current) Apr 2021 Executive Officer, General Manager of Corporate Planning Department and General Manager of Sustainability Promotion Office, General Manager of Public Relations and IR Office, the Company Jun 2022 Director, General Manager of Corporate Planning Department and General Manager of Sustainability Promotion Office, General Manager of Public Relations and IR Office, in charge of Accounting and Finance, the Company Apr 2023 Director, General Manager of Corporate Planning Department and General Manager of Public Relations and IR Office, in charge of Accounting and Finance, the Company Jun 2025 Director, Managing Executive Officer, CFO, in charge of Corporate Planning, Accounting and Finance Departments, the Company (current)

Apr 1981 Joined Nippon Steel Mining Co., Ltd. Jun 2007 General Manager, Kyushu Branch, Nippon Steel Mining Co., Ltd. Jun 2010 General Manager, Resources Sales Department, Head Office, Nippon Steel Mining Co., Ltd. Jun 2011 Director, in charge of Metals Sales Department and General Manager, Resources Sales Department, Nippon Steel Mining Co., Ltd. Jun 2012 Managing Director, in charge of Accounting, Resources Sales and Metals Sales Departments, Nippon Steel Mining Co., Ltd. Jun 2013 Senior Managing Director, Nippon Steel Mining Co., Ltd. Apr 2015 President, Nippon Steel Mining Co., Ltd. May 2019 Director, Nippon Steel Mining Co., Ltd. Jun 2019 Adviser, Nippon Steel Mining Co., Ltd. Mar 2021 Honorary Adviser, Nippon Steel Mining Co., Ltd. (current) Jun 2021 Director, the Company (current)

Apr 1999 Joined Kubota Corporation Apr 2000 Research Assistant, Faculty of Engineering and Resource Science, Akita University Feb 2003 Associate Professor, Faculty of Engineering and Resource Science, Akita University Apr 2007 Associate Professor, Faculty of Engineering and Resource Science, Akita University Apr 2009 Professor, Faculty of Engineering and Resource Science, Akita University Apr 2010 Professor, Graduate School of Engineering and Resource Science, Akita University Apr 2014 Professor, Faculty of International Resource Sciences, Akita University (current) Apr 2016 Professor, Graduate School of International Resource Sciences, Akita University (current) Feb 2019 Director, The Society of Environmental and Resource Engineering Mar 2020 Executive Director, Process and Materials Division Committee Group Head, The Society of Materials and Resources Mar 2022 Executive Director, Tohoku Branch Chief, Education Center, and in charge of Education and Human Resource Development, The Society of Materials and Resources Jun 2022 Vice President, The Society of Environmental and Resource Engineering Jun 2023 Director, the Company (current) Mar 2024 Executive Director, Education Center, and in charge of Education and Human Resource Development, The Society of Materials and Resources (current) Apr 2024 Dean, Faculty of International Resource Sciences, and Dean, Graduate School of International Resource Sciences, Akita University Jun 2024 President, The Society of Environmental and Resource Engineering (current); Representative Director, The Society of Environmental and Resource Engineering (current)

Apr 1979 Joined Nippon Telegraph and Telephone Public Corporation (now NTT, Inc.) Mar 1993 General Manager, Corporate Communications Sales Department, Omiya Branch, NTT Jul 1995 Head of Multimedia Training Division, Human Resources Department and Central Training Center, NTT Jul 1997 Deputy General Manager, Overseas Solutions Business Division, International Headquarters, NTT Jul 1999 General Manager, Consumer and Office Business Division, NTT Communications Corporation Apr 2004 Head of Incubation Development Division, NTT Resonant Inc. Apr 2007 General Manager, Information and Communications Research Department, Multimedia Promotion Center Foundation Jun 2014 Full-time Audit & Supervisory Board Member, NTT East Corporation - Minami-Kanto Jun 2019 Outside Director, Nippon Soda Co., Ltd. (until Jun 2022) Jun 2024 Director, the Company (current) Mar 2025 Outside Director, Nikkiso Co., Ltd. (current)

Apr 1992 Joined the Company Apr 2008 Director, Smelting Technology Research Institute, DOWA Metal Mines Co., Ltd. Apr 2010 Director, Akita Zinc Recycling Co., Ltd. (now Akita Smelting Co., Ltd.) Jun 2013 Representative Director, Akita Zinc Recycling Co., Ltd. Apr 2016 General Manager, Technology Division, the Company Apr 2019 Director and General Manager, Zinc Business Division, DOWA Metal Mines Co., Ltd. Apr 2022 Representative Director and President, Akita Smelting Co., Ltd. Apr 2024 Executive Officer and Representative Director and President, DOWA Metal Mines Co., Ltd. Apr 2026 Deputy President and Executive Officer, the Company (current)

Apr 1989 Joined the Company Jul 2006 Director, Magnetic Materials Research Institute, Functional Materials Business Division, DOWA Electronics Materials Co., Ltd. Apr 2016 General Manager, Planning Office, DOWA Electronics Materials Co., Ltd. Apr 2018 Director and General Manager, Planning Office, DOWA Electronics Materials Co., Ltd. Apr 2020 Managing Director, DOWA Electronics Materials Okayama Co., Ltd. Apr 2025 Director, DOWA Electronics Materials Co., Ltd., in charge of Technology for Business Subsidiaries Apr 2026 Executive Officer, the Company; Assistant to in charge of Business Development and Intellectual Property Departments (current)

Feb 2002 Joined the Company Apr 2009 General Manager, Western Production Technology Center, DOWA Technology Co., Ltd. Feb 2010 General Manager, Planning Department, DOWA Technology Co., Ltd. Apr 2016 Director, Kosaka Smelting & Refining Co., Ltd.; General Manager, Northern Production Technology Center, DOWA Technology Co., Ltd. Apr 2018 Director and General Manager, Production Technology Department, Kosaka Smelting & Refining Co., Ltd.; Representative Director and President, Akita Kogyo Co., Ltd. Apr 2021 Director and General Manager, Production Technology Department, Kosaka Smelting & Refining Co., Ltd. Apr 2026 Executive Officer, the Company; Assistant to in charge of Quality Assurance and Environment and Safety Departments (current)

Apr 1998 Registered as Attorney-at-Law Apr 1998 Joined Nishimura & Partners (now Nishimura & Asahi, Foreign Law Joint Enterprise) Dec 2014 Joined City-Yuwa Partners Jun 2017 Member of the Board of Trustees, Foundation for International Commercial and Civil Law (current) Jan 2018 Part-time Lecturer, Graduate School of Tsukuba University (current) Jun 2020 Outside Corporate Auditor, Alconix Corporation (current) Jun 2021 Outside Director, Denki Kogyo Co., Ltd. (until Jun 2025) Jan 2022 Councilor, Automobile Accident Compensation Insurance Council, Financial Services Agency (current) Nov 2022 Outside Director (Audit and Supervisory Committee Member), Japan Airport Terminal Co., Ltd. (current) Jan 2023 Partner, City-Yuwa Partners (current) Mar 2023 Outside Director, Komazawa University (current)

Apr 1979 Joined The Long-Term Credit Bank of Japan, Ltd. Jun 1998 General Manager, Sales Department, New York Branch, and Head, Chicago Office, The Long-Term Credit Bank of Japan, Ltd. Sep 1999 Managing Director, Commercial Finance Division, GE Capital Japan May 2002 Executive Vice President and Partner, Lone Star Japan Acquisitions, Ltd. Mar 2012 Senior Advisor, Lincoln International K.K. Apr 2016 Director and Chief Representative, TX Entrepreneur Partners (current) Oct 2019 Member, Committee on Securities Handling, Chiba University (current) Jan 2020 Outside Corporate Auditor, EQIQ Co., Ltd. (until Mar 2023) Apr 2020 Visiting Professor, Graduate School of Accounting and Finance, Chiba University of Commerce (current) Dec 2024 Outside Corporate Auditor, Eurus Therapeutics K.K. (current)

Apr 1987 Joined the Company Apr 2007 General Manager, Business Planning Department, Administration Division, DOWA Thermotech Co., Ltd. Apr 2011 Director and General Manager, Planning Office, DOWA Thermotech Co., Ltd. Apr 2013 Director and General Manager, General Affairs Department, Kosaka Smelting & Refining Co., Ltd. Apr 2018 Managing Director and General Manager, General Affairs Department, Kosaka Smelting & Refining Co., Ltd. Apr 2022 Senior Managing Director and General Manager, General Affairs Department, Kosaka Smelting & Refining Co., Ltd. Apr 2024 Deputy President, Director, DOWA Management Service Co., Ltd. Jun 2025 Corporate Auditor, the Company (current)

Apr 1995 Joined Asahi & Co. (now Ernst & Young ShinNihon LLC), Tokyo Office Jan 2005 Joined Ernst & Young ShinNihon LLC, Osaka Office Apr 2015 Ernst & Young ShinNihon LLC, Tokyo Office Jul 2019 Ernst & Young ShinNihon LLC, Advisory Business Division Jul 2023 Established Azusa Tsutsumi Certified Public Accountant Office (current) Jun 2024 Corporate Auditor, the Company (current)

Apr 1992 Registered as Attorney-at-Law Apr 1992 Joined Marunouchi Sogo Law Office Jan 2005 Partner, Marunouchi Sogo Law Office (current) Oct 2014 Examiner, National Bar Examination (Labor Law) Mar 2015 Outside Director, Keiba Security Service Co., Ltd. (until Mar 2025) May 2018 Outside Director, Yukijirushi Shubyo Co., Ltd. (current) Jun 2023 Corporate Auditor, the Company (current)

Apr 1985 Joined Fujita Kanko Inc. May 2002 Group Leader, Property Management Group, Corporate Center, Fujita Kanko Inc. Mar 2004 General Manager, Real Estate Center, Corporate Center, Fujita Kanko Inc. Nov 2006 General Manager, Customer Center, Fujita Kanko Inc. Mar 2007 Group Leader, Planning Group, Planning Office, Washington Company, Fujita Kanko Inc. Jan 2008 General Manager, Planning Office, Washington Company, Fujita Kanko Inc. Dec 2008 Director, Fujita Green Service Co., Ltd. (now Green Service Co., Ltd.) Mar 2012 Representative Director and President, Fujita Green Service Co., Ltd. Mar 2015 Representative Director and Vice President, Faiton Co., Ltd. Apr 2017 Officer in charge of Property and Related Businesses, Management Group, Fujita Kanko Inc. Mar 2019 Representative Director and President, Faiton Co., Ltd. Mar 2023 Corporate Auditor, Fujita Kanko Inc. (current) Jun 2023 Corporate Auditor, the Company (current)