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Our leadership

Regional executive committee

JOSHUA MORTOTI EVP and Head of West Africa
MICHIEL VAN DER MERWE Acting Vice President - Operations
STEPHEN OSEI-BEMPAH General Manager, Tarkwa Mine
CHARLES KOFI NTI Acting General Manager, Damang Mine
CASPER DZORMEKU Asanko Joint Venture Manager and Regional Metallurgical Lead
CATHERINE ABADJI Vice President and Head of Human Resources and Corporate Affairs
LINDLEY WITBOOI Vice President and Head of Finance
DR CELESTINA ALLOTEY Vice President and Head of Sustainable Development
MICHAEL EDEM AKAFIA Vice President and Head of Legal and Compliance
JOHANNES DE BEER Vice President and Head of Engineering Projects
MATT HAAS Acting Vice President - Technical Services

ALFRED BAKU

Executive Vice President and Head of West Africa

Executive Education Programme, Darden School of Business, University of Virginia, USA; MSc, Mining Engineering, Kwame Nkrumah University of Science and Technology (KNUST); Statutory Mines Manager Certificate, Minerals Commission Ghana; First Vice President, Ghana Chamber of Mines; Member, Australasia Institute of Mining and Metallurgy (AusIMM).

With over two decades of experience in mining engineering, Alfred Baku rose through the ranks to become the Executive Vice President and Head of Gold Fields West Africa. Alfred joined Gold Fields in 2002 as a Mining Engineer. In 2004, he worked as a Senior Mining Engineer at Gold Fields' Agnew Mine in Western Australia. He also worked at Gold Field's St. Ives Mine in Australia in 2005.

Alfred returned to Ghana in 2007 to head the Mining Department of the Damang Mine, and was appointed General Manager of the mine in November 2008. He became the General Manager of the Tarkwa Mine in 2010 and subsequently, the Vice President of Operations for both mines. In 2013, Alfred was promoted to Senior Vice President for West Africa and became a member of Gold Fields Group's Executive Committee. In February 2014, he was appointed the Executive Vice President and Head of Gold Fields West Africa.

Prior to joining Gold Fields, Alfred worked in Australia for Billiton and Ranger Minerals in production and mine planning engineering capacities. As the First Vice President of the Ghana Chamber of Mines, Alfred serves on the Advisory Board of the Ministry of Lands and Natural Resources.

MICHIEL VAN DER MERWE

Acting Vice President - Operations

B. Eng. (Extractive Metallurgy), University of Pretoria; Statutory Mines Manager's Certificate, Minerals Commission of Ghana.

Michiel van der Merwe is a Metallurgical Engineer with over 24 years' experience in the mining industry. He was appointed Acting Vice President – Operations in January 2022. Michiel joined Gold Fields as General Manager of the Tarkwa mine in January 2012. He was later appointed General Manager of the Damang mine in January 2016. Michiel has played a key role in the growth and development of both the Tarkwa and Damang operations, successfully executing the Damang reinvestment project, which started in 2017. Prior to joining Gold Fields, Michiel was the Executive Officer Operations at Sylvania Platinum in South Africa. This follows his time with AngloGold Ashanti (mostly in West Africa) and SamancorCr (Eastern Chrome mines in South Africa) as Metallurgical Manager.

STEPHEN OSEI-BEMPAH

General Manager, Tarkwa Mine

Strategic Leadership Programme, University of Oxford, UK; Post Graduate Diploma, Mining Engineering, University of Mines and Technology (UMaT), Ghana; BSc Mining Engineering, UMaT, Ghana; Statutory Mines Manager's Certificate, Minerals Commission, Ghana; Member, Australian Institute of Mining and Metallurgy (AusIMM).

Stephen Osei-Bempah is a Mining Engineer with over 28 years of career experience. He first joined Gold Fields in July 2003 as a Senior Project Engineer for the Tarkwa Owner Mining Project. He was transferred to Damang as Senior Mining Engineer in February 2004 and later became the Chief Mining Engineer. Stephen left Damang mine in October 2007 and re-joined Gold Fields in November 2011 as the Mining Manager for the Tarkwa mine. He was transferred to Damang mine in February 2016 as the General Manager. In January 2017, he was appointed General Manager of the Tarkwa mine. Prior to joining Gold Fields, Stephen worked as Mining Manager at Perseus Mining in Ghana and Cluff Gold in Burkina Faso. Stephen won the Mining Personality of the Year award at the 2020 Ghana Mining Industry Awards for his leadership and contribution to the industry.

Charles Kofi Nti

Acting General Manager, Damang Mine

Post Graduate Diploma in Mining Engineering, University of Mines and Technology (UMaT); B.Sc. (Hons) Mining Engineering, UMaT; Statutory Mine Manager's Certificate, Minerals Commission, Ghana.

Charles Kofi Nti is a Mining Engineer with over 28 years' experience, having worked with several gold and bauxite mining companies in Ghana, Sierra Leone and Mali. He joined Gold Fields in 2016 as Mining Manager of the Damang mine at the start of the Damang Reinvestment Project and was appointed Acting General Manager of the mine in December 2021. Prior to joining Gold Fields, Charles was the General Manager of Owere Mines Limited in Ghana. He started his career at Billiton Bogoso Gold Limited as a Mine Planning Engineer. He went on to work as a Senior Mine Planning Engineer and later, Mine Decommissioning Manager at Resolute Amansie Limited in Ghana. He spent six years with Sierra Minerals Limited at the Gondama Bauxite Mine in Sierra Leone as Technical Services Manager. Charles' other managerial roles include Contract Mining Manager for PWMIL at the Syama Gold Mine in Mali and Mining Manager of Perseus Mining (Edikan Mine) Limited in Ghana.

CASPER DZORMEKU

Asanko Joint Venture Manager and Regional Metallurgical Lead

EMBA, Ghana Institute of Management and Public Administration (GIMPA), Ghana; MSc Minerals Engineering, Camborne School of Mines, UK; BSc Chemical Engineering, Kwame Nkrumah University of Mines and Technology (KNUST), Ghana; MGhIE, Certified Mine and Process Plant Manager, Minerals Commission Ghana.

Casper Dzormeku's career as a Minerals/Process Engineer spans over 30 years, having worked in Ghana, South Korea and Saudi Arabia. Mr Dzormeku re-joined Gold Fields in March 2019 as Asanko Joint Venture Manager and Regional Metallurgical Lead. He was the Process Manager – Heap Leach for Gold Field's Tarkwa mine from December 2010 to May 2013. He has held several managerial positions, including General Manager of Ad Duwayhi Gold Mine in Saudi Arabia, Processing Engineering Manager of Hanwha Engineering and Construction Company in South Korea and Senior Manager – Metallurgy at AngloGold Ashanti Obuasi mine.

Catherine Abadji

Vice President and Head of Human Resources and Corporate Affairs

MBA, Human Resources, Ghana Institute of Management and Public Administration; BSc (Hons) Tourism, University of Cape Coast.

Catherine Abadji was appointed Vice President and Head of Human Resources and Corporate Affairs for the West Africa Region on 1 July 2022, becoming the second woman to join the Regional Executive Committee. She has over 18 years' experience in human resource management. Catherine started her career at Newmont Ghana and later worked at Clark Sustainable Resource Developments as HR Manager. She moved to L'Oréal West Africa, where she managed teams in Ghana, Cote d'Ivoire and Nigeria. Prior to joining Gold Fields, Catherine was the Human Resources Director for GBfoods Ghana.

LINDLEY WITBOOI

Vice President and Head of Finance, Gold Fields West Africa

Strategic Leadership Programme, University of Oxford, UK; Executive Leadership Programme, University of Cape Town; MBA, University of Pretoria; BCom Accounting, University of Stellenbosch; SAIPA registration, IPA Australia.

Lindley H. Witbooi has over 22 years of career experience as an accountant, mostly in the mining industry. Mr Witbooi joined Gold Fields in August 2007 as Finance Manager, before being appointed Vice President and Head of Finance for the West Africa Region in August 2013. Prior to joining Gold Fields, Mr Witbooi was the Management Information Manager: Finance at Anglo American in South Africa.

DR CELESTINA ALLOTEY

Vice President and Head of Sustainable Development, Gold Fields West Africa

PhD and MSc Geoenvironmental Engineering, University of Western Ontario, Canada; BSc (Hons) Civil Engineering, Kwame Nkrumah University of Science and Technology, Ghana; Registered Professional Engineer, Ontario, Canada (P.Eng.); Registered Professional Engineer, Ghana Institute of Engineers (Ing.); Member of the Ghana Geotechnical Society and International Geosynthetics Society.

Dr Celestina Allotey has over 20 years' experience as a Geoenvironmental Engineer, researcher and consultant. She joined Gold Fields in August 2020 as Vice President and Head of Sustainable Development. Prior to joining Gold Fields, Dr Allotey worked at Golder Associates as Senior Geoenvironmental/Tailings Engineer and later as the company's Regional Manager for West Africa. She was also the Senior Manager for Environment and Closure at AngloGold Ashanti Ghana, following her time with AMEC Earth and Environmental in Ontario, Canada as a Geoenvironmental Engineer.

Dr Allotey's over two decades career includes her extensive consultancy work in environmental management, closure planning, tailings engineering and construction, as well as acting as a third party auditor for several mining companies in Canada and Ghana.

MICHAEL EDEM AKAFIA

Vice President and Head of Legal and Compliance, GOLD FIELDS WEST AFRICA

LLM, Queen Mary University of London; Cert (International Commercial Litigation), University College London; Cert (Environmental Law), University of Pretoria; MBA (Finance), University of Ghana Business School; QCL, Ghana School of Law; LLB, University of Ghana; BA, Economics & Geography, University of Cape Coast, Ghana; Member of the Ghana Bar Association; Certified Tax Practitioner and member of the Chartered Institute of Taxation, Ghana; Investment Advisor's Representative licensed by Ghana's Securities and Exchange Commission.

Michael Edem Akafia was appointed Vice President and Head of Legal and Compliance for Gold Fields West Africa in March 2015. Since joining the company in 2010, Mr Akafia has held the position of Company Secretary of all Gold Fields entities in Ghana and previously served as the Legal Manager. He has more than 19 years’ experience as a legal practitioner, most of which has been in leadership positions, including Head of Legal and Company Secretary at SIC Financial Services Limited, Associate with Bentsi-Enchill, Letsa and Ankomah law firm, as well as Research and Legal Assistant for Lawfields Consulting. He was previously a part-time lecturer in Business Law and Jurisprudence at Zenith University College in Ghana. In February 2022, Michael was appointed as a notary public by the Chief Justice of Ghana.

JOHANNES LODEWICKES DE BEER

Vice President and Head of Engineering Projects, Gold Fields West Africa

Diploma in Senior Management, Warwick University, UK; Engineering Manager's Certificate, Ghana; Statutory Mines Manager's Certificate, Minerals Commission Ghana; Registered Professional Mechanical Engineer, South Africa; Mechanical Engineering Certificate, South Africa; National Higher Diploma in Engineering, South Africa.

With over 42 years of career experience in Mechanical Engineering, Johannes Lodewickes de Beer rose through the ranks to become the Vice President and Head of Engineering Projects for Gold Fields West Africa. He was appointed to this role in 2015 after being promoted from Head of Engineering for the West Africa Region. Mr de Beer joined Gold Fields in January 1979 as an apprentice at the Usutu Colliery mine in South Africa. He went on to become Senior Engineering Manager at Gold Fields' Beatrix and Kloof gold mines in South Africa. In 2006, Mr de Beer moved to Ghana to work with Gold Fields' Tarkwa mine as Chief Engineer and later as the Engineering Manager of the mine.

JOSHUA MORTOTI

EVP and Head of West Africa

MBA, Henley Management College, UK; MSc Mining Engineering, University of Mines and Technology; BSc (Hons) Mechanical Engineering, Kwame Nkrumah University of Science and Technology; Executive Leadership Programmes at Denver University - USA, Imperial College - UK and Wits University - South Africa; Chartered Management Accountant, CIMA CGMA; Member of Ghana Institution of Engineering

Joshua Mortoti is a Mechanical and Mining Engineer with over 25 years' experience in the mining industry. His areas of expertise include managing mine operations, engineering, strategic planning and business development. Additionally, he is knowledgeable in energy management and accounting.

He joined Gold Fields in April 2021 as Vice President – Operations for the West Africa Region and was appointed EVP and Head of the Region in August 2022 after acting in the role for seven months.

Prior to joining Gold Fields, Josh spent 15 years with Newmont, working in various senior managerial and executive roles, including General Manager of the Akyem Mine, General Manager - Operational Services, Mine Manager of the Ahafo Mine, Regional Business Planning Director, as well as Regional Capital and Energy Manager. Josh was also the Business Development Manager for AngloGold Ashanti's West Africa operations.

Josh is the President of the Ghana Chamber of Mines, having previously served as the Chairperson of the energy and technical committees of the Chamber. He also served on the technical committees of Ghana's Public Utilities Regulatory Commission, Ghana Standards Board and the Energy Commission. He was involved in developing Ghana's power regulatory framework, including leading the technical team to define guidelines for bulk customers and tariff setting.

CHARLES KOFI NTI

Acting General Manager, Damang Mine

MBA, Henley Management College, UK; MSc Mining Engineering, University of Mines and Technology; BSc (Hons) Mechanical Engineering, Kwame Nkrumah University of Science and Technology; Executive Leadership Programmes at Denver University - USA, Imperial College - UK and Wits University - South Africa; Chartered Management Accountant, CIMA CGMA; Member of Ghana Institution of Engineering

Joshua Mortoti is a Mechanical and Mining Engineer with over 25 years' experience in the mining industry. His areas of expertise include managing mine operations, engineering, strategic planning and business development. Additionally, he is knowledgeable in energy management and accounting.

He joined Gold Fields in April 2021 as Vice President – Operations for the West Africa Region and became the Acting EVP and Head of the Region on 1 January 2022.

Prior to joining Gold Fields, Josh spent 15 years with Newmont, working in various senior managerial and executive roles, including General Manager of the Akyem Mine, General Manager - Operational Services, Mine Manager of the Ahafo Mine, Regional Business Planning Director, as well as Regional Capital and Energy Manager. Josh was also the Business Development Manager for AngloGold Ashanti's West Africa operations.

Josh previously served on the technical committees of Ghana's Public Utilities Regulatory Commission, Ghana Standards Board and the Energy Commission. He was involved in developing Ghana's power regulatory framework and led the technical team to define guidelines for bulk customers and tariff setting. He was formerly the Chairperson of the Energy and Technical Committees of the Ghana Chamber of Mines.

Matt Haas

Acting Vice President - Technical Services

MSc in Mining Engineering, Montana Technology University, USA; BSc in Mining Engineering, Montana Technology University, USA

Matt Haas joined Gold Fields West Africa in February 2021 as Regional Study Manager and was appointed Acting Vice President – Technical Services in April 2022. Matt is a Mining Engineer with over 18 years' experience in open pit and underground gold mining across four continents. He began his career with Newmont in Nevada, USA, in 2004 and was later transferred to the company's operations in Ghana and the Africa Region, where he spent eight years working in various mining engineering and mine planning roles, as well as coordinating several strategic growth and expansion projects across Ghana. Following his time in Ghana, Matt worked at Goldcorp's Cerro Negro underground operations in Argentina, leading strategic planning efforts. He also spent time at Barrick's Cortez operations in Nevada, leading the Technical Services team and Ma'aden in Saudi Arabia, leading strategic planning and multiple scoping and prefeasibility level expansion studies.