It is the responsibility of the Board of Directors (the “Board”) of Sierra Metals Inc. (the “Company”) to oversee the management of the business and affairs of the Company. The management of the day-to-day operations of the Company is delegated to the Chief Executive Officer (“CEO”) and the other senior executives of the Company (collectively, “Management”) under the stewardship of the Board. In carrying out its duties, Board members shall: (1) provide Management with sound business guidance, calling upon the varied experiences and expertise of its members; (2) act honestly and in good faith with a view to the best interests of the Company; and (3) exercise the level of care, diligence and skill that a reasonably prudent person would exercise in comparable circumstances.

To view the Board Mandate for Sierra Metals Inc., please click here.


Oscar Cabrera, Chair of the Board

Mr. Cabrera is a Senior equity analyst with over 20 years of experience covering the metals and mining industry for bulge bracket investment banks and Canadian financial institutions, including Goldman Sachs, Merrill Lynch Canada and CIBC World Markets. He obtained recognition for industry thought leadership, fundamental commodity analysis and strong industry relationships, which has led to advisory roles for public mining companies, including Nexa Resources S.A. He also participated in the vetting of and advising on primary and secondary offerings in Canada, the U.S. and Europe. Mr. Cabrera holds a MBA from York University, a M Eng. in Structural Engineering from the University of Toronto and a B. Sc in Civil Engineering from the Instituto Tecnológico y de Estudios Superiores de Monterrey. Mr. Cabrera is a Canadian Citizen, originally from Mexico.


Miguel Aramburu, Director

Mr. Miguel Aramburu has over 25 years of professional experience with 15 years dedicated to the mining sector. He currently serves on the Board of Directors of Stracon S.A.C., a mining contractor; Fibra Prime, a Peruvian REIT; Minsur S.A., a Peru-based mining and exploration company; and IEduca, an education conglomerate. He has previously held positions on the boards of Enfoca Investments, Andino Investment Holding, El Comercio, Neptunia, Fenix Power, GyM, Stracon GyM, Maestro Peru, Castrovirreyna and Pacifico Vida. Prior to committing himself to serving on corporate boards, Mr. Aramburu held the position of CEO (2008-2010) and COO (2006-2008) of Hochschild Mining Plc. In addition, he has held progressive positions with Mauricio Hochschild Y Cia, including CEO (2004-2006), CFO (2002-2004) and General Manager for various segments of operations (1995-2002). Mr. Aramburu holds an MBA from Stanford University and obtained his Industrial Engineering degree from Pontificia Universidad Católica del Peru.


Ernesto Balarezo, CEO

Mr. Balarezo has solid management and corporate experience in leading multinational companies in the mining, cement and services industries. Today, he is an Independent Board Member in Compañía Minera Caravelí, Grupo LAR and Compañía Agrícola Chapi, as well as part of the Strategic Committees in Cobra and Spencer Stuart - Perú. He was also a Board member for AENZA (previously Graña y Montero) during its restructuring process.

During 2016 and 2017, Ernesto worked in the Presidency of the Council of Ministers, forming the Delivery Unit, which had the task of monitoring the progress of the 6 priority projects of the Government.

Before that, he held positions such as Executive Vice President for the Americas in Gold Fields Limited, and CEO of Gold Fields La Cima S.A. During this time his highlights were his contributions in the strategic definition and global results of the company and assisting in the formation of a world class team.

Previously, he worked for the Hochschild Group for 16 years. His last position was Vice President of Operations at Hochschild Mining, where he was responsible for five operations in Peru, Argentina and Mexico, as well as the mining projects in development. He also held the positions of General Manager of Hochschild Mining in Mexico and then in Peru, as well as Deputy General Manager and Finance Manager in Cementos Pacasmayo.

In addition, he has been Director of several companies related to the Hochschild Group, Gold Fields Ltd and Director - Founder of the Peruvian - South African Chamber. He has also made contributions as Director of Peru 2021 and in IPAE Acción Empresarial.

He has a master's degree in Industrial Management (MS) and a Bachelor in Industrial Engineering (BS), both degrees obtained at the University Texas A&M in USA. He has followed various courses of specialization in direction, management, finance, and human resources in institutions like Institute of Directors, Harvard, Wharton, INSEAD, IESE, among others.


Douglas Cater, Director

Douglas Cater P. Geo, FGC, is a professional geologist with more than 35 years of experience in the gold mining and exploration business gained while working with senior-tier Canadian-based mining and exploration companies. From January 2016 to January 2019, Mr. Cater served as Vice President Exploration (Canada) for Kirkland Lake Gold Ltd., a Toronto based company with operating mines and exploration projects located in northeastern Ontario and Australia. Mr. Cater has worked at numerous world class gold deposits, where he has guided exploration teams for success. In early 2019, D. F Cater Consulting Geologist Ltd, was incorporated, as a Consulting Company which conducts property evaluations, technical reports and project management services to Mining and Mineral exploration companies. Doug is currently a Director of Sierra Metals Inc, Harte Gold Corporation, Mayfair Gold Corporation and a Technical Advisor to Prosper Gold Corporation and Zodiac Gold Corp. Douglas is enrolled in the Directors Education Program offered by the Institute of Corporate Directors.


Robert Neal, Director

Mr. Neal has 33 years experience in senior roles with hedge funds and leading global corporate finance firms. He has extensive experience as both a principal investor and advisor in leveraged finance, high yield, private and public equity. He has long-standing relationships and expertise in the energy, industrial and materials sectors. Mr. Neal founded Skellig Capital LLC in February 2007. Skellig Capital is a global long/short equity hedge fund based in New York. Primary industry concentrations include industrials, energy, mining, metals and logistics. Prior to founding Skellig Capital, Mr. Neal was responsible for industrial sector research with a concentration on ferrous and industrial metals at Passport Capital, LLC. Prior to joining Passport Capital, Mr. Neal had a 14 year corporate finance career with firms including Merrill Lynch, Barclays de Zoete Wedd and Dresdner Kleinwort Wasserstein, where Mr. Neal was the global head of private equity coverage. Mr. Neal’s corporate finance expertise concentrated on leveraged finance, high yield, restructuring and mergers & acquisitions. In his corporate finance work Mr. Neal focused for many years on the private equity community in the United States and Western Europe, providing acquisition and financial structuring advice for numerous transactions, principally in the industrial sector. Mr. Neal received a BA from Duke University in 1988


Carlos Santa Cruz, Director

Mr. Santa Cruz is a Mining Engineer with over 40 years of experience of strong international managerial background in mining operations at a senior level. He held positions with major mining companies, including Senior Vice-President of Australian and New Zealand Operations and Senior Vice-President of South American Operations for Newmont. He currently sits as Chairman of the Board for BISA Ingenieria de Proyectos S.A.. and Director for JRC Ingeniería y Construcción S.A.C. Mr. Santa Cruz is an Independent Mining Consultant and Part-time Professor at Pontificia Universidad Católica and is a member of Industry Advisory Committees at Penn State and Piura University. Chairman of the Board for CIMADE, NGO oriented to promote sustainable mining and infrastructure megaprojects. Mr. Santa Cruz holds a Ph.D., Mining Engineering and M Eng., Industrial Engineering from Penn State University, as well as the Advanced Management Program from Harvard University. Mr. Santa Cruz is a Peruvian Citizen.


Koko Yamamoto, Director

Ms. Yamamoto is a chartered professional accountant with over 19 years' experience. She is a partner at McGovern, Hurley LLP, a CPAB registered firm, since 2003, and her practice includes a focus on assurance engagements for reporting issuers in the resource sector. Ms. Yamamoto is involved in initial public offerings and private placements, mergers and acquisitions. She is currently a director for Largo Resources Inc. as well as Chair of the Largo Resources Audit Committee. Ms. Yamamoto is registered as a panel auditor with the Investment Industry Regulatory Organization of Canada (IIROC), which enables her to conduct audits of investment dealers. Ms. Yamamoto obtained her CPA CA designation in 2001 and holds a Bachelor of Commerce from the University of British Columbia.