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Sierra Metals Mexico
Sierra Metals Peru

Management

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Daniel Tellechea, B.Sc., MBA, President and CEO

Mr. Tellechea received a BSc in accounting in 1968 and a Master's Degree in Business Administration in 1983, both from the Tecnologico de Monterrey (Mexico). Until recently, Mr. Daniel Tellechea was an independent financial and management consultant. From 2003 to 2005, he was President and CEO of Asarco LLC. Previous to that, from 1994 to 2003, Mr. Tellechea served as the Managing Director of Finance and Administration of Grupo Mexico, Asarco's parent corporation. For the period between 1999 and 2003, he also served as Asarco's Chief Financial Officer and as Vice-President of Finance for Southern Peru Copper Corporation, which was majority owned by Grupo Mexico.

Fernando Piccini, Chief Financial Officer

Mr. Fernando Piccini served as Chief Financial Officer and Head of Corporate Development of Volcan Compañía Minera S.A.A. in Peru from 2008 to 2011. Previous to that he held various finance and treasury positions with Goldman Sachs & Co. in New York, General Motors Corporation in New York, Quimiza Ltda. in Bolivia and Quimica Suiza S.A. in Peru. Mr. Piccini holds a Bachelor of Science in Business Administration (1997) from the Universidad de Lima and a Masters in Business Administration (2005) from the University of Virginia.

Carlos Villanueva, General Manager, Sociedad Minera Corona

Since 1984, Mr. Villanueva has served as General Manager of Sociedad Minera Corona S.A., owner of the Yauricocha mine. From 1974 to 1984 he served as superintendent of Compania Minera Santa Rita, previous to that he was mine superintendent of Minas Canarias from 1970 to 1973, and he began his career in 1969 as mine manager at Cobre in Peru. Mr. Villanueva received a geological mine engineering degree from the Universidad Nacional de Ingenieria de Peru in 1968.

Sergio Ramírez, General Manager, Dia Bras Mexicana

Mr. Ramirez, Metallurgist and Mining Engineer, graduated from the School of Mines at the University of Guanajuato, Mexico in 1968 and worked with Grupo Mexico from 1968-2002 achieving the position of Director of Mining Operations and Exploration (1989-2002). From 2002-2006 he was the Director of State Programs within the Ministry of Economy, for the Federal Government of Mexico. Most recently, Mr. Ramirez was Director of Mining Operations for First Majestic Silver Corp. (2007-2012).

Herbert Fiedler, Chief Commercial Officer

Mr. Fiedler has served as Commercial Manager of the Gubbins Group’s mines Sociedad Minera Corona, Compañía Minera Santa Rita, Sociedad Minera Carolina, Minera Yauli and Yauricocha mine from 1991 to 2011. From 1985 to 1989 he was partner and Commercial Manager of R.G.T. Minerales, one of the first Peruvian traders and commercial representative of Milpo in Peru. He has also held, since 1978, strategic positions in mining and trading companies such as Hochschild Mining, Gerald Metals Inc., Samin Corp. and Sudamin. Mr. Fiedler studied Business Administration in the Universidad de Lima (1978). He also has postgraduate education in Commerce, Negotiation, Finance and Stock Market.

Thomas Robyn, Ph. D., Senior Vice President, Exploration

Dr. Robyn earned his Ph.D., Geology in 1977 from the University of Oregon with a major in Igneous Petrology/Volcanology. He began his career with Anaconda Minerals Company and by 1982 was appointed Anaconda's regional exploration manager in Norway. He has also held top-level positions with several junior companies, and in recent years has advised investment funds with respect to mineral companies. Dr. Robyn's career has been truly international, having overseen projects in such countries as Australia, Ecuador, Greenland, Norway, Liberia, Equatorial Guinea, Guyana and Suriname, as well as several US states. Dr. Robyn joined the Board of Dia Bras Exploration in September 2005. He is also director of Yorbeau Resources Inc.