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Efrain Raraz has extensive experience in the mining and metallurgy industry, currently serving as Jefe Senior de Planta Concentradora at Sierra Metals Inc. since May 2022. Previous roles include Superintendente de planta at Sierra Sumaq Rumi, Jefe de laboratorio metalúrgico at Sociedad Minera El Brocal, and Jefe General de Planta de Procesos Metalurgicos at Compañía Minera Raura. Efrain has held various positions focusing on process control and resource management across several mining companies, including Empresa Minera Los Quenuales - Glencore and Corporacion Minera Toma La Mano. Education includes a Master's degree in Metallurgical Engineering from Universidad Nacional del Centro del Perú and an undergraduate degree in Metallurgical Engineering from Universidad Nacional Daniel Alcides Carrion.