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Ivan Alejandro Castillo Gonzalez is a professional with extensive experience in cost accounting and financial administration across various industries. Currently serving as a Contable de costes at Sierra Metals Inc. since February 2024, Ivan's responsibilities include cost reporting, budget management, and quarterly forecasting. Previously, Ivan held similar roles at Orla Mining Ltd., where contributions included asset support and general accounting, and Endeavour Silver Corp. as Jefe de administración / Contralor, overseeing the financial administration of the unit. Additional roles include General Accountant at ROCS CONSTRUCCIONES SA DE CV, Head of Administration at SGS QUALITEST DE MEXICO SA DE CV, and various positions requiring comprehensive accounting tasks at Caminos Obras y Puentes SA de CV and Megacable. Ivan Alejandro Castillo Gonzalez holds a Management degree from Harvard University and certifications in IFRS from Tecnológico de Monterrey, along with a degree in Accounting and Finance from Universidad Juárez del Estado de Durango.