MINERÍA la mejor puerta de acceso al sector minero EDICIÓN 578 / NOVIEMBRE 2025 70 Operaciones Mineras y Gestión de Activos Abstract Underground mining in central Peru, particularly in the area now operated by Minera Chinalco, dates back to the late 19th and early 20th centuries, when companies such as the Cerro de Pasco Copper Corporation began extracting polymetallic veins (lead, zinc, silver, and copper). However, prior to the arrival of foreign companies, smaller-scale mining was already present during the colonial and even pre-Hispanic periods. This technical study was carried out at Chinalco Peru’s Toromocho open-pit operation, located at more than 4,500 masl in the Junín region. The deposit had previously been mined underground (approximately 100-120 years ago) and is now exploited using open-pit methods. As a result of the transition from underground to open-pit extraction, there is a significant presence of old workings (drifts, shafts, NUEVA METODOLOGÍA PARA PRESERVAR INFRAESTRUCTURAS ANTIGUAS (100 AÑOS) EN PROCESOS DE MINADO A TAJO ABIERTO “CASO DE ÉXITO”
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