Fundamental Criteria for Methodology of Blasting Engineering in Mining Grains to Reduce Mineral Dilution in Peruvian Polymetallic Underground Mining. - Nayrim Fuentes-Rivera-Yon; Luis Arauzo-Gallardo; Carlos Raymundo; Nestor Mamani-Macedo; Javier M. Moguerza (AHFE (9), 2020)