Parra Paola O., Marcos Quispe P., Freddy Lobaton Z., Adali Vela F., and Will Yucra C. “Trends in Underground Mining”. International Journal of Engineering and Management Research 11, no. 4 (August 31, 2021): 242–247. Accessed July 22, 2024. https://ijemr.vandanapublications.com/index.php/ijemr/article/view/47.