Biswas, Pritam, and Phalguni Sen. “Selection of Optimum Cut-Off Grade for Surface Mining of Metalliferous Deposits: A Review”. Journal of Mines, Metals and Fuels 65, no. 2 (February 1, 2017): 66–79. Accessed May 5, 2024. http://informaticsjournals.com/index.php/jmmf/article/view/27040.