Amri, Nur, Abdul Jemain, Wan Fuad Wan Hassan, and Hasywir Syiri. “Determination of Initial Lag and Maximum Lag Distance of Semivariogram on Reserves Calculation of Gold Vein”. PROMINE 3, no. 2 (August 15, 2018). Accessed May 4, 2024. https://journal.ubb.ac.id/promine/article/view/97.