The Approach of Anisotropic Semivariogram using Ordinary Kriging (OK) Method for The Distribution Pattern of Tin Mineral Associations. PROMINE [Internet]. 2020 Jul. 13 [cited 2026 Aug. 21];8(1):34-9. Available from: https://www.journal.ubb.ac.id/index.php/promine/article/view/1828