SAFITRA, R. M.; HERIAWAN, M. N.; ANGGAYANA, K.; RUBIARTO, R.; LUBIS, I. A. Drill Hole Spacing Analysis for Evaluation of Quartz Sand Resources as Residual Material from On-Land Alluvial Tin Processing based on Global Estimation Variance and Kriging Variance, with Case Study in the Bangka and Belitung Islands, Indonesia. Journal of Engineering and Technological Sciences, [S. l.], v. 56, n. 5, p. 652–665, 2024. DOI: 10.5614/j.eng.technol.sci.2024.56.5.9. Disponível em: https://jets.itb.ac.id/jets/article/view/446. Acesso em: 16 oct. 2025.