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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. J. Eng. Technol. Sci. 2024, 56 (5), 652-665. https://doi.org/10.5614/j.eng.technol.sci.2024.56.5.9.