ESTIMASI SUMBER DAYA BAUKSIT MENGGUNAKAN METODE ORDINARY KRIGING DI KECAMATAN MELIAU, KALIMANTAN BARAT

ESTIMATION OF BAUXITE RESOURCES BASED ON ORDINARY KRIGING METHODS AT KECAMATAN MELIAU, WEST KALIMANTAN

Authors

  • Westia Alifah Surya Pratiwi Politeknik Energi dan Pertambangan Bandung Author
  • Denny Lumban Raja Politeknik Energi dan Pertambangan Bandung Author
  • Priatna Politeknik Energi dan Pertambangan Bandung Author
  • Sarah Mutia Pusat Sumber Daya Mineral, Batubara, dan Panas Bumi Author
  • Dedi Sunjaya Unit Geomin, PT. Aneka Tambang Author

DOI:

https://doi.org/10.47599/bsdg.v19i2.492

Abstract

The estimation of mineral resources is crucial in mining, particularly in determining production targets, pit design, and investment decisions. Accurate resource estimation results will facilitate optimal mine planning. The objective of this study is the application of estimation techniques that consider geostatistics, namely ordinary kriging, in estimating bauxite deposit resources. The research location is in the laterite arc of West Kalimantan. The data used for estimation are exploration data from 212 test pit locations. The aim of this study is to identify the lithology of the bauxite deposit, distribution of grades, and estimate bauxite resources as well as determine the optimal spacing of test pits as a basis for resource classification in the study area. Petrographic analysis was conducted on four samples to determine the lithology. The study results indicate that the lithology forming the bauxite deposit consists of granodiorite, quartz diorite, and granite. The bauxite deposits in the study area are predominantly derived from granodiorite with high  content, thus characterizing the bauxite as kaolinitic bauxite. The bauxite resource estimation results, based on a cut-off grade of  >35%,  <8%, dan  ≤30%, amounted to 722,720 tons of washed bauxite, with an average grade of 39,78% ,  dan  25,05% , with a concretion factor of 48.44%. The inferred washed bauxite resources are 146,962 tons, the indicated resources are 550,482 tons, and the measured resources are 221,643 tons. Based on the sill variogram calculation, the optimal spacing for test pits for bauxite exploration in the study area with resource classification is 100 m for inferred, 50 m for indicated, and 25 m for measured resources.

References

Aleva, G. J. (1994). Laterites, Concept, Geology, Morphology, and Chemistry. ISRIC, Wageningen.

Armstrong, M. (1998). Basic linear geostatistics. Springer Science & Business Media.

Balfas, M, D., Anjarwati, R., Sasmito, K., Zaenal, M., Muthadin., Oviandari, Y, G. (2021). Estimasi Sumber Daya Batubara Seam 1 Menggunakan Metode Circular 891 USGS Daerah Tanah Merah, Kota Samarinda Provinsi Kalimantan Timur. Jurnal Geocelebes Vol. 5 No. 1, April 2021, 63-71.

Byrne, B. M. (2010). Structural equation modeling with AMOS: Basic concepts, applications, and programming. New York: Routledge.

Coombes, J. (2008). The art and science of resource estimation: a practical guide for geologists and engineers. Coombes Capability.

George, D. & Mallery, M. (2010). SPSS for Windows Step by Step: A Simple Guide and Reference, 17.0 update (10a ed.). Boston: Pearson.

Hall, Robert & Morley, Christopher. (2004). Sundaland Basins. AGU Geophysical Monograph. 149. 55-85. 10.1029/149GM04.

Hennig, J., dkk. (2017). The Mesozoic tectonic-magmatic evolution at the Paleo-Pacific subduction zone in West Borneo. Gondwana Research, 292-310.

Journel, A.G. and Huijbregts, C.J. (1978). Mining Geostatistics. Academic Press, London.

Krige, D.G. (1997). A Practical Analysis of the Effects of Spatial Structure and of Data Available and Accessed, on Conditional Biases in Ordinary Kriging.

Matheron, G. (1963). Principle of Geostatistics. Economic Geology, 58 (8): 1246–1266.

Sanyoto, dkk. (1993). Geology of the Pontianak/Nangataman Sheet Area, Kalimantan. Map at 1:250,000 scale. Bandung, Indonesia: Geological Research and Development Centre.

Sinclair, A. J., & Blackwell, G. H. (2006). Applied mineral inventory estimation. Cambridge University Press.

Schellmann, W. (1986). A new definition of laterite; In: Lateritization Processes. (ed.) Banerjee P K, Geol. Surv. India Memoir 120 1–7.

Sunjaya, D. (2022). Studi Petrogenesis Bauksit Dan Mineralisasi Skandium Daerah Tayan, Kalimantan Barat. Tesis Magister, Institut Teknologi Bandung.

SNI 4726-2019. (2019). Pedoman Pelaporan, Sumber daya, dan Cadangan Mineral. Jakarta: Badan Standarisasi Nasional.

Snowden, D.V. (1996). Practical Interpretation of Resource Classification Guidelines. Perth: AusIMM

Valeton, I. (1972). Bauxite. London: Elsevier Publishing Company.

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Published

2024-08-23

Issue

Vol. 19 No. 2 (2024): Buletin Sumber Daya Geologi

Section

Buletin Sumber Daya Geologi

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