Estimasi Sumber Daya Uranium Tipe Batupasir di Sektor Aloban,  Sibolga, Tapanuli Tengah

Roni Cahya Ciputra; Adi Gunawan Muhammad; Tyto Baskara Adimedha; Heri Syaeful; I Gde Sukadana

doi:10.55981/eksplorium.2019.5360

Estimasi Sumber Daya Uranium Tipe Batupasir di Sektor Aloban, Sibolga, Tapanuli Tengah

Roni Cahya Ciputra, Adi Gunawan Muhammad, Tyto Baskara Adimedha, Heri Syaeful, I Gde Sukadana

DOI: http://dx.doi.org/10.55981/eksplorium.2019.5360

Abstract

ABSTRAK

Eksplorasi uranium di daerah Sibolga telah dilakukan sejak tahun 1978 oleh BATAN dan berhasil menemukan mineralisasi uranium tipe batupasir. Penelitian mengenai konsep mineralisasi uranium pada batupasir dan konglomerat di Sektor Aloban, Sibolga, telah dilakukan melalui data 22 titik bor yang menghasilkan penampang geologi, peta sebaran anomali, serta data cacahan radiometri dan geokimia. Penelitian ini bertujuan untuk mengetahui sumber daya uranium di Sektor Aloban dengan mencari hubungan antara nilai cacahan radiometri dan data geokimia pada data hasil penelitian sebelumnya menggunakan pendekatan geostatistik. Pengolahan geostatistik menggunakan perangkat lunak SGeMS menunjukkan nilai koefisien korelasi 0,5 sehingga data radiometri dan geokimia diinterpretasikan memiliki korelasi yang baik. Estimasi sumber daya uranium dihitung pada Satuan Konglomerat I dan Batupasir I yang memiliki sebaran lapisan mineralisasi tebal dan luas. Nilai kadar rata-rata uranium untuk Satuan Konglomerat I dan Satuan Batupasir I adalah 173,03 ppm U dan 161,54 ppm U secara berurutan. Estimasi sumber daya uranium di Sektor Aloban adalah 415 ton uranium sebagai sumber daya tereka.

ABSTRACT

Uranium explorations in Sibolga Area have been conducted since 1978 by BATAN and successfully result in sandstone-type uranium mineralization. Research related to uranium mineralization concept on sandstone and conglomerate at Aloban Sector, Sibolga has been conducted through 22 boreholes data which resulted in the geological section, anomaly distribution along with radiometry counting and geochemistry data. This research objective is to obtain uranium resources in Aloban Sector by correlating radiometry counting and geochemical data from previous research by using a geostatistic approach. Geostatistical processing using SGeMS software shows a correlation coefficient of 0.5 so that the radiometry and geochemical data are interpreted to have a good correlation. Uranium Resources estimation was measured on Conglomerate I and Sandstone I units which are considered to have thick and wide mineralization distribution. The average uranium grade for Conglomerate I and Sandstone I units are 173.05 ppm U and 161.54 ppm U respectively. Uranium resource estimation at Aloban Sector is 415 tons as inferred resources.

Keywords

Sibolga; Aloban; uranium; sumber daya; tereka

Full Text:

PDF (Bahasa Indonesia)

References

[1] PTBGN BATAN, “Laporan Prospeksi Pendahuluan Daerah Sibolga,” Jakarta, 1978.

[2] M. Seredkin, A. Zabolotsky, and G. Jeffress, “In Situ Recovery, an Alternative to Conventional Methods of Mining: Exploration, Resource Estimation, Environmental Issues, Project Evaluation and Economics,” Ore Geol. Rev., vol. 79, pp. 500–514, 2016.

[3] M. Masdja, S. Sastrowihardjo, and P. Tampubolon, “Uranium Mineralisation in Sibolga Formation at Aloban, North Sumatera,” Proceeding Semin. Uranium Explor. Geol. Extr., pp. 123–144, 1989.

[4] International Atomic Energy Agency, IAEA Tecdoc Series: Geological Classification of Uranium Deposits and Description of Selected Examples. Vienna: International Atomic Energy Agency, 2018.

[5] S. Thakur, B. Chudasama, and A. Porwal, “Global grade and tonnage modelling of uranium deposits,” in Quantitative and Spatial Evaluations of Undiscovered Uranium Resources, Vienna: International Atomic Energy Agency, 2018, pp. 218–262.

[6] I. G. Sukadana and H. Syaeful, “Evaluasi Sistem Pengendapan Uranium pada Batuan Sedimen Formasi Sibolga , Tapanuli Tengah,” Eksplorium, vol. 37, no. 2, pp. 125–138, 2016.

[7] J. A. Aspde, W. Kartawa, D. T. Aldiss, A. Djunuddin, D. Diatma, M. C. G. Clarke, R. Whandoyo, and H. Harahap, “Peta Geologi Lembar Padang Sidempuan dan Sibolga, Sumatera,” Bandung, 1992.

[8] E. Usman, “The Geochemical Characteristic of Major Element of Granitoid of Natuna , Singkep , Bangka and Sibolga Karakteristik Geokimia Unsur Utama Granitoid Natuna , Singkep , Bangka dan Sibolga,” Bull. Mar. Geol., vol. 30, no. 1, pp. 45–54, 2015.

[9] C. S. Hutchinson, “Tectonic evolution of Southeast Asia,” Bull. Geol. Soc. Malaysia, vol. 60, no. December, pp. 1–18, 2014.

[10] I. Setiawan, R. Takahashi, and A. Imai, “Petrochemistry of Granitoids in Sibolga and its Surrounding Areas, North Sumatra, Indonesia,” Resour. Geol., vol. 67, no. 3, pp. 254–278, 2017.

[11] E. L. Advokaat, M. L. M. Bongers, A. Rudyawan, M. K. BouDagher-Fadel, C. G. Langereis, and D. J. J. van Hinsbergen, “Early Cretaceous Origin of the Woyla Arc (Sumatra, Indonesia) on the Australian Plate,” Earth Planet. Sci. Lett., vol. 498, pp. 348–361, 2018.

[12] R. Sukhyar, A. D. Wirakusumah, D. Sukarna, N. Suwarna, Surono, E. B. Santoso, N. Buyung, and T. O. Simandjuntak, “Sedimentary Basin Map of Indonesia Based on Gravity and Geological Data,” Bandung, 2009.

[13] A. G. Muhammad, H. Syaeful, and P. Widito, “Survey Geolistrik Tahanan Jenis di Daerah Aloban dan Sekitarnya, Sibolga, Sumatera Utara,” Eksplorium, vol. 30, no. 152, pp. 45–61, 2009.

[14] S. M. Hall, M. J. Mihalasky, K. R. Tureck, J. M. Hammarstrom, and M. T. Hannon, “Genetic and Grade and Tonnage Models for Sandstone-Hosted Roll-Type Uranium Deposits, Texas Coastal Plain, USA,” Ore Geol. Rev., vol. 80, pp. 716–753, 2017.

[15] S. Jaireth, I. C. Roach, E. Bastrakov, and S. Liu, “Basin-Related Uranium Mineral Systems in Australia: A Review of Critical Features,” Ore Geol. Rev., vol. 76, pp. 360–394, 2016.

[16] N. J. Cook, R. Bluck, C. Brown, C. L. Ciobanu, and U. Domnick, “Petrography and Geochemistry of Granitoids from the Samphire Pluton, South Australia: Implications for Uranium Mineralisation in Overlying Sediments,” Lithos, vol. 300–301, pp. 1–19, 2017.

[17] O. Asghari, S. Sheikhmohammadi, M. Abedi, and G. A. Norouzi, “Multivariate Geostatistics Based on a Model of Geo-Electrical Properties for Copper Grade Estimation : a Case Study in Seridune, Iran,” Bull. di Geofis. Teor. ed Appl., vol. 57, no. March, pp. 43–58, 2016.

[18] Badan Standarisasi Nasional, Standar Nasional Indonesia 4726:2011 Pedoman Pelaporan, Sumber Daya, dan Cadangan Mineral. Jakarta, 2011.