HUBUNGAN ANTARA PHYLLIC ALTERATION DENGAN NILAI KEKUATAN BATUAN DI UNDERCUT LEVEL TAMBANG GRASBERG BLOCK CAVE (GBC) PT. FREEPORT INDONESIA

Firman Zakaria, Zulfialdi Zakaria, Ildrem Syafri, Purwa Wiguna

Abstrak


ABSTRACT

The Grasberg Block Cave (GBC) underground mine consists of multiple intrusion stages become into the Grasberg Intrusion Complex (GIC). The intrusion is consists of three intrusion stages, Dalam Intrusion Complex (DIC), Main Grasberg Intrusion (MGI) and Kali Intrusion (KI). The emplacement of intrusions occurred in a relatively short span between 3.51Ma (Dalam stage), 3.21Ma (Main Grasberg stage) and 3.1Ma (Kali stage). The existence of magmatic activity that occurs is the main control of mineral formation changes that affect the condition of rocks and quality of Cu-Au. Different type of alteration and mineralization on GIC rock can change its physical properties. Variations of mineral alterations that are formed due to the variation of intrusion causes the variation of mineral alteration that affect the value of rock strength. The value of rock strength affects the determination of rock support that will be mined in the Grasberg Block Cave underground mine (GBC). XRD analysis with mineral content dominance quartz 30.07%, sericite 22.72%, k-feldspar 13.38%, fe sulphide 9.80% and CaSulfate 5.72%. XRD analysis results are type of phyllic alteration. Point load analysis in the research area of 347 pieces of rock drill hole found rock strength value is dominated by weak (0.2 – 1 Mpa) - medium (1 – 2 Mpa). Rock Mass Rating (RMR) analysis calculation result value is RMR 20 - 60 (poor - fair).

 

Keywords: Grasberg Block Cave, phyllic alteration, XRD Analysis, Point Load Test analysis,


 

ABSTRAK

Tambang bawah tanah Grasberg Block Cave (GBC) terdiri dari beberapa tahapan intrusi yang tergabung ke dalam jenis Komplek Batuan Beku Grasberg (GIC). Tahapan intrusi dari tua ke muda adalah Dalam Intrusion Complex (DIC), Main Grasberg Intrusion (MGI) dan Kali Intrusion (KI). Adanya aktifitas magmatik yang terjadi merupakan kontrol utama pembentukan mineral ubahan yang berpengaruh terhadap kondisi batuan. Variasi mineral ubahan yang terbentuk akibat dari adanya variasi intrusi menyebabkan adanya variasi mineral ubahan yang berpengaruh terhadap Tambang bawah tanah Grasberg Block Cave (GBC) terdiri dari beberapa tahapan intrusi yang tergabung ke dalam jenis Komplek Batuan Beku Grasberg (GIC). Tahapan intrusi dari tua ke muda adalah Dalam Intrusion Complex (DIC), Main Grasberg Intrusion (MGI) dan Kali Intrusion (KI). Adanya aktifitas magmatik yang terjadi merupakan kontrol utama pembentukan mineral ubahan yang berpengaruh terhadap kondisi batuan dan kualitas cebakan Cu-Au. Variasi mineral ubahan yang terbentuk akibat dari adanya variasi intrusi menyebabkan adanya variasi mineral ubahan yang berpengaruh terhadap nilai mekanika batuan. Analisa XRD dengan dominasi kandungan mineral quartz 30.07%, sericite 22.72%, k-feldspar 13.38%, fe sulphide 9.80% dan casulfate 5.72%. Hasil analisis XRD tersebut masuk ke dalam tipe phyllic alteration. Analisis uji kuat tekan batuan (Point Load Test) pada daerah penelitian terhadap 347 buah conto batuan lubang pemboran memberikan nilai kekuatan batuan didominasi oleh nilai kekuatan batuan lemah (weak, 0.2 – 1 Mpa) - sedang (medium, 1 – 2 Mpa).

 

Kata kunci: Grasberg Block Cave, phyllic alteration, XRD Analysis, Point Load Test.


Teks Lengkap:

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Referensi


Broch E, Franklin JA.1972. The Point Load Strength Test. Int. Journal Rock Mech. Min. Sci 9, 1972, pp. 669-697.

Harrison, J. S., 1999, Hydrothermal Alteration and Fluid Evolution of the Grasberg Porfiri Cu-Au Deposit, Papua, Indonesia, unpublished M.Sc. thesis, University of Texas, Austin, 153 pages.

Jong, G. and Sunyoto, W., 2012, A Lifetime Assurance from The Grasberg Copper-Gold Mine and Future Block Caving, PTFI Communication Department, Indonesia.

Kavalieris, I., 1998, Grasberg Rock Classification, PT. Freeport Indonesia, Papua. (Unpublished).

Kingston Morrison, 1995, Important Hydrothermal Minerals and Their Significance, Sixth Edition, Geothermal and Mineral Services Divison, Kingston Morrison Limited.

Morrison, Kingston. 1995. Important Hydrothermal Minerals and Their Significance. Geothermal and Mineral Services, Kingston Morrison Ltd.

Van Bemmelen, R. W., 1949, The Geology of Indonesia, Vol. IA: General Geology of Indonesia and Adjacent Archipelagoes, Martinus Nijhoff, The Hague, The Netherlands.




DOI: https://doi.org/10.24198/bsc.v15i3.15101

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