Hydrothermal Alteration and Mineralization of the Randu Kuning Porphyry Cu-Au and Intermediate Sulphidation Epithermal Au-Base Metals Deposits in Selogiri, Central Java, Indonesia
Sutarto Sutarto(1*), Arifudin Idrus(2), Agung Harijoko(3), Lucas Donny Setijadji(4), Franz Michael Meyer(5), Sven Sindern(6), Sapto Putranto(7)
(1) Universitas Pembangunan Nasional "Veteran", Yogyakarta
(2) Universitas Gadjah Mada
(3) Universitas Gadjah Mada
(4) Universitas Gadjah Mada
(5) RWTH Aachen University, Germany
(6) RWTH Aachen University, Germany
(7) PT. Alexis Perdana Mineral
(*) Corresponding Author
Abstract
The Randu Kuning Porphyry Cu-Au prospect area is situated in the Selogiri district, Wonogiri regency, Central Java, Indonesia, about 40 km to the South-East from Solo city, or approximately 70 km east of Yogyakarta city. The Randu Kuning area and its vicinity is a part of the East Java Southern Mountain Zone, mostly occupied by both plutonic and volcanic igneous rocks, volcaniclastic, silisiclastic and carbonate rocks. Magmatism-volcanism products were indicated by the abundant of igneous and volcaniclastic rocks of Mandalika and Semilir Formation. The Alteration zones distribution are generally controlled by the NE–SW and NW–SE trending structures. At least eight types of hydrothermal alteration at the Randu Kuning area and its vicinity had been identified, i.e. magnetite + biotite ± K-feldspar ± chlorite (potassic), chlorite + sericite + magnetite ± actinolite, chlorite + magnetite ± actinolite ± carbonate (inner propylitic), chlorite + epidote ± carbonate (outer propylitic), sericite + quartz + pyrite (phyllic), illite + kaolinite ± smectite (intermediate argillic), illite + kaolinite ± pyrophyllite ± alunite (advanced argillic) and quatz + chlorite (sillisic) zones. The Randu Kuning mineralization at Selogiri is co existing with the porphyry Cu-Au and intermediate sulphidation epithermal Au-base metals. Mineralization in the porphyry environment is mostly associated with the present of quartz-sulphides veins including AB, C, carbonate-sulphides veins (D vein) as well as disseminated sulphides. While in the epithermal prospect, mineralization is particularly associated with pyrite + sphalerite + chalcopyrite + carbonate ± galena veins as well as hydrothermal breccias. The Randu Kuning porphyry prospect has copper gold grade in range at about 0.66–5.7 gr/t Au and 0.04–1.24 % Cu, whereas in the intermediate sulphidation epithermal contain around 0.1–20.8 gr/t Au, 1.2–28.1 gr/t Ag, 0.05–0.9 % Zn, 0.14–0.59 % Pb and 0.01–0.65 % Cu.
Keywords
Full Text:
PDFReferences
Arif, J., and Baker, T. (2004) Gold Paragenesis and Chemistry at Batu Hijau, Indonnesia: Implications for Gold-Rich Porphyry Copper Deposits, Mineralium Deposita 39: 523-335. Carlile, J.C. dan Mitchell, A.H.G. (1994) Magmatic Arcs and Associated Gold and Copper Mineralisation in Indonesia, Journal of Geochemical Exploration 50: 92-142. Corbett, G. (2011) Comments on The Exploration Potential of The Wonogiri Porphyry Cu-Au Project, Central Java, Indonesia, Corbett Geological Services Pty. Ltd., Unpublished, 27 p. Corbett, G. (2012) Further Comments on The Wonogiri Porphyry Cu-Au Project Central Java, Indonesia, Corbett Geological Services Pty. Ltd., Unpublished, 37 p. Hamilton,W.B. (1979) Tectonics of the Indonesian Region. Professional Paper 1078,U.S. Geolology Survey, Washington, DC.,345 p. Hellman, P.L. (2010) Tujuh Bukit Project Report on Mineral Resources, Located in East Java, Indonesia. Technical Report for Interprid Mines Limited. URL: http://media.wotnews.com.au/esxann/01120- 850.pdf. Imai, A., Shinomiya, J., Soe, M.T., Setijadji, L.D., Watanabe, K., and Warmada, IW. (2007) Porphyry-Type Mineralization at Selogiri Area, Wonogiri Regency, Central Java, Indonesia, Resources Geology 57: 230-240. Isnawan, D., Sukandarrumidi and Sudarno, I. (2002) Kontrol Struktur Geologi Terhadap Jebakan Tembaga Sebagai Arahan Eksploitasi di Daerah Ngerjo dan Sekitarnya Kecamatan Tirtomoyo, Kabupaten Wonogiri Propinsi Jawa Tengah, Gama Sains IV (2) Juli 2002, p. 149-157. Katili, J. A. (1989) Evolution of the Southeast Asian arc complex, Geologi Indonesia 12: 113-143. Maryono, A. (2008) Porphyry Veining Types and Characteristics, Porphyry Deposit Workshop, Batu Hijau December 1-5-2008. Maryono, A., Setijadji, L.D., Arif, J., Harrison, R., Soeria-Atmadja, E. (2012) Gold, Silver and Copper Metallogeny of the Eastern Sunda Magmatic Arc Indonesia, Proceeding of Banda and Eastern Sunda Arcs 2012 MGEI Annual Convention, 26- 27 November 2012, Malang, East Java, Indonesia, p. 23-38. Milési, J.P., Marcoux, E., Sitorus, T., Simanjuntak, M., Leroy, J., and Bailly, L. (1999) Pongkor (West Java, Indonesia): A Pliocene SupergeneEnriched Epithermal Au-Ag-(Mn) Deposit, Mineralium Deposita (1999) 34: 131-149. Muthi, A., Basten, I.G., Suasta, I.G.M., and Litaay, N.E.W. (2012) Characteristic of Alteration and Mineralization at Randu Kuning-Wonogiri Project, Proceeding of Banda and Eastern Sunda Arcs 2012 MGEI Annual Convention, 26-27 November 2012, Malang, East Java, Indonesia, p. 117-132. Nightingale, P.L. (2014) Report on Activities for the Quarter Ended 30 September 2014, Augur Resources Ltd. 11 p. Prihatmoko, S., Digsowilogo, S., and Kusumanto, D. (2002) Potensi Cebakan Mineral di Propinsi Jawa Tengah dan Daerah Istimewa Yogyakarta, in: Sumberdaya Geologi Daerah Istimewa Yogyakarta dan Jawa Tengah, Ikatan Ahli Geologi Indonesia Pengurus Daerah DIY-Jateng, p. 87- 103. Setijadji, L.D., Kajino, S., Imai, A., and Watanabe, K. (2006) Cenozoic Island Arc Magmatism in Java Island (Sunda Arc, Indonesia): Clues on Relationships between Geodynamics of Volcanic Centers and Ore Mineralization, Resource Geology 56: 267-292. Setijadji, L.D. and Maryono, A. (2012) Geology and Arc Magmatism of the Eastern Sunda Arc, Indonesia, Proceeding of Banda and Eastern Sunda Arcs 2012 MGEI Annual Convention, 26- 27 November 2012, Malang, East Java, Indonesia, p.1-22. Setiawan, B. dan Yudawinata, K. (2000) Review of Mineral Exploration Along the Sunda-Banda Magmatic Arc, Freeport-ITB Geological Symposium, 13 p. Suasta, IG.M. and Sinugroho, I.A. (2011) Occurrence of Zoned Epithermal to Porphyry Type Cu-Au Mineralization at Wonogiri, Central Java, Proceeding of The 36th HAGI and 40th IAGI Annual Convention. Soeria-Atmadja, R., Maury, R.C., Bellon, H., Pringgoprawiro, H., Polvé, M., and Priadi, B. (1991) The Teriary Magmatic Belt in Java. The Proceeding of the Silver Jubbiles Symposium On the Dynamics of Subduction and Its Products,Yogyakarta: p. 98-121. Soeria-Atmadja, R. Maury, R.C., Bellon, H., Pringgoprawiro, H., Polvé, M., and Priadi, B. (1994) Tertiary Magmatic Belt in Java. Journal of Southeast Asian Earth Science 9: 13-27. Sutarto, Idrus, A., Harijoko, A., Setijadji, L.D., Meyer, F.M, and Danny, R. (2015) Characteris- © 2016 Department of Geological Engineering, Gadjah Mada University 17SUTARTO et al. tic of The Fluid Inclusions in Quartz Veins at The The Randu Kuning Porphyry Cu-Au Deposit, Selogiri, Central Java. Prosiding Seminar Nasional Kebumian X-2015 Fakultas Teknologi Mineral UPN “Veteran” Yogyakarta 18-19 Novemper 2015, ISBN No. 978-602-8206-67-9. pp. 208-220 Sutarto, Idrus, A., Harijoko, A., Setijadji, L.D. and Meyer, F.M. (2015) Veins and Hydrothermal Breccias of The Randu Kuning Porphyry Cu-Au and Epithermal Au Deposits at Selogiri Area, Central Java, Indonesia. Journal of SE Asian Applied Geology 7: 80-99. Tain, Z., Sutrisno, Pohan, M.P., and Herudiyanto (2005) Penilaian Sumberdaya Tembaga-Emas Porfiri Daerah Pulau Sumatra dan Pulau Jawa, Hasil Kegiatan Subdit Konservasi TA. 2005. URL: http://psdg.bgl.esdm.go.id/kolokium%202005/ konservasi/6-Penilaian.pdf. Van Bemmellen, R.W. (1949) The Geology of Indonesia, and Adjacent Archipelagoes, Vol. IA, Gov. Print. Office, Martinus Nijhoff, the Hague. Van Leeuwen, T.M. (1994) 25 Years of Mineral Exploration and Discovery in Indonesia, Jornal of Geochemical Exploration, Elsevier Science, Amsterdam, 50: 13-89.
DOI: https://doi.org/10.22146/jag.26951
Article Metrics
Abstract views : 9074 | views : 1980Refbacks
- There are currently no refbacks.
Copyright (c) 2016 Sutarto Sutarto, Arifudin Idrus, Agung Harijoko, Lucas Donny Setijadji, Franz Michael Meyer, Sven Sindern, Sapto Putranto
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Journal of Applied Geology Indexed by:
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.