Authors: Maswahenu, M; Pujiastuti, SK; Pardede, G

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DOI https://doi.org/10.36487/ACG_repo/2152_117

Cite As:
Maswahenu, M, Pujiastuti, SK & Pardede, G 2021, 'Practice of 2:1 waste rock dump reclamation slope at Batu Hijau – a 20 year journey creating the best legacy', in AB Fourie, M Tibbett & A Sharkuu (eds), Mine Closure 2021: Proceedings of the 14th International Conference on Mine Closure, QMC Group, Ulaanbaatar, https://doi.org/10.36487/ACG_repo/2152_117

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Abstract:
The Batu Hijau’s orebody is a world-class copper-gold porphyry owned by PT Amman Mineral Nusa Tenggara located in previously uninhabited forestland with sloping terrain southwest of Sumbawa Island. The climatic condition is influenced by two distinct monsoon periods, namely the east monsoon which is characterized by low rainfall and humidity level and extends from May through September, and the west monsoon, which extends from November through March each year. Annual precipitation is 2,511 mm with over 75 percent of rainfall occurring during the west monsoon. The construction phase started in 1997 and it took 3 years before production started in March 2000. Reclamation is performed concurrently and integrated into the annual mine plan update. Numerous studies had been performed since the early stages of exploration that including tree species selection, PROSPER forest vegetation/ soil hydrology model to determine soil thickness, soil water holding capacity, and construction of 2:1 new test slope (NEWTS). This paper outlines the development of a 2: 1 reclamation slope in the waste dump that has been carried out over 20 years from land preparation, erosion control techniques, tree transplanting, monitoring, and evaluation. This achievement assures that Batu Hijau reclamation program’s goal to restore the ex-mining area to a forest similar to its pre-mining condition is achievable.

References:
PT Amman Mineral Nusa Tenggara 2021, Environmental Management and Monitoring Implementation Report Second Semester, July- December 2020.
Golder Associates Inc 1999, Waste Dump Management Plan Batu Hjau Project Volume 6 Tech Memo 6.1 thru Tech Memo 6.4. Unpublished consultant report submitted to PT Newmont Nusa Tenggara.
Golder Associates Ltd. And PPES Works (SARAWAK) Sdn Bhd 2004, Report on Geotechnical and Bioengineering Studies New 2:1 Test Slopes for Waste Dumps Batu Hijau Mine Sumbawa, Indonesia. Unpublished consultant’s report submitted to PT Newmont Nusa Tenggara
Golder Associates Ltd. And PPES Works Sdn Bhd 2005, Report on Addendum to Geotechnical and Bioengineering Studies New 2:1 Test Slopes for Waste Dumps Batu Hijau Mine Sumbawa, Indonesia. Unpublished consultant’s report submitted to PT Newmont Nusa Tenggara
Golder Associates 2013, Geotechnical Review Waste Dump Reclamation Slopes, Batu Hijau Mine, Sumbawa Indonesia. Unpublished consultant’s report submitted to PT Newmont Nusa Tenggara
Juncosa, A and Hanes, T 2014, Batu Hijau Reclamation review. An unpublished consultant report prepared by Ecosynthesis Scientific & Regulatory Services, Inc and Hydro Science and submitted to PT Newmont Nusa Tenggara
Pusat Studi Reklamasi Tambang IPB 2017, Pemantauan Lingkungan Komponen Iklim Mikro di Areal Reklamasi Batu Hijau PT Amman Mineral Nusa Tenggara, Nusa Tenggara Barat. Unpublished consultant report submitted to PT Amman Mineral Nusa Tenggara.
Pusat Studi Reklamasi Tambang IPB 2017, Pemantauan Lingkungan Komponen Flora di Areal Reklamasi Batu Hijau PT Amman Mineral Nusa Tenggara, Nusa Tenggara Barat. Unpublished consultant report submitted to PT Amman Mineral Nusa Tenggara.




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