Disposal Transition and Drainage Design at Pit 2AA SLS Site: A Case Study at PT Sentosa Laju Sejahtera, Loa Janan

Arda Bara Ariadi; Fanteri Aji Dharma Suparno; Januar Fery Irawan; Siti Aminah; Haeruddin; Utari Retno Sulistyo Rini; Kurnia Dewi Mulyani; Emanuel Grace Manek

Authors

Arda Bara Ariadi Mining Engineering Study Program, Engineering Faculty, University of Jember, Jember, Indonesia
Fanteri Aji Dharma Suparno Mining Engineering Study Program, Engineering Faculty, University of Jember, Jember, Indonesia
Januar Fery Irawan Mining Engineering Study Program, Engineering Faculty, University of Jember, Jember, Indonesia
Siti Aminah Mining Engineering Study Program, Engineering Faculty, University of Jember, Jember, Indonesia
Haeruddin Mining Engineering Study Program, Engineering Faculty, University of Jember, Jember, Indonesia
Utari Retno Sulistyo Rini Mining Engineering Study Program, Engineering Faculty, University of Jember, Jember, Indonesia
Kurnia Dewi Mulyani Mining Engineering Study Program, Engineering Faculty, University of Jember, Jember, Indonesia
Emanuel Grace Manek Mining Engineering Study Program, Engineering Faculty, University of Jember, Jember, Indonesia

Keywords:

Waste Disposal Site, Acid Mine Drainage, Factor of Safety (FS)

Abstract

This research discusses the design of the disposal area transition and drainage system in Pit 2AA of PT Sentosa Laju Sejahtera to overcome the limited space of the stockpile due to the use of the backfilling method. The main issues include effective drainage design, selection of alternative disposal sites, and embankment slope stability analysis. The planned rainfall was calculated using the Gumbel distribution with rainfall data for the last 10 years (2014-2023), while the runoff water discharge was calculated using the Rational method, resulting in a discharge of 7.8 m³/second. The open channel was designed with two trenches, Trenches A and B, with capacities of 9.59 m³/sec and 7.92 m³/sec, respectively. The disposal design was placed outside the Life of Mine boundary, using the gradual finger disposal method with three levels from elevation 93 to 105 meters. The slope geometry consists of a tier height of 4 meters, a tier width of 15 meters, a single slope angle of 30°, and an overall slope of 13°. The total disposal capacity reached 441,310 BCM. Slope stability analysis was conducted using the Janbu Simplified method, showing that the factor of safety (FK) value is in the range of 1.308-2.404, meeting the minimum FK ≥ 1.3 according to the Decree of the Minister of Energy and Mineral Resources No. 1827 K/30/MEM/2018. The results show that the drainage and disposal designs are technically feasible and support the sustainability of mine operations.

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