OPTIMALISASI SISTEM PENYALIRAN TAMBANG TERHADAP POTENSI GENANGAN AIR PADA LANTAI PENAMBANGAN DI PT AAB JOBSITE PT GBR

ARDINANTA, DESTA NUGRAHA (2025) OPTIMALISASI SISTEM PENYALIRAN TAMBANG TERHADAP POTENSI GENANGAN AIR PADA LANTAI PENAMBANGAN DI PT AAB JOBSITE PT GBR. Skripsi thesis, UPN Veteran Yogyakarta.

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Abstract

ABSTRAK
OPTIMALISASI SISTEM PENYALIRAN TAMBANG
TERHADAP POTENSI GENANGAN AIR PADA LANTAI
PENAMBANGAN DI PT AAB JOBSITE GBR
Oleh
Desta Nugraha Ardinanta
NIM: 112210058
(Program Studi Sarjana Teknik Pertambangan)
Pengelolaan air tambang di PT Adidaya Alam Borneo (AAB) masih belum optimal
akibat tidak tersedianya estimasi debit air mine inflow yang akurat. Hal ini
menyebabkan sistem drainage dan dewatering tidak mampu mengantisipasi
genangan secara efektif. Dampaknya, aktivitas operasional tambang menjadi
terganggu dan dapat berisiko menurunkan produktivitas produksi. Oleh karena itu,
diperlukan pendekatan ilmiah untuk merancang strategi pengelolaan air tambang
yang optimal dan berkelanjutan.
Penelitian ini bertujuan mengestimasi debit air masuk ke area tambang dan
menyusun strategi optimalisasi sistem drainase dan dewatering. Estimasi limpasan
air permukaan akibat hujan dilakukan dengan menggunakan Metode Rasional
dengan mempertimbangkan distribusi hujan dan karakteristik daerah tangkapan
hujan. Debit rembesan air tanah dihitung menggunakan pendekatan Hukum Darcy
berbasis pemodelan sistem akuifer yang dibangun secara 3D. Strategi mine
drainage dilakukan dengan simulasi saluran terbuka aktual dan rekomendasi
menggunakan HEC-RAS. Strategi mine dewatering dengan mencakup analisis
kinerja pompa, kapasitas sump, elevasi optimal muka air ceruk, dan waktu optimal
pemompaan harian.
Diperoleh hasil penelitian berupa potensi maksimal debit total mine inflow sebesar
0,97 m³/s, yang terdiri dari limpasan air permukaan sebesar 0,81 m³/s dan rembesan
air tanah sebesar 0,16 m³/s. Strategi mine drainage dilakukan dengan merancang
saluran terbuka rekomendasi pada lantai penambangan dengan dimensi lebar sisi
atas sebesar 1,825 m, lebar sisi bawah 0,912 m, kedalaman 0,79 m, dan panjang sisi
miring trapesium sebesar 0,912 m yang terbukti dapat mengurangi potensi
genangan air. Hasil strategi mine dewatering menunjukkan bahwa jenis dan jumlah
unit pompa yang tersedia di lokasi sudah memadai, sehingga tidak diperlukan
penambahan atau penggantian pompa. Volume ceruk aktual juga telah mencukupi
sehingga tidak dibutuhkan modifikasi penambahan volume tambahan. Elevasi kritis
muka air ceruk ditetapkan pada 0 mdpl di kompartemen II. Diperoleh 2 skema
pemompaan harian, yaitu 18 jam per hari saat elevasi air berada di bawah 0 mdpl
dan 22 jam per hari saat elevasi air melebihi 0 mdpl.
Kata kunci: drainase tambang, mine inflow, sistem pemompaan
vii
ABSTRACT
OPTIMISATION OF MINE DRAINAGE SYSTEM FOR
POTENTIAL WATERLOGGING ON THE MINING FLOOR AT
PT AAB JOBSITE GBR
By
Desta Nugraha Ardinanta
NIM: 112210058
(Mining Engineering Undergraduated Program)
The management of mine water at PT Adidaya Alam Borneo (AAB) remains
suboptimal due to the unavailability of precise estimates of mine inflow water
discharge. This phenomenon impedes the capacity of the drainage and dewatering
systems to effectively anticipate inundation. Consequently, the operational
activities of the mine have been disrupted, which may result in a reduction of
production productivity. Consequently, a scientific approach is imperative for the
development of an optimal and sustainable mine water management strategy.
This study estimates mine inflow and optimizes drainage and dewatering systems.
Surface runoff was calculated using the Rational Method, while groundwater
seepage was estimated with Darcy’s Law and 3D aquifer modeling. Drainage
strategies were developed using HEC-RAS hydraulic simulations, and dewatering
optimization considered sump capacity, pump performance, critical water
elevation, and optimal daily pumping duration.
The findings of the study indicated a maximum potential total mine inflow discharge
of 0,97 m³/s, comprising surface water runoff of 0,81 m³/s and groundwater seepage
of 0,16 m³/s. The mine drainage strategy was executed through the implementation
of a recommended open channel configuration on the mining floor. This
configuration encompassed dimensions of 1,825 meters in upper side width, 0,912
m in lower side width, a depth of 0,79 m, and a trapezoidal sloping side length of
0,912 meters. This design has been shown to effectively mitigate the risk of
waterlogging, thereby enhancing operational safety and efficiency. The findings of
the mine dewatering strategy demonstrated that the type and quantity of pumping
units present at the site were sufficient, thereby eliminating the necessity for any
additional or replacement pumps. The niche volume was found to be adequate,
thereby eliminating the necessity for additional volume modifications. The critical
elevation of the water table was set at 0 meters above sea level in compartment II.
Two daily pumping schemes were obtained 18 hours per day when the water level
was below 0 masl and 22 hours per day when the water level exceeded 0 masl.
Keywords: mine drainage, mine inflow, pumping system
viii

Item Type:	Tugas Akhir (Skripsi)
Uncontrolled Keywords:	mine drainage, mine inflow, pumping system
Subjek:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Fakultas Teknologi Mineral dan Energi > (S1) Teknik Pertambangan
Depositing User:	Eko Yuli
Date Deposited:	15 Oct 2025 02:13
Last Modified:	15 Oct 2025 02:13
URI:	http://eprints.upnyk.ac.id/id/eprint/44396

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