The Acid-Base Accounting (ABA) of Overburden Rock to Predict Acid Mine Water in Kasai Coal Mining, Indonesia

Abstract

The Acid-Base Accounting (ABA) and TCLP methods from overburden samples collected from the coal mine in Kasai were undertaken to predict pre-mining acid mine water quality. Maximum potential acidity (MPA), acid neutralization capacity (ANC), net acid generation (NAG), net acid producing potential (NAPP) and ANC/MPA ratios were determined on the Acid-Base Accounting (ABA) protocol. Most of the samples from KS-10, KS-11 and KS-12 show the pH of NAG of overburden ranges from 5.53–7.86 negatively net acid neutralization potential (NAPP). The ANC/MPA ratio varied from 1.09–26.60 and is classified as non-acid-forming except at an interval depth of 7.00–9.00 m in KS-12, where it is classified as uncertainty. The potentially acid mine water detected in KS-39 at an interval depth of 16.00–36.00 m was classified as potential acid forming (PAF), indicated by a positive NAPP, a low ratio of ANC/MPA (below 1.0) and high dissolved metal iron.

Scoping Review: Implementasi Water Accounting Di Indonesia

“…Hamdani melakukan dua penelitian pada sektor pertambangan, yaitu pada Creative Commons Attribution 4.0 International License tahun 2017 dan 2019. Penelitian Hamdani et al (2017) dilakukan dengan tujuan untuk mengetahui karakteristik batuan penutup di tambang batubara Horna, Papua Barat. Sampel batuan diambil dari 4 lokasi berbeda dan diuji di laboratorium menggunakan beberapa tes untuk mengklasifikasikan potensi pembentukan asam dalam batuan.…”

“…Tes Acid-Base Accounting mengindikasikan bahwa batuan penutup di lokasi penelitian memiliki potensi lingkungan yang asam. Sementara Hamdani et al (2019) mengambil objek penelitian di Kasai, Kalimantan Timur. Berdasarkan hasil uji Acid -Base Accounting (ABA) dan Toxic Characteristic Leaching Procedures (TCLP), batuan penutup di sumur bor KS-10, KS-11 dan KS-12 secara umum tidak berpotensi membentuk air tambang asam (NAF, Tipe 1) dan aman selama proses penambangan dan pengangkatan batuan penutup.…”

Mineralogical and Geochemical Characteristics of the H-Pit of the Chatree Gold Deposit, Central Thailand: A Case Study for Assessment of Acid Rock Drainage and Heavy Metal Sources

“…These pollutions have potential long-term damage to the local environment and livelihood. In most cases, the pollution is principally caused by acid rock drainage (ARD) and/or acid mine drainage (AMD) [1][2][3][4][5]. ARD naturally occurs in altered and mineralized rocks producing acid, while AMD is acid production from sulfide materials generated by mining activity, i.e., waste rocks and tailings [6].…”