Characteristic of pro delta environment on coal seam PAF and NAF, warukin formation, South Kalimantan

Abstract

Coal seam of the Kusan Bawah block, Warukin Formation, Asam-Asam Basin, South Kalimantan has age middle Miosen to Late Miosen. The purpose of this study is to investigate the characteristic of the coal, PAF, and NAF, the depositional environment. The method used in this research is taking rock samples from core drilling and then testing the quality of rock geochemistry by using Net Acid Generating test. Rock geochemical analysis results are entered into modeling software to determine its distribution based on stratigraphic principle. Results of rock geochemical quality analysis based on SNI 6597- 2011 to Non-Acid Forming and Potential Acid Forming. The advantages of identification PAF or NAF value are about preventive activity to decrease acidic pollutant material in the environment. Potential Acid Forming material is above seam G and is between EL and seam D. The percentage of Potential Acid Forming material is 33.17% and NAF 66.83%. The depositional environment of the Kusan Bawah block is interpreted in pro delta and transgressive conditional.

Identification of biotic and abiotic factors coal mine overburden on Warukin rock formation of South Kalimantan

“…This is thought to be related to the presence of heavy metals in the overburden (Table 5), which are oxidized with air and water, resulting in acid mine drainage (AMD) (Bilibio et al, 2021). The decrease in substrate pH is also driven by the physicochemical properties of Warukin Formation overburden, which tends to be sandy, high in sulfide elements, and has the potential to turn the material into acid or PAF (potential acidforming) (Pratama, 2015;Agustin et al, 2020). Such levels of heavy metal contamination will be active for several centuries (Cunha et al, 2019).…”

“…Pb is a compound that provides heavy metals needed by plants in root growth, and its amount will naturally increase in soil (Świątek et al, 2019;Bloem and Ciaranek, 2021). This is influenced by the pH condition of the substrate, which tends to be acidic which is related to the physicochemical properties of the Warukin Formation overburden, which is PAF (Agustin et al, 2020;Mustafa et al, 2023).…”