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All Journal Journals Mining Engineering : Bina Tambang Jurnal Penelitian Pendidikan IPA (JPPIPA) Science and Environmental Journals for Postgraduate
Triyanchy Afaz
Universitas Negeri Padang
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics Social Sciences

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Analisis Kelayakan Investasi Menggunakan Metode Discounted Cash Flow pada Tambang Aspal PT. Wijaya Karya Bitumen di Desa Nambo Kecematan Lasalimu, Kabupaten Buton, Sulawesi Tenggara Triyanchy Afaz; Mulya Gusman
Journals Mining Engineering : Bina Tambang Vol 6, No 2 (2021): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v6i2.111703

Abstract

Abstract. PT. Wijaya Karya Bitumen is a company that plans to mine asphalt with an IUP area of 100 HA in Nambo Village, Lasalimu District, Buton Regency, Province of Sulawesi Tenggara. The total reserves are 5.945.000 tons with a selling price of IDR 270.000 / ton which is estimated to have a mining life of 16 years. This study aims to analyze the feasibility of investing in asphalt mining in terms of technical, economic and environmental aspects, using the discounted cash flow (DCF) feasibility analysis method to see whether a mine with asphalt production is feasible or not. The investment feasibility analysis parameters used are net present value (NPV), internal rate of return (IRR), pay back period (PBP) and profitability index (PI).The results of this study, obtained cash out flow of IDR 646.677.059.124 and cash in flow of IDR 2.088.966.982.500. Based on the discounted cash flow (DCF) method, the NPV results were IDR 206.854.298.263, an IRR of 15.99%, PBP for 3 years and 3 months and a PI of 3,127.Keywords : Investment Feasibility, Discounted Cash Flow (DCF), Technical Aspects,Economic Aspects, and Environment.
Analysis of the Impact of Coal Mineacid Water on River Water Quality, Biota, and Human Health Around Mining Triyanchy Afaz; Abdul Razak; Nurhasan Syah; Skunda Diliarosta; Mulya Gusman
Science and Environmental Journal for Postgraduate Vol 6 No 1 (2023): Science and Environmental Journals for Postgraduate (SENJOp)
Publisher : Postgraduate School, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/senjop.v6i1.226

Abstract

Acid Mine Drainage (AMD) or Acidic Acidic Drainage (AAT) is a type of water runoff that happens when certain sulfide minerals in rocks come in contact with water and oxygen, triggering an oxidation process that results in water with acidic properties. To understand more about this phenomenon, a literature review was conducted using relevant keywords on online information sources. The indicators used to measure the level of acidity in mine water include pH, metal concentration, Total Suspended Solid (TSS) or turbidity level, electrical conductivity, sulfate, and sulfuric acid content. High electrical conductivity in mine water usually indicates the presence of metals such as iron (Fe) and manganese (Mn). High levels of manganese (Mn) in water can cause health problems for humans. Moreover, an increase in the concentration of Fe can cause an increase in turbidity or TSS because iron metal can dissolve in air and form solid particles that can cause turbidity. To reduce acidity and environmental pollution, passive or active treatment techniques can be used to neutralize AMD.
Analysis of the Impact of Coal Mine Acid Water on River Water Quality, Biota, and Human Health Around Mining Triyanchy Afaz; Abdul Razak; Nurhasan Syah; Skunda Diliarosa; Mulya Gusman
Science and Environmental Journal for Postgraduate Vol 6 No 2 (2024): Science and Environmental Journals for Postgraduate (SENJOp)
Publisher : Postgraduate School, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/senjop.v6i2.228

Abstract

Acid Mine Drainage (AMD) or Acidic Acidic Drainage (AAT) is a type of water runoff that happens when certain sulfide minerals in rocks come in contact with water and oxygen, triggering an oxidation process that results in water with acidic properties. To understand more about this phenomenon, a literature review was conducted using relevant keywords on online information sources. The indicators used to measure the level of acidity in mine water include pH, metal concentration, Total Suspended Solid (TSS) or turbidity level, electrical conductivity, sulfate, and sulfuric acid content. High electrical conductivity in mine water usually indicates the presence of metals such as Iron (Fe) and Manganese (Mn). High levels of Manganese (Mn) in water can cause human health problems. Moreover, an increase in the concentration of Iron Metal (Fe) can cause an increase in turbidity or TSS because iron metal can dissolve in air and form solid particles that can cause turbidity. Passive or active treatment techniques can neutralize AMD to reduce acidity and environmental pollution.
Analisis Dampak Air Asam Tambang Batubara Terhadap Kualitas Air Sungai dan Dampaknya Bagi Masyarakat Pengguna Air Sungai Triyanchy Afaz; Mulya Gusman; Eri Barlian; Nurhasan Syah
Jurnal Penelitian Pendidikan IPA Vol 11 No 2 (2025): February
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i2.9645

Abstract

This study aims to examine the impact of AAT on the water quality of the Purian River and its implications for communities that depend on this water source. Acid mine drainage, which is formed due to the oxidation of sulfide minerals, can reduce water quality, potentially affecting the health and economy of the user community. The research methods applied include quantitative and qualitative approaches. The analysis was carried out using a correlation test to measure the relationship between water quality between the point of compliance and the Parambahan River, and the Chi-Square test was used to evaluate the relationship between seasonal mining activities and health problems experienced by respondents. In addition, a survey was conducted to explore local community perceptions regarding the impact of river water. The results of the study indicated mild pollution in several water quality parameters, especially TSS and heavy metals, which exceeded the quality standard limits. Water quality status was measured using the Pollution Index based on PP No. 22 of 2021 and Kepmen LH No. 113 of 2003. The results showed that most samples were classified as mild pollution. Correlation analysis indicated that AAT was not the only factor causing pollution, due to seasonal mining activities and the contribution of water use for livestock farming practices. The conclusion is that waste management carried out by PT. AICJ meets government quality standards, at 66.67%, but respondents still feel negatively affected by mining activities.
Co-Authors Abdul Razak Eri Barlian Mulya Gusman Nurhasan Syah Skunda Diliarosa Skunda Diliarosta