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All Journal Budapest International Research and Critics Institute-Journal (BIRCI-Journal): Humanities and Social Sciences International Journal of Environmental, Sustainability, and Social Science Jurnal Bisnis Mahasiswa Journal of Governance, Taxation, and Auditing International Review of Practical Innovation, Technology and Green Energy (IRPITAGE) Journal of Advances in Accounting, Economics, and Management Jurnal Pengabdian Masyarakat dan Riset Pendidikan
Robertho Kadji
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Religion Arts Humanities Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Environmental Science Languange, Linguistic, Communication & Media Mathematics Social Sciences Other

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Water Quality and Hydrochemical Studies in Watersheds Cikapundung River Case Study Peny Supriatno; Rizky Syaputra; Robertho Kadji; Lia Alfianita
Budapest International Research and Critics Institute-Journal (BIRCI-Journal) Vol 5, No 3 (2022): Budapest International Research and Critics Institute August
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birci.v5i3.6010

Abstract

Cikapundung River is one of the rivers that plays an important role as a water source in the city of Bandung. This river has great potential to be used as water supply in the city of Bandung. For further utilization, it is necessary to study the quality and hydrochemistry of water in the watershed (DAS), especially in the Cikapundung River. Based on the studies that have been carried out, it was found that the water quality is quite poor. Poor water quality is caused by a continuous process of pollution, which causes changes in the value of the physical and chemical parameters of water in the Cikapundung watershed. This process is further supported by the occurrence of dilution caused by the high intensity of rain in the city of Bandung. According to the graphical representation of the hydrochemistry of water, the type of water in the form of calcium bicarbonate was obtained based on the Piper Diagram. Bicarbonate water comes from the weathering of rocks or minerals near the surface. Supported by graphical representation using Durov Diagram, water in the Cikapundung watershed is intermediate water that has undergone ion exchange. This is evidenced by the Stiff Diagram which groups alkaline earth cations which are larger than alkali metals, and weak acid anions which are larger than strong acid anions. These three graphic representatives provide information about the evolutionary processes that occur in the Cikapundung watershed.
Analisis Studi Kelayakan Ekonomi Penambangan Sirtu di PT Danang Mandiri Desa Tuapanaf Kecamatan Takari Kabupaten Kupang Provinsi Nusa Tenggara Timur Kadji, Robertho; Boymau, Irene Augusta; Bouk, Maria Claudia Cindy
Journal of Advances in Accounting, Economics, and Management Vol. 2 No. 4 (2025): June
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/aaem.v2i4.754

Abstract

Penelitian ini menyajikan analisis kelayakan ekonomi terhadap proyek penambangan sirtu yang dilakukan oleh PT Danang Mandiri di Desa Tuapanaf, Kecamatan Takari, Kabupaten Kupang, Provinsi Nusa Tenggara Timur. Proyek ini mencakup area tambang seluas 5 hektar yang beroperasi dengan izin produksi yang sah, berlokasi di wilayah kaya sumber daya mineral yang berperan penting dalam pengembangan ekonomi lokal dan regional. Evaluasi keuangan menggunakan tiga metode utama: Net Present Value (NPV), Internal Rate of Return (IRR), dan Payback Period (PBP). NPV yang positif sebesar Rp699.390.592,22 menunjukkan bahwa proyek ini menghasilkan nilai ekonomi yang signifikan melebihi investasi awal. IRR sebesar 12,59%. PBP selama 2,77 tahun mencerminkan periode pengembalian modal yang relatif singkat, menandakan risiko likuiditas yang dapat dikelola. Ketiga indikator ini secara kolektif memberikan penilaian menyeluruh terhadap profitabilitas dan risiko, yang sangat penting untuk proyek tambang yang rentan terhadap volatilitas pasar dan ketidakpastian operasional. Integrasi indikator ini mendukung manajemen risiko yang efektif dan pengambilan keputusan yang tepat dan dinyatakan layak secara ekonomis untuk dilaksanakan. Studi ini memberikan dasar yang kuat bagi perusahaan dan pemangku kepentingan dalam melanjutkan kegiatan penambangan dengan keyakinan finansial yang memadai.
Kajian Kelayakan Air Tanah melalui Analisis Hidrogeologi dan Geolistrik di Desa Bone, Kabupaten Kupang : Penelitian Irene Augusta Boymau; Noni Banunaek; Robertho Kadji
Jurnal Pengabdian Masyarakat dan Riset Pendidikan Vol. 3 No. 4 (2025): Jurnal Pengabdian Masyarakat dan Riset Pendidikan Volume 3 Nomor 4 (April 2025
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jerkin.v3i4.1527

Abstract

Air bersih adalah kebutuhan dasar yang sangat penting untuk kehidupan manusia dan makhluk hidup lainnya. Air juga penting digunakan untuk sektor ekonomi seperti industri, pertanian, hingga energi. Pemenuhan kebutuhan air menjadi tantangan tersendiri bagi wilayah yang jauh dari sumber mata air permukaan serta memiliki curah hujan yang kurang. Salah satu daerah yang mengalami keterbatasan sumber air adalah Desa Bone, Kabupaten Kupang. Sebagai cara untuk mengatasi keterbatasan ini, dinas PUPR berebcana untuk melakukan pemboran untuk memenuhi kebutuhan air 20 KK. Namun, sebelum dilakukan aktivitas pemboran, maka penting untuk melakukan analisis hidrogeologi dan geolistrik untuk mengetahui keadaan dan karakteristik lingkungan. Adapun tujuan dari penelitian ini adalah untuk menganalisis kondisi dan karakteristik lingkungan yang selanjutnya hasil analisis ini diberikan sebagai rekomendasi terhadap dinas PUPR. Analisis dilakukan dengan hidrogeologi dan geolistrik. Hasil analisis dikaji secara deskriptif dengan mengintegrasikan temuan lapangan. Hasil penelitian menunjukkan bahwa akuifer di wilayah tersebut bersifat tipis dan terbatas, hanya ditemukan pada batu gamping seluas sekitar 8 hektare dengan debit kecil. Dusun 4 Desa Bone tidak memiliki potensi airtanah yang memadai untuk pemboran. Alternatif pemenuhan air bersih dapat dilakukan melalui sumur gali di sekitar kolam Bone atau pemboran di dataran tinggi Banbiu–Kuanana dengan potensi debit 1 liter per detik yang kemudian dialirkan ke Dusun 4.
WATERFALL ANALYSIS APPROACH IN THE DEVELOPMENT OF THE BONEN CAVE TOURISM WEBSITE AS A DIGITAL INFORMATION AND PROMOTION MEDIA Robertho Kadji; Irene Augusta Boymau; Lidia Paskalia Nipu; Ika Fitri Krisnasiwi
International Review of Practical Innovation, Technology and Green Energy (IRPITAGE) Vol. 5 No. 1 (2025): March-June 2025
Publisher : RADJA PUBLIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54443/irpitage.v5i1.3394

Abstract

This research covers the developing of the Bonen Cave tourism website as a digital platform for promoting geotourism, employing the Waterfall model of software development. The project aims to design and implement a website that effectively conveys the distinctive values of Bonen Cave in Baumata Village, Kupang, acknowledging the increasing significance of digital media in promoting tourism visibility, especially for geotourism sites with substantial geological and cultural heritage. The method consists of five successive phases: requirements analysis, system design, implementation, testing, and deployment. The data collection process encompassed stakeholder interviews and field surveys to ensure website features corresponded with local requirements and visitor anticipations. An accessible and responsive design was developed using a no-code website builder. The finished project, geowisatakupang.fun, encompasses multimedia information, interactive services, and functionalities designed to facilitate education, preservation, and community involvement. Testing validated the site's usability and operation across various devices. The project illustrates how organized digital development may enhance local communities, facilitate conservation initiatives, and advance sustainable tourism via accessible online platforms. Ongoing assessment and prospective incorporation of augmented reality and mobile applications are advised to improve user experience and sustain long-term effects.
Economic Feasibility Analysis of Mining Business Plan CV. XYZ, Golopongkor Village, Komodo District, West Manggarai Regency KADJI , Robertho
Journal of Governance, Taxation and Auditing Vol. 3 No. 3 (2025): Journal of Governance, Taxation and Auditing (January - March 2025)
Publisher : PT Keberlanjutan Strategis Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38142/jogta.v4i1.1437

Abstract

This research aims to evaluate the economic feasibility of the mining business plan proposed by CV. XYZ is located in Golopongkor Village, Komodo District, West Manggarai Regency, with an operational production area of 4.27 Ha. The analysis was conducted using three main indicators, namely Net Present Value (NPV), Internal Rate of Return (IRR), and Payback Period (PBP), to assess the profitability and feasibility of the investment. The research results show that the positive NPV value of Rp1,130,299,085.00 indicates that the project is capable of providing economic benefits that exceed the initial investment value. The IRR value of 39% and the PBP of 0.7 years reflect a relatively quick capital recovery period. These values indicate that the mining project is economically feasible and provides significant financial benefits. The expected future cash flows exceed the initial investment, and the quick payback period reinforces the recommendation that this project is feasible. With high profit potential and controlled financial risks, this project is deemed capable of contributing to business growth and the operational sustainability of the company.
Analisis Investasi Kegiatan Removal Overburden Pada Blok B Pit Manis PT Sumber Permata Mineral Bouk, Maria Claudia Cindy; Kadji, Robertho A.; Sundari, Woro; Ndolu, Rizhard A.
Jurnal Bisnis Mahasiswa Vol 5 No 4 (2025): Jurnal Bisnis Mahasiswa
Publisher : PT Aksara Indo Rajawali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60036/jbm.761

Abstract

PT Sumber Permata Mineral merupakan salah satu perusahaan yang bergerak dalam bidang pertambangan dengan bahan galiannya nikel, yang berlokasi di Desa Molino, Kecamatan Petasia Timur, Kabupaten Morowali Utara, Provinsi Sulawesi Tengah, dengan luas wilayah IUP 176 Ha. Pada perusahaan tersebut akan dilakukan kegiatan removal overburden pada blok B PIT Manis. Dalam pelaksanaan kegiatan tersebut, ternyata perusahaan sering mengalami overbudget yang mengakibatkan kerugian. Maka dari itu penelitian ini dibuat dengan tujuan untuk merincikan cash flow dan menggunakan metode analisis investasi dengan beberapa parameternya. Dari Hasil perhitungan parameternya didapat hasil bahwa Net Present Value dengan nominal Rp149.356.980.771; sebagai khas bersih yang akan diterima perusahaan. Internal Rate of Return atau laju pengembalian modal dengan presentase 73%, serta Payback Period atau periode pengembalian modal 0,42 tahun. Dari hasil perhitungan analisis investasi dengan menggunakan parameter tersebut, maka investasi yang akan ditanamkan senilai Rp20.798.115.400; dalam kegiatan tersebut dinyatakan layak.
Economic Feasibility Analysis of Mining Bussiness Plan CV. XYZ, Golopongkor Village, Komodo District, West Manggarai Regency KADJI , Robertho
International Journal of Environmental, Sustainability, and Social Science Vol. 6 No. 5 (2025): International Journal of Environmental, Sustainability, and Social Science (Sep
Publisher : PT Keberlanjutan Strategis Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38142/ijesss.v6i5.1450

Abstract

This research aims to evaluate the economic feasibility of the mining business plan proposed by CV. XYZ located in Golopongkor Village, Komodo District, West Manggarai Regency, with an operational production area of 4.27 Ha. The analysis was conducted using three main indicators, namely Net Present Value (NPV), Internal Rate of Return (IRR), and Payback Period (PBP) to assess the profitability and feasibility of the investment. The research results show that the positive NPV value of Rp1,130,299,085.00 indicates that the project is capable of providing economic benefits that exceed the initial investment value. The IRR value of 39% and the PBP of 0.7 years reflect a relatively quick capital recovery period. These values indicate that the mining project is economically feasible and provides significant financial benefits. The expected future cash flows exceed the initial investment, and the quick payback period reinforces the recommendation that this project is feasible. With high profit potential and controlled financial risks, this project is deemed capable of contributing to business growth and the operational sustainability of the company.
Co-Authors Banunaek, Noni Bouk, Maria Claudia Cindy Boymau, Irene Augusta Ika Fitri Krisnasiwi Irene Augusta Boymau Lia Alfianita Lidia Paskalia Nipu Ndolu, Rizhard A. Peny Supriatno Rizky Syaputra Sundari, Woro