Article Per Year (5 Year)
p-Index From 2020 - 2025
4.772
P-Index
This Author published in this journals
All Journal Atom Indonesia Journal IJOG : Indonesian Journal on Geoscience Jurnal RISET Geologi dan Pertambangan Journal of Degraded and Mining Lands Management Jurnal Ilmiah Dinamika Rekayasa (DINAREK) UNEJ e-Proceeding Jurnal Teknologi Mineral dan Batubara Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Indonesian Journal of Chemistry Jurnal GEOSAPTA TEKNOLOGIA KURVATEK ASEAN Journal of Chemical Engineering Indonesian Journal on Geoscience Indonesian Journal on Geoscience Action Research Literate (ARL) Journal of Applied Geology Ophiolite : Jurnal Geologi Terapan Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII JAGE Sainteks: Jurnal Sain dan Teknik Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Jurnal Teknologi Mineral dan Batubara Jurnal Geosaintek
I Wayan Warmada
Departemen Geologi, Fakultas Teknik, Universitias Gadjah Mada
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation

Published : 69 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 69 Documents
Search

 3   4   5   6   7 
Pemetaan Kerentanan Gerakan Tanah di Kecataman Ungaran Timur, Kabupaten Semarang Deviana Shinta Maulana; I Gde Budi Indrawan; I Wayan Warmada
Action Research Literate Vol. 8 No. 2 (2024): Action Research Literate
Publisher : Ridwan Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46799/arl.v8i2.234

Abstract

Ungaran Timur merupakan salah satu daerah rawan longsor di Kabupaten Semarang. Pusat Vulkanologi dan Mitigasi Bencana Geologi (2016) telah melakukan penelitian mengenai kerentanan gerakan massa pada Kota Salatiga dan Kabupaten Semarang, Provinsi Jawa Tengah dengan skala 1:250,000, namun diperlukan peta yang lebih rinci untuk mitigasi longsor di tingkat kecamatan. Penelitian ini dilakukan untuk menyusun peta kerentanan gerakan tanah di Kecamatan Ungaran Timur dengan skala lebih detil menggunakan metode Weight of Evidence (WoE). Litologi, kemiringan lereng, tata guna lahan, elevasi, jarak dari kelurusan, jarak dari jalan, jarak dari sungai dan Normalized Difference Vegetation Index (NDVI) dianggap sebagai faktor-faktor penyebab longsor di wilayah studi. Hasil penelitian menunjukkan bahwa wilayah penelitian terdiri dari zona kerentanan gerakan tanah sangat rendah, rendah, sedang, dan tinggi yang tersebar merata. Parameter yang paling berpengaruh dengan kejadian tanah gerakan tanah adalah kemiringan lereng, ketinggian tempat, jarak dari jalan raya dan jarak dari sungai. Hasil analisis memiliki tingkat prediksi terhadap gerakan tanah di daerah penelitian cukup baik
PENGARUH MUTASI TERHADAP AKTIVITAS BIOLEACHING MANGAN BAKTERI PENGOKSIDASI SULFUR Muhammad Zulfikrie; Wahyu Wilopo; I Wayan Warmada; Endah Retnaningrum
Jurnal Teknologi Mineral dan Batubara Vol 18 No 3 (2022): Jurnal Teknologi Mineral dan Batubara Edisi September 2022
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol18.No3.2022.1158

Abstract

Mangan merupakan jenis logam berat yang banyak digunakan dalam aktivitas manusia. Saat ini teknologi bioleaching menjadi alternatif dalam penambangan mangan karena dinilai lebih efektif dan ramah lingkungan. Kelompok bakteri pengoksidasi sulfur diketahui berpotensi dalam melakukan bioleaching mangan. Bakteri pengoksidasi sulfur dengan kode isolat MN1E telah berhasil diperoleh dari sumber air panas di Candi Gedong Songo, Semarang. Penelitian ini bertujuan untuk mengetahui pengaruh mutasi sinar ultraviolet (UV), sodium nitrit (NaNO2), dan dietil sulfat (DES), serta kombinasinya dengan berbagai waktu paparan (5,10, 15 menit) terhadap kemampuan bioleaching mangan dan ketahanan terhadap H2O2 dari isolat MN1E tersebut. Kemampuan bioleaching mangan diukur menggunakan metode Atomic Absorption Spechtrofotometry (AAS) selama 18 hari. Aktivitas bioleaching mangan tertinggi dilakukan oleh isolat mutan N5 dan D10 pada hari ke-18 dengan nilai persentase pelarutan masing-masing sebesar 14,22% dan 14,09%. Isolat mutan N5 memiliki ketahanan paling baik terhadap paparan H2O2. Isolat MN1E teridentifikasi sebagai anggota spesies Staphylococcus pasteuri dan potensial untuk diaplikasikan pada proses penambangan bijih mangan.
Landslide susceptibility mapping in East Ungaran, Indonesia: A comparative study using statistical methods Maulana, Deviana Shinta; Indrawan, I Gde Budi; Warmada, I Wayan
Journal of Degraded and Mining Lands Management Vol. 11 No. 4 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.114.6107

Abstract

East Ungaran, is one of landslide prone areas in Semarang Regency, Indonesia. In addition to provide a more detail map of landslide susceptibility, the objective of this research was to compare performance of three widely used methods, which are the Weight of Evidence (WoE), Logistic Regression (LR) and combined Weight of Evidence (WoE) – Logistic Regression (LR), for landslide susceptibility mapping. Slope, elevation, lithology, land use, normalized difference vegetation index (NDVI), distance from lineament, distance from river, and distance from road were considered as landslide controlling parameters in the research area and were used as input variables in the landslide susceptibility zonation. The results showed that the slope, elevation, and distance from the road are significant parameters causing the landslides. The research area is divided into very low, low, moderate, and high landslide susceptibility zones. The WoE performs better than the LR, while the combined WoE-LR method performs the best among the three methods in predicting landslide susceptibility in this area. The landslide susceptibility map developed using the combined WoE-LR method is suggested to be used for landslide mitigation planning of this area.
Estimasi Sumberdaya Skarn Logam Dasar Dengan Metode Geostatistik Ordinary Kriging Blok A Ruwai Kabupaten Lamandau Provinsi Kalimantan Tengah Riyadi, Hasan; I Wayan Warmada; Anastasia Dewi Titisari; Arifudin Idrus
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This research aims to determine the shape of the block model and the distribution of ore deposits and to determine the results of the resource estimation of base metal skarn. Mineral resource estimation reflects the shape and distribution of a mineral deposit so that it can be used as a basis for estimating reserves or mining activities. The data used in this study are the results of exploration drilling, namely collar, assay, survey and lithology. The estimation of base metal skarn resources in this study uses the ordinary kriging method with a block model measuring 10m x 5m x 3m. The results of the estimation of metal skarn resources of Block A Ruwai using the method obtained tonnage for inferred resources of 19,452 tons, indicated 29,542 tons and measured 16,546 tons with an average Pb-Zn content of 10.71%, 10.85% and 11.51%. The estimation results of the ordinary kriging method were compared with the composite data of Pb-Zn content (raw initial data) to determine its accuracy based on cross validation parameters. From the cross validation results, the RMSE (root mean square error) value is 0.40 which is close to 0 (zero), the correlation coefficient (r) is 0.83 and the coefficient of determination (r2) is 0.7 which is close to 1, so the estimation results are considered good enough.
Geological Investigation of Clay Minerals (Swelling) Pt. Upb Antam Pongkor Bogor, West Java, Indoneisa Gevor, Even; Indrawan, I Gde Budi; Warmada, I Wayan
Journal of Applied Geology Vol 9, No 1 (2024)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.97600

Abstract

Rocks containing clay minerals can experience rock deformation when interacting with water, this can also caused by the argillic zone, in the underground tunnel at the Unfoloader 600 and Xc 600 loop 2 ciurug. The argillic process that causes actual material swelling that occurs in field causes rock mass around the mining development area to become weak. The location from tunnel cross cut of Unfoloader 600 and Xc 600 loop 2 contain active clay minerals which high percentage composition of swelling mineral material. The Unfoloader 600 location has a mineral swelling composition of 102.94% with 24 hours, justifying potential very high swelling. The minerals present based on XRD testing 70.8% illite, 25.4% kaolinite, 25.4% kaolinite and 3.8% montmorillonite. Location Xc 600 loop 2 has a mineral swelling composition of 131.25% with 24 hours, justifying potential for very high swelling. The minerals present based on XRD testing illite 49.7%, kaolinite 28.7%, quartz 20.3%, and montmorillonite 1.2%. The values obtained based on laboratory form free swelling tests and XRD that the location experienced of rock deformation, it’s swelling in the mining development area.
Geo-engineering characterization of mining material: A case study in Yogyakarta, Indonesia Budianta, Wawan; Warmada, I Wayan; Hideki, Ohta; Takemura, Jiro
Journal of Degraded and Mining Lands Management Vol. 12 No. 3 (2025)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2025.123.7839

Abstract

The extraction and processing of aggregates in quarrying operations leads to environmental degradation through various engineering methods. This study investigated the geo-engineering properties of tertiary volcanic rocks mined from various sites in Sleman and Bantul District, Yogyakarta Province. A total of twelve rock samples were obtained from the study area. This study conducted mineralogical and geotechnical engineering investigations, including microscopic analysis, unconfined compressive strength (UCS) tests, abrasiveness tests (CAI), and rock abrasivity index (RAI) calculations. Mineralogical observation using polarisation microscopy indicated that the rock samples consist of quartz, plagioclase, lithic fragments, and volcanic glass. The UCS test showed varying rock strengths due to resistant minerals in the samples. Similarly, the CAI values varied and were influenced by the quartz mineral content, which is representative of resistant minerals. The Rock Abrasivity Index (RAI) calculation classified the samples as less abrasive, and this characteristic is also affected by quartz content. A significant correlation was observed between the quartz mineral content and the UCS, CAI, and RAI values. This relationship suggests that the quartz mineral content substantially affects the UCS, CAI, and RAI values of the rock samples in the study area. The findings of this study can be used to enhance mining practices and minimize their ecological impact.
HIDROGEOLOGI DAN HIDROKIMIA AIR TANAH PADA AREA PENAMBANGAN EMAS TRADISIONAL DI WILAYAH KALIREJO, KOKAP, KULON PROGO, DAERAH ISTIMEWA YOGYAKARTA Riana Listiyastuti; Lestari Sutra Simamora; Muhamad Ilham; I Wayan Warmada; Doni Prakasa Eka Putra
Jurnal Geosaintek Vol. 11 No. 1 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v11i1.2352

Abstract

Kondisi air tanah di suatu daerah secara alami dipengaruhi oleh faktor geologi dan hidroklimatologi namun dapat berubah akibat aktivitas manusia. Daerah penelitian berada di Kalirejo, Kokap, Kulon Progo yang secara geologi tersusun oleh litologi batuan beku intrusi beserta dengan produk alterasi dan mineralisasinya. Alterasi dan mineralisasi di area ini berasosiasi dengan potensi emas, sehingga banyak dijumpai tambang emas dan pengolahan emas skala kecil yang dikelola masyarakat. Berdasarkan litologinya, hidrogeologi Kalurahan Kalirejo merupakan daerah air tanah langka. Penelitian ini bertujuan untuk menentukan model konseptual hidrogeologi di wilayah ini dan karakteristik hidrokimia air tanahnya melalui evaluasi data geologi, analisis sifat fisika-kimia, serta analisis kandungan ion mayor pada air tanah dalam keterkaitan dengan dampak kegiatan pertambangan terhadap air tanah. Observasi lapangan dan 28 sampel air tanah telah diambil mewakili kondisi geologi dan kegiatan tambang emas. Analisis data  geologi primer dan sekunder serta analisis menggunakan Ion Chromatography (IC) dan titrasi dilakukan untuk sampel air. Hasil penelitian menunjukkan bahwa sebagian besar air tanah di area penelitian memiliki karakteristik yang serupa, yakni berasal dari akuifer dangkal yang terbentuk dari hasil pelapukan dan rekahan batuan (fractured rock aquifer). Pada beberapa area di daerah penelitian terdapat anomali kandungan sulfat pada air tanah yang cukup tinggi yang disebabkan oleh pelarutan dari mineral sulfat dan sulfida yang intensif dalam kaitannya dengan proses alterasi hidrotermal serta pembentukan air asam tambang akibat aktivitas penambangan yang ada.
Pencemaran Besi dan Mangan pada Airtanah di Kota Palu, Sulawesi Tengah Atmaja, Ammar Dwi; Wilopo, Wahyu; Warmada, I Wayan
Journal of Applied Geoscience and Engineering Vol 4, No 1 : Juni 2025
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jage.v4i1.31239

Abstract

Palu City is one of the major cities on Sulawesi Island, experiencing rapid population and economic growth. However, the 2018 earthquake, tsunami, and liquefaction events caused infrastructure and environmental damage, affecting water resources in the area. Therefore, this study aims to determine the pH, temperature, DHL, TDS, and iron and manganese content of groundwater. The study was conducted by directly measuring the physical and chemical properties of groundwater in 25 water sources, including springs, dug wells, and drilled wells. In addition, groundwater and aquifer material samples were taken for laboratory testing using AAS and XRD. The results of the study showed that the groundwater pH ranged from 7.0 - 8.3, temperature 27.4 oC to 36.1oC, TDS ranged from 170mg/L – 4,733 mg/L, DHL ranged from 341µS/Cm – 9,513µS/Cm, iron content 0.1 – 0.26 mg/L and manganese content 0.16 mg/L – 0.38 mg/L. The source of iron and manganese is indicated to come from the aquifer as shown by the XRD results containing Hematite, Magnetite and Pyrolusite minerals not from anthropogenic activities.
Synthesis of Lithium-Aluminum Layered Double Hydroxide Adsorbent from Aluminum Waste to Create a More Environmentally Friendly Process for Recovering Lithium in Brine Salafudin, Salafudin; Prasetya, Agus; Warmada, I Wayan; Petrus, Himawan Tri Bayu Murti
Indonesian Journal of Chemistry Vol 25, No 4 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.97024

Abstract

All countries pledged to strive to limit global warming. The implementation of renewable energy must be accelerated. One of the most essential components of renewable energy is lithium-ion batteries. The surging demand for lithium necessitates new technologies for direct recovery from brine. One of the most promising methods is adsorption. Because of its advantages, lithium-aluminum layered double hydroxides have started their application on a commercial scale. This research uniquely explores the synthesis of lithium adsorbent from aluminum waste, an approach that is both cost-effective and environmentally sustainable. The reaction behavior was studied, including the rate of hydrogen gas production and the co-precipitation process. The quality of the product was assessed by its adsorption capacity and characterization. The synthesis of lithium adsorbent was successfully performed through two-step processes, with the reaction kinetics studied at temperatures between 30 and 60 °C. XRD and FTIR results confirmed the adsorbent product. The adsorbent worked well for synthetic brine with 39–1350 ppm lithium concentration and adsorption capacity until 6.7 mg lithium ion per g of adsorbent. These findings contribute to the development of sustainable technologies for lithium extraction and can be applied to improve industrial lithium recovery processes.
Co-Authors A. Harijoko A. Imai A. Imai A. M. Imran A. W. Yogatama Agung Harijoko Agus Prasetya Ahmad Aminuddin, Muhammad Irman Khalif bin Akira Imai Al-Furqan, Reza Aldian Fahrialam Alvian Rizky Yanuardian Anastasia Dewi Titisari Anita Yuliyanti Anita Yuliyanti Ariffin, Kamar Shah Arifudin Idrus Arifudin Idrus Arifudin Idrus Arifudin Idrus Atmaja, Ammar Dwi Aulia Rahmah Karunianti Aung Tay Zar Aung Tay Zar, Aung Tay Bhakti H. Harahap Bhakti H. Harahap Bunchoeun Pich Chusni Ansori Denizar Rahman Deviana Shinta Maulana Dian Novia Sartika Dian Yesy Fatimah Diyan Aditya Putra Pratama Doni Prakasa Eka Putra Ega Gita Prasastia Endah Retnaningrum Endah Retnaningrum Endang Tri Wahyuni F. Pratiwi Fadlin Fadlin Fadlin Fadlin Fadlin Fadlin Fadlin, Fadlin Franz Michael Meyer Franz Michael Meyer Franz Michael Meyer, Franz Michael Gevor, Even Hakim, Fahmi Haryono, Septiawan Nur Hasria Hasria Hasria Hasria Hasria Hasria, Hasria Herry Yogaswara Heru Hendrayana Hideki, Ohta Himawan Tri Bayu Murti Petrus Hirajima, Tsuyoshi Htun, Tin May I Gde Budi Indrawan I. G. Sukadana I. Nur I. Nur I. Nur Imai, A. Imai, Akira Irzal Nur Irzal Nur, Irzal Iwan Setiawan Jochen Kolb Johan Syafri Mahathir Ahmad Kaharuddin Kaharuddin Kaharuddin, Kaharuddin Kamar Shah Ariffin Kant, Win Kha Yay Oo Khant, Win Koichiro Watanabe Koichiro Watanabe Koichiro Watanabe Koichiro Watanabe Koichiro Watanabe Koichiro Watanabe, Koichiro Kolb, Jochen Kotaro Yonezu Kusumaningrum, Serafica Btari Christiyani Kyaw Linn Zaw Leonardo Anthony Wijaya Lestari Sutra Simamora Linn Zaw, Kyaw Lucas Donny Setijadji Makruf Nurudin Martadiastuti, Vanadia Maulana, Deviana Shinta Mochammad Aziz Mochammad Aziz, Mochammad Mudinillah, Adam Muhamad Ilham Muhammad Irman Khalif bin Ahmad Aminuddin Muhammad Zulfikrie Mutiara Selvina Myo Min Tun Myo Min Tun Myo Min Tun Naing Oo, Toe Nugroho Imam Setiawan Nur, I. Nur, I. Okki Verdiansyah Okki Verdiansyah Okki Verdiansyah Oo, Than Than Pich, Bunchoeun Pramumijoyo, Pranayoga Pramumijoyo, S. Pranayoga Pramumijoyo Prasastia, Ega Gita Putra Pratama, Diyan Aditya Rahman, Denizar Retno Hartati Reza Al-Furqan Riana Listiyastuti Riyadi, Hasan Rodhie Saputra S. Pramumijoyo S. Pramumijoyo Salafudin Salafudin, Salafudin Sang Kompiang Wirawan Saputra, Rodhie Sartika, Dian Novia Seang Sirisokha Septiawan Nur Haryono Sirisokha, Seang Soewondo, Widiasmoro Subagyo Pramumijoyo Subagyo Pramumijoyo, Subagyo Sufriadin, Sufriadin Sukmandaru Prihatmoko Sukmandaru Prihatmoko Syafruddin Maula Syafruddin Maula T. B. Adimedha Takemura, Jiro Tetsuro Yoneda Than Than Oo Tin May Htun Toe Naing Oo Tsuyoshi Hirajima Tsuyoshi Hirajima Tun, Myo Min Ubaidillah, Aji Syailendra Vanadia Martadiastuti Wahyu Wilopo Wawan Budianta Widiasmoro Soewondo Win Kant Win Khant Yoneda, Tetsuro Yonezu, Kotaro Yonezu, Kotaro