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All Journal International Journal of Renewable Energy Development TEKNIK Geological Engineering E-Journal Jurnal Teknologi Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geosains dan Remote Sensing (JGRS) Jurnal Geominerba
Widiarso Dian Agus
Program Studi Teknik Geologi Universitas Diponegoro, Semarang
Chemistry Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Physics Other

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Journal : Geological Engineering E-Journal

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MIKROFASIES BATUGAMPING FORMASI BULU DAN KUALITAS BAHAN BAKU SEMEN, PADA LAPANGAN GUNUNG “PAYUNG”, KECAMATAN BOGOREJO, KABUPATEN BLORA JAWA TENGAH Fadhlillah, Ajidityo Putro; Aribowo, Yoga; Widiarso, Dian Agus
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Bulu Formation is one of formation which is sedimented at Tertiary age in The North East Java Basin. Bulu Formation has a lithological composition of limestones with kalkarenit. Bulu Formation is located in Gandu village, Tahunan Village, and the surrounding areas, District Bogorejo, Blora, Central Java, with a particular study on the "Gunung Payung".The study aimed to determine microfasies, facies zone, the relative age, and standart of quality limestone as materials cement on data petrographic, paleontologist, and chemical analysis of limestone samples in the study area. Development of Limestone Bulu Formation Unit microfacies is Bioclast Red Algae Packstone, Bioclast Large Foram Grainstone, Bioclast Large Foram Packstone, Bioclast Planktonic Foram Packstone, Bioclast Grainstone with dolomitation, Planktonic Forams Grainstone, Planktonic Wackstone, Peloidal Wackestone, Packstone with dolomitation, Bioclast Wackstone with microspar, Bioclast Planktonic Foram Wackstone, Bioclast Wackstone with dolomitation, Bioclast Packstone with dolomitation, and Dolomite limestone.Based on the analysis microfacies and foraminifera on the areas of research, there are 3 types of facies zoning based on the model of Wilson (1975), namely: FZ 5 Platform - Margin Reefs, Marine Open 7 FZ, FZ 8 Platform and Interior - Restricted to the age of rocks between N9 to N12 is the Middle Miocene. From the chemical analysis, the potential limestones in the study area can be used as raw material for cement and relationships microfacies analysis and chemical analysis showed that the pitch "Gunung Payung" has a great potential in terms of good quality which is spread of West to East direction. The west area of “Gunung Payung” has better quality of limestone as a raw material for cement than east area.
IDENTIFIKASI KARAKTERISTIK ALTERASI HIDROTERMAL DAN MINERALISASI ENDAPAN EMAS EPITERMAL DAERAH PROSPEK RAMADA, KECAMATAN CIMANGGU, KABUPATEN PANDEGLANG, PROVINSI BANTEN Chrishartantyo, Gregorius Agung; Aribowo, Yoga; Widiarso, Dian Agus; Kurniawan, Andi
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Cibaliung Gold Project area is one of the largest primary gold deposits mineralization prospect areas in the western part of Java island which is controlled by PT. Antam (Persero) Tbk.. The research area is part of the Cibaliung Gold Project area called Ramada Prospect. Administratively, Ramada Prospect located in Cimanggu Subdistrict, Pandeglang District, Banten Province. Research conducted aimed to determine the geological condition, characteristics of hydrothermal alteration and gold deposition mineralization, as well as predicting the environmental conditions of hydrothermal constituent.Research conducted with descriptive and qualitative analysis approach. The research method used consists of literature study, field observation, and laboratory test. In the literature study methods conducted assessment of the theoretical basis and previous research. Field survey methods consists of geological mapping, mapping of alteration and mineralization, as well as description and identification of rock core drilling results. In the laboratory test method conducted descriptions and identifications of petrographic, mineragraphy, and X-Ray Diffraction (XRD) to some rock samples and veins, as well as analysis of geological structure stereographic method. The research was also supported by secondary data such as AAS (Atomic Absorption Spectrometry) test results.Lithology of research area consists of tuff rock units, pyroclastic breccia rock units, and andesite lava flow rock units. Pyroclastic breccias rock units and andesite lava flow rock units are interpreted as pre-mineralization rocks, whereas tuff rock units are interpreted as post-mineralization rocks. Based on the analysis of geological structure there is interpreted strike-slip fault has affected geological conditions of the research area. Hydrothermal alteration in the research area can be divided into alteration facies of kaolinite-smectite-chlorite±quartz±carbonate-pyrite replacement-infill strong intensity and alteration facies of chlorite±epidote±sericite±quartz±carbonate-pyrite replacement-infill moderate-strong intensity. Gold deposition mineralization (Au) in the research area predominantly formed on quartz±carbonate veins. The presence of gold associated with silver (Ag) and pyrite (FeS2). The main prospect gold deposits mineralization in the research area contained in "Ramada" veins. Hydrothermal environment in research area interpreted as a low sulfidation epithermal deposition system that developed in the ancient depths of 120 m - 340 m with temperatures around 175 °C - 225 °C.
GEOLOGI, ALTERASI HIDROTERMAL DAN MINERALISASI DAERAH CIURUG DAN SEKITARNYA, KECAMATAN NANGGUNG, KABUPATEN BOGOR, PROVINSI JAWA BARAT Agus Binsar, Mohammad Tommy; Aribowo, Yoga; Widiarso, Dian Agus
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

The existence of metallic minerals in nature is closely related to geological conditions and hydrothermal alteration. hydrothermal alteration and mineralization occur due to hydrothermal solutions that change the physical and chemical properties of rocks and carrying metal elements which will be deposited on rock porosity and permeability have. hydrothermal alteration will make a special characteristic as an altered mineral association. Study of this alteration zone and mineralization will help us to make a plan for metal resources exploration. The purpose of this study was to determine the geological conditions study area include the morphology , lithology , structural geology , hydrothermal alteration zones , mineralization and determine the relationship between geology , hydrothermal alteration , and mineralization.Methods of research is using survey and analysis methods. Survey conducted by the method of data that collected in the field in the form of surface geological   mapping.   The   analysis   method     was     analysis    of    petrology, petrography, X-ray (XRD), and geological structure.Regional geomorphology of Ciurug Area classification based on Van Zuidam (1983) is divided into two units , namely units steep hilly volcanic landforms and volcanic landform units is very steep mountains. Lithology of the study area consists of older to younger andesite breccia , andesite lava, lapilli tuff , tuff , and andesite intrusion . Geological structure of the study area has a north-south direction . Hydrothermal alteration zones are present in the study area is the zone of argillic ( Illit - Kaolin ) , propylitic zone ( Smectite - Chlorite ) , and silicified zones ( Silica - Quartz ) . Mineralization in the area of research in the form of quartz veins and disseminated pyrite and chalcopyrite mineralization as ore deposits . Type of sediment deposition area of research   is  a   low   sulfidation epithermal type.
PENGARUH STRUKTUR DAN TEKTONIK DALAM PREDIKSI POTENSI COALBED METHANE SEAM PANGADANG-A, DI LAPANGAN “DIPA”, CEKUNGAN SUMATERA SELATAN, KABUPATEN MUSI BANYUASIN, PROVINSI SUMATERA SELATAN Ragil Pratiwi; Hadi Nugroho; Dian Agus Widiarso; Rana Lesmana
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

The increasing of oil and gas and energy crisis nowadays has been causing the explorationist look forthe new energy sources such as gas in shale and coal which more environmentally friendly. SouthSumatera Basin is one of Indonesian Basin which has a large potency with 183 tcf. Methane gas isstored in natural fracture of coalbeds called cleat. Cleat was produced during coalification andtectonism process.The aim of this study is to evaluate the influence of structures and tectonism processes towards theCBM potency in an area. The research methods were done by desciptive and analysis methods.Descriptive method was done by describing secondary data which contain rock mass data, andanalyzing method was done by analyzing subsurface data consist of seismic and wireline log. Thosedata were used to determine the sweetspot area and calculate gas in place in target zone of CBM.Based on geologic structure analysis, primary orientation trends which configure geologic structuresis northeast-southwest, it is a Compression Phase of Miocene-Recent. This stress configured sincline,sinistral strike-slip fault, and normal faults in tensional phase. The interesting area of CBMexploration or sweetspot area located in the northeast area, with normal faults which control fracturepermeability reach 12,22 mD, high thickness reach 14 – 18 feet (4,7 – 6 meter), and CBM targetdepth of < 6000 feet (2000 meter), and gas in place calculation reach 0,742 tcf. Completiontechniques for CBM target in study area with relatively low permability are hydraulic fracturingcompletion and horizontal well with direction of well is relatively northeast-southwest whichperpendicular with face cleat. 
GEOLOGI, ALTERASI HIDROTERMAL, DAN MINERALISASI DAERAH ONTO DAN SEKITARNYA, KECAMATAN HU’U, KABUPATEN DOMPU, PROVINSI NUSA TENGGARA BARAT Alif Febriansyah; Yoga Aribowo; Dian Agus Widiarso
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

The use of metallic minerals as raw materials is increasing. Therefore, Indonesia needs to improve metallic mineral reserves for the needs of the country and internationally to explore maximally. This can be done because some parts of Indonesia has huge reserves of metallic minerals.. This research purposed to learn about geological condition of research area involve morphology, lithology, and structure geology, determine alteration zone, and learn distribution of Copper (Cu) that contained in research area.Methodology used in this research is survey method and analysis method. Survey methos by doing surface geological mapping. Analytical method by doing petrology analyisis, petrography analysis, mineragraphy analysis, ASD analysis (Analytical Spectral Device) and sturcture geology analysis.Geomorphology of Onto and the surrounding divided into two units are volcanic very steep hill unit and volcanic steep hill unit. Lithology of research area from older  to younger are tuff, volcanic breccia and breached by porphyrytic andesite. Structure geology in research area in the form of alignment pattern by Dem Map (Digital Elevation Model) in period I direction of structure is west-east and northwest-southeast, whereas in period III direction is north-south. The alteration zone of research area are divided into advanced argillic zone associated with dickite, alunite, and kaolinite minerals; argllic zone associated with kaolinite, palygorskite, and siderite minerals; and intermediet argillic associated with palygorskite and Chlorite minerals. Mineralization of research area is in the form of stockwork and disseminated whick mineralized by pyrite and chalcopyrite as ore mineral. Type of mineralization deposition in research area is Porphyry depoosition type. The value levels of Copper in research area are potential with 1132,79 ppm in tuff unit STA. 33, STA. 35 with value levels of copper is 130,01 ppm, STA. 55 is 390,37 ppm, STA. 56 is 499,9 ppm and STA. 73 is 288,95 ppm.
HUBUNGAN KONDISI GEOLOGI TERHADAP ALTERASI HIDROTERMAL DAN MINERALISASI PADA ENDAPAN EPITERMAL DAERAH BUNIKASIH, KECAMATAN TALEGONG, KABUPATEN GARUT, PROVINSI JAWA BARAT Saumi Rahmawati; Hadi Nugroho; Dian Agus Widiarso; Okky Verdiansyah
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Hydrothermal alteration is a changed in the mineral composition of the rock as a result of interaction of hydrothermal fluids with the wall rock involving various geological environments like fault zones and volcanic eruptions zones. Hydrothermal alteration has a very close relationship with the mineralization. Mineralization is a process of inclusion of valuable rare minerals in rocks that form ore deposits. The purpose of this study is to determine the geological conditions of the mapping area and knowing the type of alteration and the relationship between alteration with the developing of ore mineralization. Research methods include field observations survey and continued by analysis methods, conducted in Bunikasih and surrounding areas, Talegong District, Garut regency, West Java. Methods of analysis undertaken include petrology, petrography, Terraspec, and structure analysis. Geological conditions of the study area consists geomorphological unit of structural steep hills and undulating hills of volcanic units (Van Zuidam, 1983). The research area is composed by rocks from old to young volcanic breccia, Andesite Lava, and tuff. Geological structures that are left slip fault of North Cibaliung, right slip thrust fault of South Cibaliung, right slip normal fault of Citutugan-Cibaliung Beet. There are prophylitic alteration (smectite, chlorite, ±illite), argillic (kaolinite, illite, smectite), advanced argillic (kaolinite, illite, alunite, silica), and silicification (vein zone). In the study area there are two types of epithermal, low sulfidation epithermal zone on Bunikasih mineralized was found that quartz manganese vein, chalcedonic vein, crustiform-colloform banded vein, and disseminated pyrite. there are 5 main vein lines with 40-100cm of thickness with a northwest-southeast direction formed on andesite and tuff, due to the style of the extensions that form the structure openings fault trending Northwest-Southeast. At high sulphidation epithermal indication zone in Datarkorot is dominated by advanced argillic alteration. Mineralization occurred is in the disseminated pyrite form and the concentrated hematite oxide mineral, goethite, and jarosite is a condition of changing sulfide mineral acids. Mineralization is controlled by lithology, by tuff unit which is interpreted lithocap of a diaterme breccia generated by a dacite porphyry intrusion.
ANALISIS POTENSI ALIRAN AIRTANAH BERDASARKAN DELINEASI NILAI PERMEABILITAS SEKUNDER, PADA TAMBANG BAWAH PERMUKAAN, CIURUG CENTRAL L. 500, UNIT BISNIS PERTAMBANGAN EMAS, PT. ANEKA TAMBANG TBK, PONGKOR, KABUPATEN BOGOR, JAWA BARAT Neli Nikla Iklima; Henarno Pudjihardjo; Dian Agus Widiarso; Yosep Purnama
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Kegiatan penambangan emas yang dilakukan oleh PT. Aneka Tambang Tbk, yang berlokasi di Desa Bantar Karet, Kabupaten Bogor, Jawa Barat, berupa pertambangan tertutup, yaitu pembuatan terowongan bawah tanah untuk pengambilan bijih emas. Penghancuran bijih emas dilakukan dengan metode blasting (peledakan) yang dilakukan pada dinding terowongan yang kerap menimbulkan masalah yang sulit diatasi, yaitu airtanah yang tiba-tiba keluar dengan debit tertentu. Akumulasi dari airtanah akan membentuk genangan air, terutama air yang keluar dengan debit besar, akan sangat mengganggu aktifitas pertambangan seperti gangguan aktivitas pekerja serta gangguan lingkungan seperti banjir.Untuk mengatasi permasalahan airtanah dalam terowongan bawah tanah diperlukan kajian hidrogeologi untuk mengetahui potensi aliran airtanah, berdasarkan besarnya nilai permeabilitas sekunder. Nilai permeabilitas sekunder didapatkan melalui metode scanline, yaitu metode pengukuran rekahan dengan membentangkan tali pada dinding terowongan yang terdapat banyak rekahan dengan panjang dan kemiringan tertentu. Rekahan yang terpotong oleh bentangan tali tersebut diukur besar strike dan dip-nya, serta diamati karakteristik rekahannya, seperti bukaan rekahan (aperture), jarak (spasi), kemenerusan (lenght), material pengisi, bentuk (shape), dan kekasaran (rough).Metode scanline dilakukan pada dinding terowongan yang basah, meneteskan air, dan mengalirkan air. Pada lokasi ramp down (jalur menurun) elevasi 450 (RY – 01), didapatkan hasil permeabilitas rata-rata sebesar 3.6 x 10-4 m/s. Untuk dinding yang teraliri oleh air, nilai permeabilitas yang didapat adalah nilai permeabilitas tertinggi yaitu 2.6 x 10-3 m/s. Sedangkan untuk akses ramp down elevasi 500 (RY – 02) didapatkan nilai permeabilitas yang lebih rendah yaitu 1.3 x 10-5 m/s. Potensi aliran airtanah tertinggi berada pada lokasi RY-01 yaitu STA 3 dan STA 6. Pada kedua stasiun pengamatan ini ditemukan aliran airtanah dengan debit yang kecil, dan untuk STA 6 merupakan akumulasi arah aliran airtanah pada peta kontur MAT. Berdasarkan nilai permeabilitas sekunder dan karakteristik rekahan dari kedua lokasi ini, lokasi RY – 01 memiliki potensi yang lebih besar untuk mengalirkan air, dibandingkan pada lokasi RY – 02.
MIKROFASIES BATUGAMPING FORMASI BULU DAN KUALITAS BAHAN BAKU SEMEN, PADA LAPANGAN GUNUNG “PAYUNG”, KECAMATAN BOGOREJO, KABUPATEN BLORA JAWA TENGAH Ajidityo Putro Fadhlillah; Yoga Aribowo; Dian Agus Widiarso
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Bulu Formation is one of formation which is sedimented at Tertiary age in The North East Java Basin. Bulu Formation has a lithological composition of limestones with kalkarenit. Bulu Formation is located in Gandu village, Tahunan Village, and the surrounding areas, District Bogorejo, Blora, Central Java, with a particular study on the "Gunung Payung".The study aimed to determine microfasies, facies zone, the relative age, and standart of quality limestone as materials cement on data petrographic, paleontologist, and chemical analysis of limestone samples in the study area. Development of Limestone Bulu Formation Unit microfacies is Bioclast Red Algae Packstone, Bioclast Large Foram Grainstone, Bioclast Large Foram Packstone, Bioclast Planktonic Foram Packstone, Bioclast Grainstone with dolomitation, Planktonic Forams Grainstone, Planktonic Wackstone, Peloidal Wackestone, Packstone with dolomitation, Bioclast Wackstone with microspar, Bioclast Planktonic Foram Wackstone, Bioclast Wackstone with dolomitation, Bioclast Packstone with dolomitation, and Dolomite limestone.Based on the analysis microfacies and foraminifera on the areas of research, there are 3 types of facies zoning based on the model of Wilson (1975), namely: FZ 5 Platform - Margin Reefs, Marine Open 7 FZ, FZ 8 Platform and Interior - Restricted to the age of rocks between N9 to N12 is the Middle Miocene. From the chemical analysis, the potential limestones in the study area can be used as raw material for cement and relationships microfacies analysis and chemical analysis showed that the pitch "Gunung Payung" has a great potential in terms of good quality which is spread of West to East direction. The west area of “Gunung Payung” has better quality of limestone as a raw material for cement than east area.
GEOLOGI DAN ALTERASI HIDROTERMAL DAERAH BANTAR KARET DAN SEKITARNYA, KECAMATAN NANGGUNG, KABUPATEN BOGOR, PROVINSI JAWA BARAT Rizal Dwi Febriyana; Yoga Aribowo; Dian Agus Widiarso
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Alteration type at zone of mineralization has its own properties and characteristics that often characterized by the presence of mineral assemblage. The existence of alteration zone occurred due to changes mineral composition of rocks as a result of interaction between fluida of hydrothermal and wall-rocks. Alteration of hydrothermal is very closely linked with mineralization. Mineralization is an assembly and accumulation process of valuable rare minerals in the rocks to form ore deposits. Geological studies related to the characteristics and distribution of alteration and mineralization will assist in the planning of exploration process in the area. The aim of this study is to know the condition of geological research area that include variation of morphology, stratigraphy, structural of geology, alteration types are develop in the study area, as well as the relationship between altered minerals the result of hydrothermal alteration to precipitate epithermal mineralization in the study area.The methods used in this study include field mapping, followed by the method of sample analysis. Method of field mapping carried out by observing the lithology, structural of geology, geomorphology and alteration at Bantar Karet and surrounding areas, Nanggung subdistrict, Bogor Regency, West Java . Method of analysis carried out by analysis of petrology, petrography, mineralgraphy , X - ray diffractometer and the structure analysis of the lineament pattern.Lithology of the research area, beginning Early Miocene with sequence from old to young are unit of laminated tuff, unit of volcanic breccia, unit of andesite lava, unit of lapilli tuff, unit of tuff and unit of dacite intrusion. Structural of geology that develop in the study area are joint, fault that related with the lineament pattern, the main direction are Southwest-Northeast and Northwest-Southeast. Geomorphology of the study area was divided into two : the unit of volcanic landforms are very steep mountains and the unit of volcanic landforms are steep hilly. Alteration zones are contained in the study area, becoming three zones, there are Chlorite ± Smectite Alteration Zone (Propylitic), Smectite Alteration Zone - Kaolinite ± Montmorillonite (Argillic) and Silicified Zones. The mineralization exist are dessiminated Pyrite as ore mineral and oxide mineral such as Hematite which is the alteration of Magnetite and Feromagnesian on temperature conditions < 260oC. Characteristics of deposition types that developed in the study area based on the identification of geology, included alteration and mineralization is low sulphidation epithermal.
Co-Authors Agnis Triahadini, Agnis Agus Setyawan Ainul Fatayatis Salamah Ajidityo Putro Fadhlillah Ajidityo Putro Fadhlillah Alif Febriansyah Alif Febriansyah Andi Kurniawan Anggraeni, Wahyu Dini Arie Noor Rakhman Bagus Zaqqie Betraz A Cita, Akbar Dirostrimila, Najwa Humaira F.X. Yudi Triyono Fachrul Rozi Ramadhan Fadhlillah, Ajiditya Putro fahrudin Fatir Yuslihanu, Fatir Giraldi, Devina Aldalivia Budhi Gregorius Agung Chrishartantyo Hadi Nugroho Hadi Nugroho Herfaes, Bey Anandha Husain, Habib Istiqomah Ari Kusuma, Istiqomah Ari Lutfi Hakim Moechtar, Rio Alcanadre Tanjung Mohammad Tommy Agus Binsar Neli Nikla Iklima Neli Nikla Iklima Nickolas, Syafrichard Ihsan Nurfaizi, Nick Okky Verdiansyah Okky Verdiansyah Perkasa, Leony Isda Prabowo Wahyu Prakosa Rachwibowo Pristiwantoro, Rafa Nurul Zahra Pudjihardjo Henarno Ragil Pratiwi Ragil Pratiwi Rana Lesmana Rana Lesmana Rinal Khaidar Ali Rio Andryantoro Rizal Dwi Febriyana Rizal Dwi Febriyana Rizki Trisna Hutami Santi, Narulita Saumi Rahmawati Saumi Rahmawati Soputan, Puspo Anggreiny Putri Suprapto, Rachdian Eko Thomas Triadi Putranto, Thomas Triadi Tri Winarno Wahju Krisna Hidajat Yasmin, Lutfia Yayan Yuliananto Yoga Aribowo Yoga Aribowo Yosep Purnama Yosep Purnama