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PENENTUAN TIPE ALTERASI BERDASARKAN ANALISIS PETROGRAFI, MINERAGRAFI, DAN GEOKIMIA PADA DAERAH KASIMBAR, KABUPATEN PARIGI MOUTONG, PROVINSI SULAWESI TENGAH Salamah, Ainul Fatayatis; Aribowo, Yoga; Widiarso, Dian Agus; Ali, Rinal Khaidar
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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Hydrothermal alteration is a complex process, because it involves a change in mineralogy, chemistry and texture resulting from the interaction of hydrothermal solutions with rocks in its path on certain physico-chemical conditions (Pirajno, 1992). Hydrothermal processes in certain circumstances will result a collection of certain minerals known as the set of mineral or mineral assemblage (Guilbert and Park, 1986). One evidence of hydrothermal alteration is the appearance of veins that had level of metal minerals and it is also a change on the rock side, as found in Kasimbar District, Moutong Parigi Regency, Central Sulawesi province. In the area discovered the existence of gold in the alluvium sediments that are the result of weathering schist and quartz veining. Gold is found in alluvium sediments are secondary gold or placer gold. From the research that has been done, found gold in quartz veins trapped on phyllite rocks. This study was conducted to determine the lithology of the region, the study based on petrographic analysis, knowing the characteristics of the rock alteration found in the study area based on petrographic analysis mineragraphy, knowing the type of alteration that develops in the area of research, knowing mineralization contained in the study area. Research in Kasimbar District, Parigi Moutong Regency, Central Sulawesi Province was conducted by analyzing rock samples taken from the area. Analysis is conducted with the petrographic analysis, mineragraphy, lithology and geochemistry of the units located in the area.Based on the results of petrographic thin section analysis of rock samples, lithology contained in Kasimbar District, Parigi Moutong Regency, Central Sulawesi Province is phyllite, granite and gneiss. Alteration characteristics of the study area is known of the characteristics quartz veins, alteration minerals characteristics and Â metal minerals characteristics. Quartz veins in the study area was divided into two, namely quartz veins in granite and quartz veins in metamorphic rocks (parallel and cut foliation). Characteristic alteration minerals contained in the study area is chlorite, sericite, biotite, epidote and quartz. Mineralization characteristics of the region, is study of sulphide minerals such as pyrite, bornite, and enargite; iron oxide minerals such as magnetite and hematite and the mineral element in the form of native gold (Au). Type of alteration is developed in the research area of prophylitic alteration, potassic alteration, silicification alteration, and carbonization alteration. Type of mineral deposits research areas is high sulfidation epithermal deposits.

KAJIAN POTENSI BAHAN GALIAN PASIR â KERAKAL DI SUNGAI BARO, KABUPATEN PIDIE, PROVINSI NANGGROE ACEH DARUSSALAM Zaenurrohman, Januar Aziz; Suprapto, Dwiyanto Joko; Fahrudin, Fahrudin
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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The necessity of sand gravel in the development is become larger along with the advance of economic and population growth. Baro river has big enough natural resources in the form of excavated materials such as sand and gravel. Because of that reason, the stock taking of sand and gravel materials is needed in Baro river to serve as reference for the Government about the potential of owned excavated materials. Study about the potential of excavated minerals in Baro river is done in the form of research such as surface geological mapping, geoelectric survey, test pit, measurements of potential spacious and volume, as well as economic analysis. From the above researches, the informations obtained are about the potential area of the minerals, the quality of sand â gravel materials through the laboratory test, and the economical feasibility.In the research location, there are found excavated materials in the form of sand â gravel with the potential area and volume that can be mined appropriated with the government regulation is about 2.997.319,15 m2. The volume of excavated materials is about 14.986.595 m3 with the depth of 5 meters. The result of laboratory test, the grain size is dominated by gravel and sand with the percentage of gravel is about 28,41% up to 66.53%, the percentage of sand is about 33.21% to 71,44%, and the percentage of silt and clay about 0.10% to 0.48%. According to loss angeles abrassion test, the maximum value is 43.70% and minimum value is 38,53%. As well as the results of soundness test, the maximum value is 0,239%, making the aggregate is very resistant to weathering process. In the economical analysis, the result of the NPV >0, BCR > 1, and IRR > MARR with the value about 7.5%, so that mean the location is recommended for mined economically.

ANALISIS KESTABILAN LERENG UNTUK PENANGANAN GERAKAN TANAH DENGAN METODE GROUTING DI PERUMAHAN BUKIT MANYARAN PERMAI (BMP) KOTA SEMARANG Angelo, Yones Lenardo
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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Build an infrastructure must consider the aspects of geology in order to get maximum results. One of the geological aspects that must be considered is the condition of lithology. If the lithology is not sturdy, it will frequently moves or called Â landslide. This land movement can have negative impacts on existing communities in the vicinity.In this study, the author took the theme, slope stability analysis, which is located in Bukit Manyaran Permai Housing (BMP), Semarang. The housing have high intensity of damage due to soil movement. The housing is standing on ground that is dominated by clay. Clay has a low degree of friction angle and low cohesion so it will easilyÂ move if given more weight than the carrying capacity of the lithology.The methodology is using slope stability analysis computionally. The first step of research conducted by geotechnical mapping to determine the distribution of the existing surface lithology and clasify the damage of infrastructure caused by the movement of existing soil. Then drill in two different drill point where each point was drilled to a depth of 10 m. From the drilling results will be obtained samples to be used in laboratory testing, including unit testing and direct shear weight. From bothÂ test, theÂ results will be obtained areÂ the value of the unit weight, cohesion and friction angle Â which we can use for making modeling and computational search for the safety factor. In doing modeling and find the value of the safety factor of the location of the study authors using Slide 6.0 software which is very helpful in determining the value of the safety factor on the ground.From the computational analysis found that is worth the value of the safety factor of less than 1.5, it indicates the condition of the slopes of the potential occurrence of landslide. Therefore, at the end of this final report the authors provide proper recommendations Â handling of landslide in accordance with the results of laboratory analysis and the existing conditions in the field.

KAJIAN DAERAH RAWAN BENCANA ALAM GERAKAN TANAH BERDASARKAN ANALISIS FAKTOR PENGONTROL DI WILAYAH KECAMATAN CILONGOK, KABUPATEN BANYUMAS, JAWA TENGAH Kusumayadi, Henri; Rachwibowo, Prakosa; Hidajat, Wahju Krisna
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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Kecamatan Cilongok merupakan salah satu kecamatan di Kabupaten Banyumas yang berada di lereng selatan Gunung Slamet. Kecamatan ini memiliki Â daerah-daerah rawan bencana alam gerakan tanah yang dikontrol oleh faktor kondisi geologi (litologi), kemiringan lereng, dan tata guna lahan. Tujuan penelitian ini yaitu untuk mengetahui zona kerentanan gerakan tanah dan mengetahui cara untuk mengurangi gerakan tanah. Metode penelitian meliputi pengamatan lapangan yang dilanjutkan dengan metode analisis.Pengamatan lapangan meliputi pemetaan lokasi gerakan tanah dan pemetaan faktor-faktor penyebab gerakan tanah (litologi, kelerengan, dan tata guna lahan). Setelah melakukan pengamatan lapangan, data lapangan dianalisis sehingga menghasilkan peta geologi, peta kelerengan, peta tata guna lahan. Kemudian analisis dilanjutkan dengan melakukan pembobotan faktor-faktor pengontrol gerakan tanah dilakukan sehingga menghasilkan nilai bobot setiap faktor pengontrol.Â Langkah selanjutnya yaitu menumpangtindihkan (overlaying) ketiga peta faktor pengontrol (dengan nilai bobot masing-masing) sehingga menghasilkan peta tingkat kerentanan gerakan tanah.Berdasarkan peta tingkat kerentanan gerakan tanah, Kecamatan Cilongok dapat dibagi menjadi tiga zona tingkat kerentanan gerakan tanah, yaitu zona tingkat kerentanan tinggi (luas mencakup + 35% peta), zona tingkat kerentanan sedang (luas mencakup + 15% peta), dan zona tingkat kerentanan rendah (luas mencakup + 50% peta). Peta zona tingkat kerentanan gerakan tanah dapat digunakan untuk skala prioritas mitigasi bencana alam gerakan tanah berdasarkan zona tingkat kerentanan. Untuk mengendalikan gerakan tanah, dapat dilakukan tindakan yang tepat berdasarkan faktor pengontrol gerakan tanah di masing-masing daerah.

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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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-chloriteÂ±quartzÂ±carbonate-pyrite replacement-infill strong intensity and alteration facies of chloriteÂ±epidoteÂ±sericiteÂ±quartzÂ±carbonate-pyrite replacement-infill moderate-strong intensity. Gold deposition mineralization (Au) in the research area predominantly formed on quartzÂ±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 Â°C - 225 Â°C.

KAJIAN GEOLOGI TATA LINGKUNGAN DAERAH RESAPAN AIR STUDI KASUS DAERAH KECAMATAN UNGARAN BARAT, KABUPATEN SEMARANG, PROVINSI JAWA TENGAH Geni Dipo Sudarmo
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Setiap manusia membutuhkan tempat tinggal untuk hidup dan terus berkembang. Perkembangan dan kebutuhan manusia ini akan menimbulkan multi player effect. Multi player effect merupakan konflik antara manusia dengan lingkungannya termasuk lahan yang ditempati dan kebutuhan airnya. Hal tersebut dapat mempengaruhi tataguna lahan lingkungan yang ditempati dan juga merubah fungsi lahan sebagai daerah resapan air. Daerah resapan air merupakan kawasan lindung yang diatur dalam Keputusan Menteri Negara Lingkungan Hidup No.39/MENLH/8/1996. Menurut Perda Kabupaten Semarang No. 6 Tahun 2011 pada pasal 23 menyebutkan kawasan lindung meliputi kawasan hutan lindung, kawasan yang memberikan perlindungan terhadap kawasan bawahannya, kawasan perlindungan setempat, kawasan suaka alam, pelestarian alam dan cagar budaya, kawasan rawan bencana alam dan kawasan lindung geologi. Sementara Pasal 25 menyebutkan bahwa Kawasan yang memberi perlindungan terhadap kawasan bawahannya adalah kawasan resapan air dimana Kecamatan Ungaran Barat termasuk daerah resapan air. Dasar pemilihan kecamatan ini dikarenakan memiliki kepadatan penduduk yang tinggi daripada daerah resapan air lainnya. Tujuan dari penelitian ini untuk mengetahui sebaran wilayah yang menjadi daerah resapan air, perubahan lahan daerah resapan air dan kelayakan wilayah penelitian sebagai daerah resapan air dengan menggunakan metode overlay dan pembobotan pada masing - masing parameter penelitian, sehingga dapat diketahui wilayah sebaran daerah resapan airnya. Parameter yang dijadikan acuan dalam mengkaji daerah resapan ini adalah ketinggian lahan > 1500 mdpl, kemiringan lahan > 40%, penggunaan lahan sebagai hutan dan ruang terbuka hijau, curah hujan >2000mm/tahun, lahan peka atau sangat peka terhadap erosi. Dari hasil pembobotan dan skoring parameter ketinggian lahan, kelerengan dan penggunaan lahan, menghasilkan zona - zona parameter yang kemudian dilakukan overlay pada zona tersebut. Kemudian didapatkan wilayah yang menjadi daerah resapan air adalah Barat daya daerah penelitian, merupakan kaki Gunung Ungaran, tepatnya sebagian daerah Desa Nyatnyono, Desa Gogik dan Desa Lerep.

STUDI PENDAHULUAN DAERAH PROSPEK PANASBUMI BERDASARKAN DATA MANIFESTASI PANASBUMI, GEOKIMIA DAN ISOTOP FLUIDA PANASBUMI KOMPLEK GUNUNG TELOMOYO, KABUPATEN SEMARANG, JAWA TENGAH Rizki Trisna Hutami; 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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Telomoyo Mountain (area) is one of geothermal prospect area in Indonesia which is shown by many geothermal manifestations around the mountain. Telomoyo Mountain (area) is located in two regencies, Semarang and Magelang, Central Java. The purpose of this study is to get vision about geothermal model system in Telomoyo Mountain based on geothermal manifestation data, geothermal fluid geochemistry, and geothermal fluid isotope.Based on manifestation mapping there are two kinds of manifestation, warm spring and alteration. Warm springs are spread in Candi Dukuh and Candi Umbul with neutral pH characteristic and 36oC water temperature. Based on fluid geochemistry analysis the type of fluid is chloride-bicarbonate water, and based on Na-K-Mg comparison the fluid is immature water. Based on isotope 18O and 2H analysis, warm spring has mixed with meteoric water. Altered rocks are found in Desa Dangkel, Desa keningar, Desa Sepakung, and Desa Kendal Duwur with the type of alteration is argillic – advanced argillic. Based on petrography analysis, lithology in this area are andesitic lava, tuff breccia, and pyroclastic breccia. Based on XRD analysis, altered minerals in rock which is argillic type are smectite, halloysite, kaolinite, and jarosite. In rock which has advanced argilic type, there are dickite, phyrophillite, alunite, diaspora, cristobalite, and pyrite. Dickite and alunite mineral are typical mineral for physicochemical environment with acid in pH and 230 – 260 oC in temperature. Candi Umbul and Candi Dukuh warm spring shows the lateral outflow zone of the geothermal system, while advanced argillic alteration shows the upflow zone of geothermal system.

PEMODELAN PEMASANGAN PENYANGGA SEMENTARA MENGGUNAKAN PERANGKAT LUNAK PHASE 2 PADA HEADRACE TUNNEL CHAINAGE 265 M – 375 M DI PLTA TULIS KABUPATEN BANJARNEGARA, JAWA TENGAH Lulu Febri Nugraha
Geological Engineering E-Journal Vol 5, No 1 (2013): Volume 5, Nomor 1, Tahun 2013
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Implementation of development Hydroelectric Power Plant (HEPP) Write a dam will be constructed of concrete type dam times Write Banjarnegara district. Water from the dam Write dams planned for suplesi plan Maung, by creating a tunnel from the dam Write Merawu towards Kali. Water from the tunnel entrance on the upstream dam plan Maung. Before the water reached the Kali Merawu, formerly used as power plant turbines. So the head race tunnel tunnel work. Making the tunnel is strongly influenced by the mass of rock above the tunnel or overburden. Modeling research purposes pit tunnel condition before reinstalling the system buffer and temporary buffer on the tunnel design using Phase2 software so that it can determine the type most suitable buffer while the tunnel chainage chainage 306 m and 347 m The method used in this study with experimental methods. Using the help of Phase2 software to help model some temporary buffer to buffer variations in the form of bolts while concrete and benton shoot. Determining whether or not the buffer is safe while the results of the use value of the total displacement, and finite element. From the use of one of these parameters the total displacement (total collapse), there is a scale from chainage 306 m and 347 m chainage have total displacement 0.0222129 and 0.0165611 m m. Of the total displacement that there are more than 0.005 m, then at chainage 306 m and 347 m chainage unsafe and finite element number is less than 4 then the class of models Masaa rocks found on the chainage is less than 4 including unsafe. Type of buffer used in the form of concrete shot but shows the total value of less than 0.005 m dispalcement then coupled with the type of buffer while steel. Modeling is done in class IIIa and IIIb rock mass unsafe. It is necessary to increase the zone of concrete screws are indicated collapse. Zones are shown by the broken keterdapatan finite element.

PEMETAAN GERAKANTANAH DAN ANALISIS KESTABILAN LERENG DESA GONDANGLEGI, KECAMATAN KLEGO, KABUPATEN BOYOLALI, JAWA TENGAH Fakhlove Wardhani; Dwiyanto Joko Suprapto; Wahju Krisna Hidajat; Citra Ningtyas
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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Massmovement disaster is very harmful, because it can damage various infrastructure facilities. Gondanglegi villages, subdistricts Klego, Boyolali district, Central Java, an area that suffered massmovement was quite severe in recent years.To find out how prevention of landslides in the study location so that need to do geotechnical investigations surface and subsurface. Surface investigations conducted by geotechnical mapping aimed to find out surface conditions that include geotechnical conditions and the direction of ground motion distribution / landslides. While subsurface investigation conducted by using data from the PT . Selimut Bumi Adhi Cipta form of with core drilling to a depth of 15 meters data which then laboratory testing, and also geoelectric investigation data.From the data results of the investigation like slope geometry, subsurface cross-section, the interpretation of landslide areas and mechanical properties of soil/ rock material slope stability analysis that using softwares like Slide version 8.0 and Phase ver 8.0.Based on the results of the slope stability analysis, slope conditions around the cross-section AA' and BB' classified as unsafe have a safety factor value ( Fs ) of 0.851 to 1.031. And the area around the cross-section CC' is safe, with a factor of safety value ( FS ) at 4.33Type of massmovement that occurs at the study location in the form is rotational slides with a speed that is classified as moderate massmovement caused by high levels of steepness of slopes and thick weathering materials and triggered by rainfall and human activities.Alternative of prevention to do is cut off the top of the slope, cut down slope, installing gabion stone, make some retaining walls and grouting.

EVALUASI DESAIN TAHAP 1 DISPOSAL SWD 11 PIT 116 TAMBANG BATUBARA DISTRIK BAYA DESA SEPARI, KECAMATAN TENGGARONG SEBERANG, KABUPATEN KUTAI KARTANEGARA, KALIMANTAN TIMUR Roni Cahya Kusuma
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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Kegiatan eksploitasi batubara dengan sistem penambangan terbuka melakukan kegiatan pengambilan batubara dan batuan yang tidak digunakan seperti material overburden dan interburden. Kemudian, material yang tidak digunakan tersebut ditimbun kembali di disposal. Pembuatan disposal harus dilakukan dengan baik, apabila tidak, akan timbul adanya tanah longsor yang akan mengganggu aktivitas eksploitasi batubara. Selain itu pembuatan disposal harus mencukupi target kapasitas timbunan.Penelitian tugas akhir ini bermaksud untuk menganalisis kestabilan lereng, mengevaluasi, dan melakukan perhitungan kapasitas desain awal dan desain baru (redesign) disposal SWD 11 yang terletak di site Baya, Kalimantan Timur. Metode yang dilakukan adalah penyelidikan langsung lapangan yang bersifat deskriptif ke disposal SWD 11 untuk mengetahui geometri lereng serta tipe longsoran dan kegiatan laboratorium untuk mengetahui bobot isi (g), kohesi (c) serta sudut geser (f) dalam timbunan tanah pada disposal NED 2 sebagai acuan. Analisis kestabilan lereng unuk menentukan nilai faktor keamanan dari lereng disposal. Metode analisis kestabilan lereng menggunakan metode Bishop simplified dan Janbu simplified. Analisis kestabilan dan permodelan lereng disposal menggunakan bantuan perangkat lunak Slide 6.0 serta permodelan desain disposal menggunakan perangkat lunak AutoCad dan Minescape.Berdasarkan hasil evaluasi desain awal disposal SWD 11 memiliki nilai faktor keamanan £ 1,2 sehingga termasuk kedalam kondisi tidak aman. Untuk menghasilkan nilai faktor keamanan ³ 1,2 perlu adanya konstruksi counter weight pada kaki lereng disposal, serta untuk mengoptimalkan kapasitas disposal dilakukan penggeseran timbunan dan counter weight menjauhi kolam lumpur (sump) dan mengubah lereng tunggal timbunan disposal dari 37° menjadi 40°. Kapasitas disposal SWD 11 mengalami peningkatan sebesar 1.016.342,3 ton atau setara dengan peningkatan 5% setelah dilakukan perubahan menjadi desain baru. Pengaruh parameter sifat fisik dan mekanik tanah yang mempengaruhi kestabilan lereng disposal SWD 11 antaralain unit weight (γ), kohesi (c), sudut geser dalam (f). Semakin besar nilai unit weight (γ) maka nilai faktor keamanan mengalami penurunan rata-rata 4,4%, semakin besar nilai kohesi (c) maka nilai faktor keamanan mengalami kenaikan rata-rata 8,4%, semakin besar sudut geser dalam (f) maka nilai faktor keamanan mengalami kenaikan rata-rata 15,3%.

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