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Gold mineralization in the Neo-Tectonic Region of Honje Formation and Cipacar Formation Usman, Dudi Nasrudin; Sulaksana, Nana; Hirnawan, Febri; Haryanto, Iyan
Journal of Geoscience, Engineering, Environment, and Technology Vol 3 No 4 (2018): JGEET Vol 03 No 04 : December (2018)
Publisher : UIR PRESS

The gold ore mineralization region is a zone of mineralization which is inseparable from the role of geological structures, one of which is fracture. The Cibaliung and surrounding areas are epithermal gold mineralization zones, in this region there are two main mineralized zones, namely Cibitung Zone and Cikoneng Zone. It has almost the same characteristics where the fractures formed are quite large so that it influences the class of rock mass, but the other side is the presence of many fractures which make it easier for scattered mineralization to fill the fracture so that the formed vein is thick enough. This study aims to analyze the relationship of Rock Mass Rating (RMR) and Rocks Quality Design (RQD) to tectonic movements in the region to prove the neo-tectonic phenomena in the Honje Formation and Cipacar Formation using surface mapping methods. The methods used are rock type mapping, rock structure mapping, mapping and RQD measurements, rock descriptions and rock sample collection. All the data obtained are then verified and validated before processing and statistical tests. Statistical tests are carried out to ensure an analysis with a basis that is recognized by all parties. Both formations above have different ages, which is for the Honje Formation (Andesite Lava) with the final Miocene age and Cipacar Formation (tuff) at the age of Pleistocene. The findings of this study are the two formations measured by RQD and RMR on rock cracks and surrounding conditions; the RMR observation station made around 125 points in the Honje Formation and 117 points in the Cipacar Formation. The R2 value of the RMR value of the Honje Formation and the Cipacar Formation shows a positive relationship of 67%; The biggest RMR value is in Tuff rock. In addition, the relation between RMR Andesite Lava Value and RMR Tuff Value is done with T-Test between Andesite Lava and Tuff where the result shows no difference of mean between RMR Andesite Lava and RMR Tuff Value. Therefore, the tectonic processes that occur in the Honor Andesite Lava Unit of Honje Formation with the preceding position are formed, and the older age at the end of the Miocene age that is blocked by the field of unconformity experienced Continuity on Cipacar Formation Tuff Unit with the upper position that is formed after Honje Formation and younger age in Pleistocene. The continuation of the tectonic process proves the existence of active tectonic activity better known as Neo-tectonic.

Gold mineralization in the Neo-Tectonic Region of Honje Formation and Cipacar Formation Dudi Nasrudin Usman; Nana Sulaksana; Febri Hirnawan; Iyan Haryanto
Journal of Geoscience, Engineering, Environment, and Technology Vol. 3 No. 4 (2018): JGEET Vol 03 No 04 : December (2018)
Publisher : UIR PRESS

The gold ore mineralization region is a zone of mineralization which is inseparable from the role of geological structures, one of which is fracture. The Cibaliung and surrounding areas are epithermal gold mineralization zones, in this region there are two main mineralized zones, namely Cibitung Zone and Cikoneng Zone. It has almost the same characteristics where the fractures formed are quite large so that it influences the class of rock mass, but the other side is the presence of many fractures which make it easier for scattered mineralization to fill the fracture so that the formed vein is thick enough. This study aims to analyze the relationship of Rock Mass Rating (RMR) and Rocks Quality Design (RQD) to tectonic movements in the region to prove the neo-tectonic phenomena in the Honje Formation and Cipacar Formation using surface mapping methods. The methods used are rock type mapping, rock structure mapping, mapping and RQD measurements, rock descriptions and rock sample collection. All the data obtained are then verified and validated before processing and statistical tests. Statistical tests are carried out to ensure an analysis with a basis that is recognized by all parties. Both formations above have different ages, which is for the Honje Formation (Andesite Lava) with the final Miocene age and Cipacar Formation (tuff) at the age of Pleistocene. The findings of this study are the two formations measured by RQD and RMR on rock cracks and surrounding conditions; the RMR observation station made around 125 points in the Honje Formation and 117 points in the Cipacar Formation. The R2 value of the RMR value of the Honje Formation and the Cipacar Formation shows a positive relationship of 67%; The biggest RMR value is in Tuff rock. In addition, the relation between RMR Andesite Lava Value and RMR Tuff Value is done with T-Test between Andesite Lava and Tuff where the result shows no difference of mean between RMR Andesite Lava and RMR Tuff Value. Therefore, the tectonic processes that occur in the Honor Andesite Lava Unit of Honje Formation with the preceding position are formed, and the older age at the end of the Miocene age that is blocked by the field of unconformity experienced Continuity on Cipacar Formation Tuff Unit with the upper position that is formed after Honje Formation and younger age in Pleistocene. The continuation of the tectonic process proves the existence of active tectonic activity better known as Neo-tectonic.

Rock Formation Acid Mine Drainage in Epithermal Gold Mineralization, Pandeglang, Banten Province Dudi Nasrudin Usman; Sri Widayati; Sriyanti Sriyanti; Era Setiawan
Journal of Geoscience, Engineering, Environment, and Technology Vol. 4 No. 4 (2019): JGEET Vol 04 No 04: December 2019
Publisher : UIR PRESS

Mine acid water is acidic water and contains iron and sulfate, which is formed under natural conditions when geological strata containing pyrites are exposed to an oxidizing atmosphere or environment. One of the impacts of the mineralization zone where there is a mining process is the potential for the formation of acid mine drainage, especially in the Cibaliung gold mineralization area and its surroundings, Pandeglang Regency, Banten Province. Acid-forming sulfide minerals include pyrite (FeS2), headquarters (FeS2), picoliters (FexSx), calcocytes (CuS), covellite (CuS), chalcopyrite (CuFeS2), molybdenite (MoS), mulenite (NiS), chalocytes (CuS), covellite (CuS), chalcopyrite (CuFeS2), molybdenite (MoS), mulenite (NiS), chalocytes (CuS), covellite (CuS), chalcopyrite (CuFeS2), molybdenite (MoS), mulenite (NiS), galena (PbS) ) and sphalerite (ZnS). Of all these minerals, pyrite is the most dominant sulfide in acid formation. Alkaline mine water (alkaline mine drainage) is mine water that has an acidity level (pH) of 6 or more, containing alkalinity but still containing dissolved metals that can produce acids. The quality of mine water, acid or alkali, depends on the presence or absence of acid mineral content (sulfides) and alkaline materials in the geological strata. Acid water formation tends to be more intensive in mining areas. This can be prevented by avoiding exposure to sulfide-containing materials in the free air. Acid-forming sulfide minerals include pyrite (FeS2), headquarters (FeS2), picoliters (FexSx), calcocytes (CuS), covellite (CuS), chalcopyrite (CuFeS2), molybdenite (MoS), mulenite (NiS), chalocytes (CuS), covellite (CuS), chalcopyrite (CuFeS2), molybdenite (MoS), mulenite (NiS), chalocytes (CuS), covellite (CuS), chalcopyrite (CuFeS2), molybdenite (MoS), mulenite (NiS), galena (PbS) ) and sphalerite (ZnS). Of all these minerals, pyrite is the most dominant sulfide in acid formation. Formation of potential acidic water also occurs in tailings which are residues/processing residues containing sulfide minerals. The formation of acid mine drainage does not always develop in every sulfide-ore mining. In certain types of ore deposits, there are neutralizing agents which prevent the formation of acid mine drainage.

Pola Deformasi (Deformation Pattern) Mineralisasi Emas Sulfida Rendah di Zona Neo-Tektonik Selat Sunda Dudi Nasrudin Usman; Nana Sulaksana; Febri Hirnawan; Iyan Haryanto
PROMINE Vol 6 No 1 (2018): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

The Sunda Strait is one of the zones of the Eurasian plate encounters with fairly active Indian plates. This can be seen based on volcanic activity that occurred in the region of Mount Krakatau. But there are unique things that are important to learn is tectonic movement with geological forces that work to produce cracks in rocks, the formation of volcanoes and cracks that occur produce mineralized zones, especially in the Formation of Honje and Formation Cipacar and more widely known as Bayah Dome. The presence of mineralization of the Honje Formation and Cipacar Formation is particularly located in the District of Cimanggu, Mangku Alam Village, the existence of gold mining activities proves that the mineralization of the region has the potential of economy. The presence of mineralization will not be separated from the presence of rock fractures in the two formations that have different geological age of the Late Miocene and Plistocene. Both formations are hindered by the presence of unconformity fields. This study aims to prove the extent of tectonic activity occurring in the Honje Formation with the final Miocene age forwarded to the Cipacar Formation even though obstructed by the field of nonconformity with the results of field data processing based on the value of RMR and RQD value. Both parameters are also studied to determine the extent to which the RQD value determines the magnitude of the grade value of Gold (Au). The distribution of RMR value and rock RQD value is taken from 2 different rock units, ie, andesite rock units in Honje Formation and tuff rock units in Cipacar Formation, based on the data distribution around 125 RMR observation points and 117 RQD observation points in the field are processed by using method test the average difference of the two parameters from 2 different rock units. In addition, the RQD value was correlated to the high level of gold content using correlation regression test of 78 data content and RQD value. Results of processing and discussion of data indicate that between the value of RMR in andesit unit and tuff unit there is no difference in value means H0 accepted by tcount = 0.556 <ttable = 1.995, as well as the difference test average RQD value where the results show that there is no difference between the average value of RQD andesite rock units in Honje Formation and tuff rock units in Cipacar Formation with tcount = 1.714 <ttable = 1.995, based on the results of data processing it can be explained that the tectonic activity in Honje Formation with the final Miocene age is forwarded to Cipacar Formation even if obstructed the field of dissonance means that tectonic activity of the region is inferred as neotectonic activity of West Java. In addition, one more thing that can be concluded that the relationship of RQD with Gold content (Au) based on statistical test the greater the value of RQD then the value of gold content (Au) the greater the test results regression correlation value PValue (Significance) = 0.013 with the equation y = -0.715x + 75.882 value R2 42.39%. Because Significance value> 0.05 then H0 DENIED, so H1 accepted, where the higher the value of the Big Au content then the RQD Value the greater.

Pengembangan Wilayah untuk Pembangunan Daerah Pangalengan Kabupaten Bandung Berbasis pada Satuan Genetik Wilayah Geologi dan Kebencanaan Dudi Nasrudin Usman; Sri Widayati; Sriyanti Sriyanti
PROMINE Vol 5 No 2 (2017): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

Unit of Area Genetics (SGW) as one of the methods in considering geological aspects for geologicarea-based development. The geological condition as part of the natural movement in a particularcondition makes it possible to predict its effect on the movement of an area in particular with regard tonatural disasters. Pangalengan who has a million beautiful natural charm, especially from the point ofpan-dang geology need it to be studied based on geological data. The charm is the presence of activevolcanoes in the region such as Mount Malabar, Mount Wayang, Mount Windu and others. In addition,the morphology of Pangalengan is relatively well represented in the highlands, hills and mountainareas as part of Java's tectonic activity. Another evidence of such activity is the existence of fault linesin the Pan-galengan mountains of Southeast-Northwest. Pangalengan who has a million beautifulnatural charm, especially from the point of pan-dang geology need it to be studied based on geologicaldata. The charm is the presence of active volcanoes in the region such as Mount Malabar, MountWayang, Mount Windu and others. In addition, the morphology of Pangalengan is relatively wellrepresented in the highlands, hills and mountain areas as part of Java's tectonic activity. Anotherevidence of such activity is the existence of fault lines in the Pan-galengan mountains of Southeast-Northwest.

Karakteristik Endapan Tras Nagreg untuk Menudukung Pemberdayaan Perekonomian Masyarakat Lokal, Desa Nagreg Kendan, Kecamatan Nagreg, Kabupaten Bandung Sri Widayati; Dudi nasrudin usman; Sriyanti Sriyanti; Linda Pulungan; Dono Guntoro
PROMINE Vol 5 No 2 (2017): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

Characteristics of sediment Tras Nagreg as part of the volcanic process in the region provides anopportunity and potential to be utilized through mining activities. Mining activities, as a capitalintensive,labor-intensive and risk-filled industry, do not always have a negative impact on thesurrounding community, there is something to do with the economic aspects in which all types ofmineral deposits have economic value including tras. Nagreg Kendan Village, Nagreg Subdistrict aspart of Bandung Regency which has tras sediment potential, where in quality and quantity, trassediment in the area has big enough potency to be utilized especially to improve prosperity of localcommunity. Currently, the number of people with productive age is quite a lot, which becomes thecapital for the management of tras going forward, another thing to consider is the existence of thelocation not far from the access road that connects Bandung - Garut, Bandung - Cianjur and Bandung- Jakarta.

Peningkatan Kompetensi Masyarakat Lokal dalam Pemanfaatan Endapan Tras Di Daerah Nagreg Kendan, Kabupaten Bandung, Jawa Barat Sri Widayati; Dudi nasrudin Usman; Sriyanti Sriyanti; HimawaN Nuryahya; Ike J. Triwardhani
PROMINE Vol 7 No 2 (2019): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/promine.v7i2.1644

Competency enhancement in trass utilization was given to local communities of Nagreg Kendan,Bandung, West Java. This activity was intended to explore the potential of local cummunity indeveloping trass deposit utilization for local economy. This activity is expected to providerecommendation and encouragement for local community to develop entrepreneurship in utilizing andmanaging mineral resources potential. This activity was divided into several parts, they are pre-test,counseling and discussion about trass utilization, and also post-test to evaluate local community’sbasic knowledge. Local community shows good knowledge and enthusiasm of local community indeveloping local economy through trass utilization.

Rancangan Teknis Penambangan Bijih Nikel pada Daerah Blok C PT XYZ Desa Boenaga, Kecamatan Lasolo, Kabupaten Konawe Utara, Provinsi Sulawesi Tenggara Adit Kurniawan; Dudi Nasrudin; Rully Nurhasan
Jurnal Riset Teknik Pertambangan Volume 1, No. 2, Desember 2021, Jurnal Riset Teknik Pertambangan (JRTP)
Publisher : UPT Publikasi Ilmiah Unisba

Abstract. Planning and design are important things in mining activities because they are used as technical requirements and technical sequences for the purposes and objectives of mining activities. The purpose of this research activity is to determine the technical design of nickel ore mining activities at the mining stage and production scheduling obtained based on exploration data and in accordance with mining design parameters such as Cut off Grade, Stripping Ratio and Geometry Grades and mining roads. Before the design is carried out, it is necessary to know the sediment distribution model, and first. Sediment modeling and estimation of nickel ore resources used is by making block models using the inverse distance method to describe the distribution of the levels. The result of calculations using the block model is that the measured resource is 142,400 tons with an average Ni content of 1.8%. The mine design was made by based on the Cut Off Grade value used, average Ni 1.6% and the Stripping Ratio value of 6,7 tonnes of waste / tonnes of ore with a geometric level with a height of 6 m and a slope of 40o. The road geometry used is a straight road width of 9 m with a cross slope of 1.71o and a curved road width of 17 m. From this limitation, it is obtained a mining limit of 8,3 hectares with the mining method to be used, namely the side cast method. Based on the mine opening design, the production of mined reserves is 137,000 tons of nickel with an average grade of 1,86% and 834,118 tons of waste to be peeled, resulting in a stripping ratio of 6.49 tons of waste / ton of ore with a company target of 40,000 tons / month, so mining will planned for 3 months. Abstrak. Perencanaan dan perancangan merupakan hal penting dalam kegiatan penambangan karena dijadikan sebagai persyaratan teknik serta urutan teknis untuk pencapaian tujuan dan sasaran kegiatan penambangan. Tujuan dari kegiatan penelitian ini yaitu untuk mengetahui rancangan teknis kegiatan penambangan bijih nikel terutama tahapan penambangan dan penjadwalan produksi yang diperoleh berdasarkan data hasil eksplorasi dan sesuai dengan parameter rancangan penambangan seperti Cut off Grade, Stripping Ratio serta Geometri Jenjang dan jalan tambang. Sebelum dilakukan perancangan maka perlu diketahui model sebaran endapan, kadar dan sumberdaya. Pemodelan endapan dan penaksiran sumberdaya bijih nikel yang digunakan yaitu dengan pembuatan blok model dengan menggunakan metode inverse distance untuk menggambarkan sebaran kadarnya. Hasil perhitungan dengan menggunakan blok model yaitu diperoleh sumberdaya terukur sebesar 142,400 ton dengan kadar rata-rata Ni 1,8%. Rancangan bukaan tambang dibuat berdasarkan nilai Cut Off Grade yang digunakan yaitu Ni rata-rata 1.6 % dan nilai Stripping Ratio sebesar 6,7 ton waste/ton ore dengan geometri jenjang dengan tinggi 6 m dan kemiringan 40°. Geometri jalan yang digunakan yaitu lebar jalan lurus 9 m dengan nilai cross slope 1,71° dan lebar jalan tikungan 17 m. Dari batasan tersebut maka diperoleh batas penambangan seluas 8,3 Ha dengan metode penambangan yang akan digunakan yaitu metode side cast. Berdasarkan rancangan bukaan tambang, diperoleh cadangan tertambang sebesar 137,000 Ton nikel dengan kadar rata – rata 1,86 % dan 834,118 ton waste yang akan dikupas, menghasilkan stripping ratio 6,49 ton waste/ton ore dengan target produksi perusahaan sebesar 40,000 ton/bulan, sehingga penambangan akan direncanakan selama 3 bulan.

Analisis Kualitas Batubara Berdasarkan Korelasi Nilai HGI, Moisture Content, dan Volatile Matter Ilya Rahma Putri; Dudi Nasrudin Usman
Jurnal Riset Teknik Pertambangan Volume 2, No. 1, Juli 2022, Jurnal Riset Teknik Pertambangan (JRTP)
Publisher : UPT Publikasi Ilmiah Unisba

Abstract. Coal is generally used as a basic energy source for several industries. In this study, the data obtained from the results of laboratory tests are the value of Moisture Content, Volatile Matter, and HGI values, these three data are indicated to be related/related to each other in determining coal rank, for this reason, a data correlation test was carried out. The calorific value of the coal sample that has been tested is 5,837 cal/gr or 10,506.6 BTU/lb when referring to the ASTM D 388–12 standard. The calorific value of this coal sample indicates that the coal sample tested can be classified into Sub-bituminous coal class A. The results of the calculation of data normality using the Liliefors Test method show that the resulting Lo value meets the requirements for the acceptance of the H0 hypothesis, so it can be concluded that the three data variables are data variables with normal distribution. The results of the calculation of the correlation of the data indicate that the value of rcount does not meet the criteria for accepting hypothesis H0. So it can be concluded that there is no positive and significant relationship between the variables of Total Moisture, Volatile Matter, and HGI values. Abstrak. Batubara umumnya dimanfaatkan sebagai sumber energi pokok untuk beberapa industri. Pada penelitian ini, data yang diperoleh dari hasil uji laboratorium adalah nilai Moisture Content, Volatile Matter, dan nilai HGI, ketiga data ini diindikasikan saling berkaitan/berhubungan satu sama lainnya dalam menentukan peringkat batubara, untuk itu dilakukan uji korelasi data. Nilai kalori sampel batubara yang telah diuji yaitu sebesar 5.837 cal/gr atau 10.506,6 btu/lb jika mengacu pada standar ASTM D 388–12 nilai kalori sampel batubara ini menunjukkan bahwa sampel batubara yang diuji dapat diklasifikasikan ke dalam kelas batubara Sub-bituminous A. Hasil perhitungan normalitas data menggunakan metode Uji Liliefors menunjukkan nilai Lo yang dihasilkan memenuhi syarat diterimanya hipotesis H0 sehingga dapat disimpulkan bahwa ketiga variabel data merupakan variabel data yang berdistribusi Normal. Hasil perhitungan korelasi data menunjukkan bahwa nilai rhitung tidak memenuhi kriteria diterimanya hipotesis H0. Sehingga dapat disimpulkan bahwa tidak terdapat hubungan yang positif dan signifikan antara variabel kandungan Total Moisture, Volatile Matter, dan Nilai HGI.

Analisis Risiko Bencana Longsor dan Kerugiannya Kecamatan Cililin Kabupaten Bandung Barat Yuti Andila Aninditya; Yulia Asyiawati; Dudi Nasrudin Usman
Bandung Conference Series: Urban & Regional Planning Vol. 2 No. 1 (2022): Bandung Conference Series: Urban & Regional Planning
Publisher : UNISBA Press

Abstract. Disaster Management Agency in West Bandung Regency, 5 sub-districts in the southern region of West Bandung Regency have a fairly high vulnerability to landslides, one of which is Cililin District. Based on the West Bandung Regency Disaster Risk Study Document in 2017-2021, Cililin District has a hazard with high parameters and an area of 3,790 Ha. Because this landslide disaster will cause losses. There are 5 threats that cause landslides, namely slope, rainfall, soil type, rock type, overflow. Capacity is the potential possessed by individuals and communities that are used to be able to prevent, and recover from disaster emergencies. Vulnerability is the potential for damage or loss, which is related to the capacity to anticipate a hazard. This disaster risk is used to find out how big the impact of the risk is. The highest threat is in Mukapayung Village. The highest vulnerability is in Mukapayung Village, Rancapanggung Village, Bongas Village, Batulayang Village and Cililin Village. Capacity has a low capacity class. The highest risk areas are Mukapayung Village, Bongas Village, and Batulayang Village. The highest risk areas are Mukapayung Village, Bongas Village, and Batulayang Village. The total loss as a whole is Rp. 2,570,000,000. Mukapayung Village has a high threat due to the extensive jungle and shrubs. Cililin District has a high total disaster vulnerability in Mukapayung Village, Rancapanggung Village, Bongas Village, Batulayang Village and Cililin Village. For its own capacity, it has a low capacity class. Abstrak. Badan Penanggulangan Bencana di Kabupaten Bandung Barat, 5 kecamatan pada wilayah selatan Kabupaten Bandung Barat memiliki kerawanan cukup tinggi terhadap longsor salah satunya adalah Kecamatan Cililin. Berdasarkan Dokumen Kajian Risiko Bencana Kabupaten Bandung Barat Tahun 2017-2021 Kecamatan Cililin memiliki bahaya dengan parameter yang tinggi dan luasnya 3,790 Ha dan bencana longsor ini akan menimbulkan kerugian yang terjadi. Ada 5 ancaman yang menyebabkan longsor yaitu kemiringan, curah hujan, jenis tanah, jenis batuan, tuplah. Kapasitas adalah potensi yang dimiliki oleh perorangan, dan masyarakat yang digunakan untuk mampu mencegah, serta memulihkan dari keadaan darurat bencana. Kerentanan adalah potensi tertimpa kerusakan atau kerugian, yang berkaitan dengan kapasitas untuk mengantisipasi suatu bahaya. Risiko bencana ini digunakan agar mengetahui seberapa besar dampak resiko. Ancaman yang paling tinggi berada di Desa Mukapayung. Kerentanan yang paling tinggi berada pada Desa Mukapayung, Desa Rancapanggung, Desa Bongas, Desa Batulayang dan Desa Cililin. Kapasitas memiliki kelas kapasitas yang rendah. Risiko Tinggi berada paling Desa Mukapayung, Desa Bongas, dan Desa Batulayang.Risiko Tinggi berada paling Desa Mukapayung, Desa Bongas, dan Desa Batulayang. Total kerugian secara keseluruhan adalah Rp. 2.570.000.000. Desa Mukapayung memiliki ancaman yang tinggi disebabkan oleh luas hutan rimba dan semak belukar. Kecamatan Cililin memiliki kerentanan total bencana yang tinggi Desa Mukapayung, Desa Rancapanggung, Desa Bongas, Desa Batulayang dan Desa Cililin. Untuk kapasitas sendiri memiliki kelas kapasitas yang rendah).

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