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Underground mining of Shallow-Dipping Orebodies in Australia - Mechanised Updip Stoping Versus Transverse Retreat Panel Stoping

Underground Mining of Shallow-Dipping Orebodies in Australia...

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Twelfth International Symposium on Mine Planning and Equipment Selection

作者： Chanda, E.K. Corbett, C.J. Curtin University of Technology WA School of Mines Mining Engineering Program Locked Bag 22 Kalgoorlie WA 6433 Australia Thyssen Mining International TARA Mines Ireland

Many underground mining methods rely on blasted rock moving under gravity to report to extraction points. mining of orebodies dipping between 20 - 45 degrees poses a unique challenge for mining engineers in that a dip angle in this range will not allow the movement of broken ore down the footwall to the mucking horizon utilising gravity. This is more so in cases where the natural angle of repose of the rock is less than the dip of the orebody. Hence, innovative mining systems are necessary to mine this type of orebodies. In Australia, the method of uphole retreat panel stoping is commonly used to extract orebodies in the dip range of 20-45 degrees and thickness range of 5 - 15m. In the Zambian Copperbelt a method called continuous retreat updip stoping is used for orebodies with similar dips and thicknesses. The mechanised form of this mining method has potential for application in the metalliferous mining industry in Australia. In this study a comparison is made between mechanised updip (MUDS) and transverse retreat stoping (TRS) methods, A hypothetical nickel sulphide orebody located in Western Australia is used as case study. The net present value for mechanised updip stoping is seven per cent higher than that of transverse retreat stoping based on the assumptions applied. Initial results of this study indicate that mechanised updip stoping can be adopted for Australian mining conditions. However, lack of significant local experience with the method is often cited as a reason for not adopting it even in situations where it is clearly the best option.

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Effect of Pulse Parameters on the Particle Size of Copper Powder Electrodeposition 1

Effect of Pulse Parameters on the Particle Size of Copper Po...

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1st International Conference on Design and Application of engineering Materials 2018, IC-DAEM 2018 in conjunction with 11th Seminar Nasional Metalurgi dan Material, SENAMM 2018

作者： Wahyudi, S. Soepriyanto, S. Mubarok, M.Z. Sutarno Doctoral Program of Mining Engineering Faculty of Mining and Petroleum Institut Teknologi Bandung Bandung Indonesia Department of Material and Metallurgical Engineering Faculty of Engineering Institut Teknologi Sains Bandung Bekasi Indonesia Department of Metallurgical Engineering Faculty of Mining and Petroleum Institut Teknologi Bandung Bandung Indonesia Department of Metallurgical Engineering Faculty of Engineering Universitas Jenderal Achmad Yani Bandung Indonesia

In this paper, copper powder fabrication has been made via electrolysis method using CuSO4 and H2SO4 in aqueous media. Electrodeposition process of copper powder on a metallic surface is done by applying to continue current and pulse current with rectangular pulse waveform. Characterization of copper powder was carried out by SEM to confirm particle size and shape and EDX to determine the copper powder composition. In electrodeposition by applying to continue current to produce the copper powder with particle shape was dendritic, and the elemental composition of the powder was Cu and O. Regarding average particle size, pulse electrodeposition process produces the copper powder with average particle size up to 0.85μm, 72.6% smaller than if apply to continue current. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Particle size

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Impact of the 2004 Sumatra-Andaman Earthquake to the Stress Heterogeneity and Seismicity Pattern in Nothern Sumatra, Indonesia 2

Impact of the 2004 Sumatra-Andaman Earthquake to the Stress ...

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2nd Southeast Asian Conference on Geophysics, SEACG 2018

作者： Taufiq Rafie, Muhammad Sahara, David P Widiyantoro, Sri Dian Nugraha, Andri Master Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia Global Geophysics Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia

Sumatra Island is a highly seismic active region due to its close location to the convergent zone between the Indo-Australian and Eurasian plates, and the existence of the Great Sumatran Fault (GSF). These conditions caused the island of Sumatra suffered from hundreds of earthquakes with Mw > 4 per year. Particularly, a 9.0 Mw Sumatra-Andaman 2004 earthquake occured in northern Sumatra which changed the in-situ stress and seismicity pattern. In such case, quantifying the tectonic stress perturbation prior and after 2004 Sumatra-Andaman earthquake is becoming key issue in assessing the seismic hazard. To invert the in-situ stress information in Sumatra, first we identify the fault plane from its auxiliary plane in the focal mechanism solutions using the fault instability criterion. There are 354 focal mechanisms data of earthquake with Mw > 5 and focal depths © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Earthquakes

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Performance Evaluation of Geothermal Power Production Using EES (Case Study Ulumbu Geothermal Power Production Unit 4 East Nusa Tenggara, Indonesia) 9

Performance Evaluation of Geothermal Power Production Using ...

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Ediatmaja, Prajamukti Darmanto, Prihadi Setyo Maulana, Dimas Taha Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia

Ulumbu geothermal working area (GWA) is in Ruteng district, East Nusa Tenggara province, Indonesia. Ulumbu GWA is owned by PLN. There are four geothermal power plants (GPP) in Ulumbu, which capacity 4 x 2.5 MW. It has operated since 2013. Steam used to generate electricity comes from ULB-2 production well. Wellhead temperature and pressure were 180-200°C and 11 bar. Ulumbu GPP Unit 4 uses a condensing type turbine. It has specific steam consumption (SSC) during commissioning around 9.8 T/MW. After 6 (six) years of operation, SSC becomes 10.04 T/MW on average. It gives a chance to perform optimization in the GPP's equipment. Before performing optimization, evaluation for every equipment based on as-built data is done by modeling using EES software. The method of evaluation is performed by thermodynamics analysis in each GPP's equipment. EES is chosen due to its simplicity to arrange many equations in a single window. EES could communicatively display calculation results through a parametric table, solution window, and diagram window. Operation data give information that turbine inlet pressure is operated under its specification. Turbine inlet pressure is operated under its specification because of the change of operating wellhead pressure. Non-Condensable Gas (NCG) content also decreases based on the last ULB-2 well fluid sampling. Using EES, parameter changes in turbine inlet pressure and NCG content are simulated to get optimum power generation value. The simulation results indicate that optimum turbine inlet pressure is obtained at 9.3 bar with SSC 9.17 T/MW. Ulumbu GPP Unit 4 that operated in that condition could reach cycle efficiency of about 10.39%. © Published under licence by IOP Publishing Ltd.

关键词： Thermodynamics

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Near-surface S-wave Estimation base on Inversion of Rayleigh Wave Dispersion Curve Using Genetic Algorithm 2

Near-surface S-wave Estimation base on Inversion of Rayleigh...

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2nd Southeast Asian Conference on Geophysics, SEACG 2018

作者： Rubaiyn, Al Priyono, Awali Yudistira, Tedi Master Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia Global Geophysics Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia

Multi-channel analysis of surface wave (MASW) is a suitable technique to infer shallow structure of vertical shear-wave velocity profile from seismic record data. The processing stage is focused on obtaining the reliable dispersion curves, and the final stage of the method is that to obtain the shear velocity model that can explain the observation. The genetic algorithm (GA) method, one of the global optimization approaches, has been implemented to obtain shear wave model from Rayleigh wave dispersion curve. The GA method mimic biological evolution in order to obtain the optimum solution. Application of GA method to two synthetic models for normal velocity profile and low velocity anomaly give good results indicated with small misfit. Finally, we demonstrate the GA to Rayleigh dispersion curve for real data which calculated by using phase-shift method. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Genetic algorithms

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Study of the Heat Loss Effect in Geothermal Steam Production Well 9

Study of the Heat Loss Effect in Geothermal Steam Production...

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Wardana, Andrian Putra Saptadji, Nenny Miryani Maulana, Dimas Taha Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia

Well casing and cement temperature can change during geothermal production operation. The change of temperature occurs because of the heat transfer from the geothermal fluid to the formation. The heat transfer occurs because of the temperature difference in geothermal fluid and formation. The heat of fluid moves to the casing, cement, and formation through convection and conduction. This research aims to develop the heat transfer model in the steam production well, predict the steam heat loss and its effect on every 100 m well increment, and predict the well casing and cement temperature distribution and their effect on every well segment. The heat transfer model is an analytical calculation model developed to be the base of the calculation of heat loss and a temperature drop of well casing and cement. This model was developed for the calculation of heat loss in steam production well. The model was compared with a simulator to test the suitability. The fluid flow pressure drop and well lithology were considered in this model. The heat loss was very low during the steam production. The heat loss could be higher, along with the formation temperature drop. The material thermal conductivity and the well segment's layer thickness could affect the steam heat transfer in the production well. © Published under licence by IOP Publishing Ltd.

关键词： Cements

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Determining Source Model and Aftershocks of 2006 Yogyakarta Earthquake, Indonesia using Coulomb Stress Change 2

Determining Source Model and Aftershocks of 2006 Yogyakarta ...

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2nd Southeast Asian Conference on Geophysics, SEACG 2018

作者： Budiman, R. Sahara, D.P. Nugraha, A.D. Master Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia Global Geophysics Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia

On 26 May 2006 at 22:53:59 UTC, an earthquake with moment magnitude of 6.4 occurred in Yogyakarta, Indonesia. The source of the event is still debatable. Some believe the event was caused by the reactivation of the Opak Fault which has a left-lateral type movement. Previous studies indicated there are two possibilities to explain the mechanism of the Yogyakarta earthquake. First is based on the focal mechanism from NIED (National Research Institute for Earth Science and Disaster) Japan which indicated that the event occurred in an oblique reverse slip. This model states that the complex Opak fault is a flower structure (strike-slip) type. Second is based on NEIC (National Earthquake Information Center) US which indicated that the event was caused by a pure strike-slip fault (active Opak fault). The May 26th earthquake triggered many aftershock events around the old Opak fault. The majority of aftershock events on 3-6 June 2006 were located around 5 km east of Opak fault. It has a trendline of N45°E and lies parallel with the Opak fault. We use Coulomb Stress change to determine which type of source model fit better the aftershocks pattern. The target fault for Coulomb Stress analysis is a left lateral pure strike slip with an orientation of N45°E/90°SE. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Earthquakes

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Updating Hypocenter Relocation in Indonesia using 3D Seismic Velocity Model: Period of April 2009-March 2018 2

Updating Hypocenter Relocation in Indonesia using 3D Seismic...

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2nd Southeast Asian Conference on Geophysics, SEACG 2018

作者： Dian Nugraha, Andri Rosalia, Shindy Widiyantoro, Sri Supendi, Pepen Wiyono, Samsul Daryono Global Geophysical Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia Graduate Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia Meteorological Climatological and Geophysical Agency of Indonesia Jakarta Indonesia

In the past 2 years, we have been conducting routine hypocenter relocation in Indonesia. We compiled and conducted hypocenter relocation of ∼50.000 events from a magnitude of 1.4 to 8.5 recorded by 451 stations around and outside Indonesia region. We used local, regional, and teleseismic arrival time data from Indonesian Agency of Meteorology, Climatology, and Geophysics (BMKG) catalog from April 2009 to March 2018. We performed teleseismic double-difference relocation inversion using our previous study of 3D seismic velocity model beneath the Indonesian region with grid size 1° by 1° for inside Indonesia region and 1D global seismic velocity model from AK135 for outside Indonesia region. This method improved limitation from BMKG earthquake data catalog in which events were recorded from scattered seismic station array and insufficient azimuthal gap around Indonesia. Our results show that travel-time RMS residuals were greatly reduced compared to those of the BMKG catalog and the hypocenter location shows significant improvement, refining to the geological structure, especially trench and major faults. These hypocenter relocation results can be helpful for another seismic study in Indonesia region that required a precise hypocenter location e.g. body wave tomography and probability seismic hazard analysis. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Seismic waves

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Refining the Regional Aftershocks Catalog of the Ambon Earthquake Mw 6.5 on 26 September 2019 using manual picking and a non-linear algorithm: Preliminary Result 9

Refining the Regional Aftershocks Catalog of the Ambon Earth...

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9th Asian Physics Symposium 2021, APS 2021

作者： Kamaruddin, B. Sahara, D.P. Halauwet, Y. Master Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Indonesia Earth Sciences Graduate Program Faculty of Earth Sciences and Technology Bandung Institute of Technology Indonesia Ternate Indonesia Ambon Indonesia

A destructive earthquake with magnitude Mw 6.5 occurred in Ambon, Indonesia, on 26 September 2019. This earthquake generated an aftershock sequence. In this study, we determined the location of the aftershock sequence using a non-linear algorithm from the Non-Linear Location (NonLinLoc) program. The catalog and waveform data were collected using 11 seismographs from BMKG regional network located around the Maluku archipelago. The data was recorded between 26 September and 18 October 2019. We have manually picked the P-and-S wave phase by using Seisgram2K software. In our preliminary result, we have located about 1,300 events of aftershock sequence with about 8,500 phases of P and S waves. Overall, the location of the focus depth of the aftershock sequence is dominantly distributed in between 5 - 25 km. Approximately ∼70% of the distribution of aftershock locations show a North-South (N-S) oriented pattern from west Seram to Ambon Islands. Meanwhile, about ∼20% of the aftershock's locations are distributed around Ambon Island. Our ongoing and future study is to determine accurate hypocentre location derived from double-difference hypocenter relocation with waveform cross-correlation. © Published under licence by IOP Publishing Ltd.

关键词： Location

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Subsurface Modeling Based on Gravity Data of Rendingan-Ulubelu-Waypanas (RUW) Geothermal Field, Lampung, Indonesia 2

Subsurface Modeling Based on Gravity Data of Rendingan-Ulube...

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2nd Southeast Asian Conference on Geophysics, SEACG 2018

作者： Widya Permatasari, Ana Santoso, Djoko Setianingsih Undergraduate Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia Applied and Exploration Geophysics Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia

Indonesia is located along the archipelago which has abundance of volcanoes along the arc. Therefore, Indonesia has a very high geothermal energy potential, such as the Rendingan-Ulubelu-Waypanas Geothermal Field in Tanggamus Regency, Lampung Province. Geophysical exploration is required to characterize the subsurface geothermal system. One of the methods that can be used is gravity method. The data used in this study is an analog Rendingan-Ulubelu-Waypanas Geothermal Field Complete Bouguer Anomaly Map of 2005. The analog map was then converted into digital map for further data processing. Separation of regional and residual Bouguer anomalies has been performed using moving average and spectral filter methods, in which the spectral analysis was conducted in 1D and 2D. The value of Bouguer background density used for 2.5D subsurface modeling is 2.67 g/cc. The gravity anomalies obtained in this study can be interpreted as follow. The existence of high anomalies under Mount Waypanas was interpreted as a Tertiary intrusion of granite with a density contrast of 0.22 g/cc. While low anomalies in the northern part was interpreted as a Quaternary intrusion of diorite with a density contrast of -0.22 g/cc, which acts as the heat source of the system. The reservoir of the system is the Quaternary young volcanics exposed on the surface with averaged thickness of 1500 m. We concluded that the fluid flow in this geothermal system is the meteoric water from Mount Rendingan and Mount Tanggamus, which has a higher topography, flows to a lower topography area in the Mount Waypanas, The fluid flow also creates an upflow under Mount Rendingan. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Topography

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