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Bachtiar Effendi
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INDONESIA
Indonesian Mining Journal
Published by Balai Besar Pengujian Mineral dan Batubara tekMIRA
ISSN : 08549931     EISSN : 25278797     DOI : 10.30556/imj
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Materials Science & Nanotechnology
This Journal is published periodically two times annually : April and October, containing papers of research and development for mineral and coal, including exploration, exploitation, processing, utilization, environment, economics and policy. The editors only accept relevant papers with the substance of this publication.
Arjuna Subject : Energi (semua kategori) - Energi (Lain-Lain)
Articles 269 Documents
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IMPACT OF ILLEGAL GOLD MINING IN JAMBI, INDONESIA Wibowo, Yudha Gusti; Ramadan, Bimastyaji Surya; Maryani, Anis Tatik; Rosarina, Desy; Arkham, La Ode
Indonesian Mining Journal Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol25.No1.2022.1271

Abstract

Illegal gold mining caused various environmental damages in the world. Indonesia is one of the countries with abundant mineral reserves, especially Jambi Province. Jambi has much of natural resources, such as coal and gold. Unfortunately, the management of these natural resources has not been appropriately managed, which has resulted in much illegal gold mining. Illegal mining activities have caused environmental damage, mainly decreased water quality and changed landscapes. This paper explains the illegal mining activities at Jambi Province, including its history, socio-economic and environmental impacts, as well as recent technologies to reduce the environmental damage. Quantitative and qualitative methods were used in this research, including interviews, questionnaires, and laboratory measurements. The results showed that the people of Sarolangun, Bungo, and Tebo were aware that their illegal gold mining activities caused environmental damage. However, economic conditions and insufficient employment opportunities made unlawful gold miners have no other choice. Illegal gold mining activities have also shifted people's livelihoods who previously worked as farmers.
GEOTECHNICAL STUDY FOR ANALYZING SLOPE STABILITY BETWEEN TWO MINING PIT BOUNDARY Zulfahmi Zulfahmi
Indonesian Mining Journal Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol25.No1.2022.1279

Abstract

This paper is a new concept to increase the safety and mining conservation on PT-X and PT-Y with no boundary gap between the two areas. To optimize coal recovery as a basis of supporting conservation, the two companies needed to adjust coal production in terms of avoiding technical problems at the mining time process due to the rock structure and coal seam at the border were the same. PT-X plans to produce 2 million tons of coal, but the government only approved 1 million tons, while PT-Y still approved 2 million tons. This paper discusses the instability of mining in border locations due to the differences of coal production. The applied methodology is conducting geotechnical modeling by considering statistical aspects of data distribution and the probability of failure. Based on the results of geotechnical modeling by numerical methods on the basis of 2D and 3D for the difference in the production level of 1 million tons in all cross-sections, the FK value is 0.992 - 1.248 with a probability of failure (PI) of 5.40 - 48.00%. Results of modeling analysis show that both single and overall slopes are at a critical level and are not safe. If this difference is narrowed by increasing PT-X's coal production by 1.5 million tons, the border location's mining conditions will stabilize. Therefore, it is necessary to propose to the government for PT-X's coal production to be added by at least 500.000 tons so that the production process of each company runs safely.
THE EFFECT OF USING CACO3 AND LIME GLASS IN THE PROBABILITY OF PORE STRUCTURE FORMING ON A CERAMIC GLASS BASED ON SCORIA BASALT ROCKS David Candra Birawidha; Yusup Hendronursito; Kusno Isnugroho; Muhammad Amin; Anton Sapto Handoko; Sentausa Nuringjati; Syafriadi Syafriadi
Indonesian Mining Journal Vol 25 No 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol25.No2.2022.1281

Abstract

With the development of technology lately, the technology for making lightweight materials is also growing, where the goal is to reduce the total weight of the material without reducing its mechanical strength. Several parameters that influence the manufacture of lightweight materials are the number of pores, materials weight, and physical resistance. One commonly used method is mixing ceramic glass with a foaming agent. In this study, basalt rock from East Lampung, Indonesia, and lime glass was used as a ceramic glass material mixed with CaCO3, which melted down at a temperature of 1200 0C. Variations in composition were carried out by mass comparison between basalt and lime glass, namely A sample (100:0), B sample (70:30), C sample (50:50), and D sample (30:70) with 50%wt CaCO3 added for each sample and heated up to 1200 0C. Treatment variations (annealed and normalized) are also applied to see the phenomena occur. Based on the characterization results, the best sample obtained is in B sample with normalized treatment, whose has porosity value of 53.2% and density value of 1.08 gr/cm3. Based on the results of the SEM test, the pores with a size ≤ 0.5µm are 95%, and ≥ 0.5µm are 5%, where the crystals formed are pyroxene and calcite with the compositions of CaO and SiO2, respectively 39.46% and 41.90%.
BIO-ORGANO MINERAL EFFECT ON SOIL FERTILITY, NUTRIENT UPTAKE, AND SWEET CORN (Zea mays L. saccharata) GROWTH PLANTED IN INCEPTISOLS SOILS Restu Wulansari; Maryono Maryono; Didit Adi Darmawan; Faris Nur Fauzi Athallah; Fardian Khairul Hakim
Indonesian Mining Journal Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol25.No1.2022.1282

Abstract

Sweet corn (Zea mays L. saccharata) is a horticultural product widely consumed by Indonesian people because of its sweetness. Corn requires sufficient nutrients to grow and produce the optimal yield so that the fertilization is a determining factor in corn cultivation. Bio-organomineral fertilizer (BIOM) is a fertilizer that combines mineral, organic, and biological elements (microorganisms). This study aims to examine the effect of BIOM on growth of sweet corn, nutrient uptake, and soil fertility. Experimental design used in this research was Randomized Block Design (RBD) with nine treatments and three replications which consist of treatments control; 1 NPK; ½ BIOM; 1 BIOM; 1 NPK + ½ BIOM; 1 NPK + ¾BIOM; 1 NPK + 1 BIOM; ¾NPK + 1¼BIOM; and ¾NPK + 1½BIOM. Effect of BIOM fertilizer at 100% dosage significantly increased the plant height, stem diameter, and canopy diameter compared to the control. BIOM fertilizer had a significant effect on the N uptake, total N, P-potential, P-available, K-potential, and K- exchangeable. The fertilizer is able to provide positive results on the growth of sweet corn, so it’s more effective for the availability of nutrients needed by sweet corn plants.
GIS APPLICATION FOR MONITORING THE MINE AREAS Weningsulitri Weningsulitri; Retno Damayanti; Tri Widarti Masduki; Jeani Sulistyowati; Muhamad Lutfi; Bagaraja Sirait
Indonesian Mining Journal Vol 25 No 2 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 2, October 2022
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol25.No2.2022.1283

Abstract

Technology development is growing fast, such as satellite imagery and GIS for various applications, one of them is mining technology. Several regulations for the mining sector regarding the mandatory use of satellite imagery have been stated in some regulations to be implemented in mining sectors. Some mine environmental studies showed that the remote sensing and the GIS analysis could detect the small changes in its environment area with effective cost as the coverage of the sensory images is quite broad. The purpose is to monitor land alteration by observing the changes at the taking place, in either the number of voids or their area, using the 2019 and 2020 SPOT 6/7 image data. The algorithm change detection analyzes the number and void changing, mainly to provide a visual description of the void image trend and other applications. The trend of void numbers and its area can be predictable and correlated with the coal mine activities yearly. The results of 2019 SPOT 6/7 image showed that the total area of coal mine pit increased from 2% of the total area of the IUP to 2.53% in 2020. But, its allegation of environmental changes due to the mining activities will be strengthened by a ground check survey that cannot be conducted now.
EKSPLORASI FUNGI MIKORIZA ARBUSKULA INDIGENOS PADA ARENGA PINNATA MERR DI LAHAN PASCATAMBANG Shaleha Istiqamah Samal; Irdika Mansur; Ahmad Junaedi
Indonesian Mining Journal Vol 26 No 1 (2023): Indonesian Mining Journal, April 2023
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol26.No1.2023.1285

Abstract

Mining activities have a positive impact that can generate income for the state, but the activities also cause negative impacts in the form of soil damage, vegetation and animal losses to disrupt the ecosystems. Therefore, it is necessary to carry out a reclamation with revegetation using local plant species. PT Berau Coal has conducted revegetation using a local sugar palm plant (Arenga pinnata). The success of sugar palm plant growth in post-mining reclamation land is influenced by several factors, one of it is the symbiosis of the arbuscula mycorrhizal fungi (AMF) with the sugar palm planted by PT Berau Coal. The purpose of this study was to determine the diversity of indigenous spores in the arenga rhizosphere and root colonization of sugar palm plants. Identification of the AMF diversity was carried out by observing the soil taken from the palm rhizosphere with a depth of 0-20 cm and 20-40 cm. Isolation of spores using the wet pouring technique method with centrifuges and AMF spores were identified using the INVAM methods. The observation of AMF colonization on plant roots was carried out through the root staining technique with the Clapp modification method. The results showed that the AMF spores were found in 3 AMF genera at the observation site, namely genus Glomus (15 sp), Acaulospora (3 sp), and Gigaspora (1 sp). The highest spore abundance is genus Glomus sp at a soil depth of 0-20 cm. The AMF structures found colonizing the roots of sugar palm plants are hyphae, vesicles, and spores.
OVERVIEW ON AN OPEN PIT MINE PLANNING OF THE PICKSTONE PEERLESS IN A VOLATILE ENVIRONMENT Tapiwa Frank Kwachara Ngoroyemoto; Charles Chewu; Desire Runganga; Tatenda Nyamagudza; Ashley Ruvimbo Sabao
Indonesian Mining Journal Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol25.No1.2022.1288

Abstract

The prevailing mining climate is highly characterized by unstable consumables pricing systems, a volatile economy and skyrocketing operational costs, and exacerbated by a steady decline and intermittence in the availability of electricity. Zimbabwean mines need to extensively capitalize on the opportunity to improve productivity by emphasizing variables they can control, predominantly operational efficiency to avoid resizing of operations or facilitating downsizing by relatively insignificant factors. In this study, cycle times, rig penetration, utilization, availability and payloads were used to evaluate the mining cycles, operator costs and the information was compared against the life of mine plans with block models. Shifts were restructured to be concordant to the schedule provided by the utility company to save fuel that was being used to power metallurgical plant. Several challenges have been identified as the principal reasons behind discrepancies between the theoretical capabilities of equipment were proven to be achievable by a trial schedule which reduced the 7 days/month to less than 2 days a month. The new schedule reflects a theoretical improvement of close to 25% and significantly lower operational costs. The current mining fleet is capable of meeting the stipulated targets and even achieving more even within tough working environments characterized by harsh load shedding schedules and volatile inflation rates; however, this requires stringent monitoring and evaluation of unit process. By adopting the recommended short term production plans will avoid resizing of operations as it automatically reduces the operational costs by US $3 million annually whilst coercing both operators and management to improve their operational efficiency.
OPTIMALISASI PELINDIAN BIJIH MANGAN ASAL TIMOR TENGAH UTARA MENGGUNAKAN H2O2 SEBAGAI PEREDUKSI Faustina De Yesu Prisila Abi; Rachmat Triandi Tjahjanto; Yuniar Ponco Prananto
Indonesian Mining Journal Vol 26 No 1 (2023): Indonesian Mining Journal, April 2023
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol26.No1.2023.1301

Abstract

Optimization of manganese ore leaching process from North Central Timor, Indonesia has been investigated. The final product of the leaching process was MnSO4. Variables that were optimized during the process were volume of H2O2, reaction temperature, and reaction time. The final products were characterized by FTIR, powder-XRD, XRF, and AAS. Experimental data shows that the optimum conditions for the leaching process were 50 mL H2SO4 4 M, 25 mL H2O2 2 M, in which the reaction was done at room temperature for two hours. This optimum condition resulting in 38.2% of Mn extraction with 96.88% purity. Based on powder-XRD, the products were a mixture of crystalline MnSO4.4H2O, MnSO4.5H2O and [NH4]8[Mn8(SO4)12].
Abstract Indext Tatang Wahyudi
Indonesian Mining Journal Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol25.No1.2022.1320

Abstract

EVALUASI KESTABILAN LERENG BATUAN MENGGUNAKAN Q-SLOPE, KESETIMBANGAN BATAS DAN PROBABILITAS LONGSOR PADA TAMBANG ANDESIT DESA SIDOMULYO Wahyu Nusantara Akbar; Bagus Wiyono
Indonesian Mining Journal Vol 26 No 1 (2023): Indonesian Mining Journal, April 2023
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol26.No1.2023.1329

Abstract

For an open pit mine, the rock slope stability is one of the major significant challenges at every stage in the operation of an open pit mine. It became a concern from the planning until the mining closure. Mining activities in the research location have entered the mining closure phase and produced the final slope that consists of 4 single slopes with an overall slope height of 65m and an angle of 62° that its stability is not yet known. The actual overall slope has discontinuities which affect the potential for failure. Most of the methods used in geotechnical practice for estimating slope stability are based on the traditional limit equilibrium methods. On the other side, very few empirical techniques exist to assess the slope stability. The empirical method of the Q-Slope is a relatively new methodology for assessing the slope stability in terrains built from rock masses. This method was developed over the last decade by Barton and Bar (2015), with modifications to the original Q-System for application in rock slope stability through the parameter of RQD, Jn, Jr, Ja, O-Factor, Jwice, SRFa, SRFb and SRFc. The stability analysis by Q-Slope method has resulted the slope in stable condition because the value of βQ-Slope > βSlope. The factor of safety limit equilibrium method and probability of failure used the actual geometry and Q-Slope geometry is known in stable condition because it fulfils acceptance criteria with FoS ≥ 1,1 and PoF ≤ 37,5% according to the regulation Ministry of Energy and Mineral Resources Decree 1827/K/30/MEM/2018.

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