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INDONESIA
INDONESIAN MINING PROFESSIONALS JOURNAL
Published by Perhimpunan Ahli Pertambangan Indonesia
ISSN : 27148823     EISSN : 27159035     DOI : https://doi.org/10.36986/impj.v1i1.6
Core Subject : Engineering,
Aerospace Engineering
This Journal is published periodically two times annually : April and October, containing papers of research and development for mineral and coal, including Mining Exploration, Surface Mine System and Operation, Underground Mine System and Operation, Geotechnical, Mine Safety and Mine Environment, Mine Management, Mine Ventilation, Mineral and Coal Economics, Coal and Mineral Processing and Smelting, Metallurgy, Coal and Mineral Trading, Mining Law and Policy, Mining CSR and Community Development, and Technology and Innovation in Mining. The editors only accept relevant papers with the substance of this publication.
Arjuna Subject : Energi (semua kategori) - Energi (Lain-Lain)
Articles 64 Documents
 1   2   3   4   5 
PENINGKATAN KOMPETENSI KARYAWAN DAN SAFETY CULTURE MELALUI LEARNING MANAGEMENT SYSTEM “SINTESIS+” SEBAGAI KONTROL OPERASIONAL Chandra Singgih Pitoyo; Yuristian Yuristian; Cahyo Andrianto; Riza Rahmah Angelia
Indonesian Mining Professionals Journal Vol 1, No 1 (2019): NOVEMBER
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36986/impj.v1i1.15

Abstract

With 118.400 hectare of concession area and employed people for more than 21.694 employees within company and from business partners, Berau Coal needs to put more concern in managing operational and health, safety and environment (SHE). The challenges that need to be faced are location that scattered into 4 operational areas, limited time for employess to access information because most of time exploitated for working, various educational background, and technology literacy. Berau Coal has been developed a learning platform, named SINTESIS+ and SID. The aims in development of those platforms are; (1) as a operational and HSE-themed learning platform, (2) toincrease capacity and to build HSE and operational competencies, (3) to increase operational control for competencies related to entry permit, work permit, license, and specialization, and (4) to intervene employees’ behaviour to build safety culture. Features and contents that has been embedded in SINTESIS+ are online learning with multimedia materials, online testing with real time result, webinar, incident and mining operational news, repositories for employees’ portfolio, event and training registration, integrated with SID to recordemployees’ historical competency-related data, and sustainable process to increase HSE awareness. Since its launching, SINTESIS+ has been accessed by 7867 employees, tested for 1024 exams, conducted webinar that participated by 330 employees, and run more effective and efficient processes. Impacts from integration process with SID are the increase of compliance level for competencies to 98% and the increase of process control efficiency. With those increments, beside the employees’ compency and HSE awareness is increased, hoped to lower incident rate. In the future, to improve access to the platform, Berau Coal is willing to develop mobile apps forSINTESIS+.
Vibration Management for Slope Stability with “Signature Hole Analysis” Method in Open Pit Blasting Activity Muhammad Syafiq Isnaya; Muhammad Fadil Bellico; Dwi Agung Priyanggoro
Indonesian Mining Professionals Journal Vol 1, No 1 (2019): NOVEMBER
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36986/impj.v1i1.9

Abstract

One of the impact blasting activity is Ground Vibration which will affect the stability of the slope. Research and experiment conducted using Signature Hole Analysis (SHA) for monitoring wave propagation in each block-strip used to model and predict vibration which caused by the blasting activity. Signature Hole Analysis combined with Scaled Distance has succeeded in becoming the solution of ground vibration management.
STUDI PENGARUH GEOMETRI LERENG PADA ANALISIS KEMANTAPAN LERENG 2D DAN 3D DENGAN METODE KESETIMBANGAN BATAS Muhammad Zaini Arief
Indonesian Mining Professionals Journal Vol 2, No 1 (2020): April
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36986/impj.v2i1.27

Abstract

Kestabilan suatu lereng umumnya dilakukan secara 2 dimensi (2D) karena dinilai lebih sederhana daripada 3 Dimensi (3D). Oleh karena itu, hanya sedikit analisis dilakukan secara 3D. Akan tetapi, jika dilihat dari asumsi lebar lereng analisis 2D dapat menjadi tidak representatif karena asumsi lebar lereng yang tak terbatas. Melalui analisis secara 3D hasil yang didapat lebih dapat dipercaya karena memperhitungkan batasan akhir lebar bidang longsor. Selain itu, volume dari potensi bidang longsor pun dapat diestimasi sehingga dapat digunakan sebagai bahan pertimbangan dalam pengambilan keputusan tindakan, selanjutnya sesuai dengan fungsi lereng. Hasil penelitian ini membuktikan lebar lereng 3D sangat berpengaruh terhadap geometri lereng 2D, dimana hasil Faktor Keamanan (FK)  2D baru hampir sama dengan FK 3D dapat diterima apabila rasio antara lebar (W) dengan tinggi (H) yaitu: tinggi 3 m dan 6 m rasio W/H sebesar 3,3, tinggi 12 m rasio W/H sebesar 2,5, dan tinggi 24 m rasio W/H sebesar 2,1 dengan material limonit, saprolit dan bedrock. Hasil FK 3D lebih besar dari FK 2D hal ini juga disebabkan oleh adanya pengaruh rasio lebar lereng dengan tinggi lereng. Dalam analisis 2D, besar lebar lereng dianggap tidak terbatas (bidang lonsoran busur tidak terbatas), sedangkan dalam analisis 3D besar lebar lereng memiliki batasan (bidang longsoran berbentuk 1/4 bola). Dengan demikian hasil yang diperoleh pasti berbeda, baik besar nilai FK maupun lokasi bidang longsornya.
Dynamic Analysis of Blasting Effect on Nanjung Tunnel Stability Alio Jasipto; Nuhindro Priagung Widodo; Ganda Marihot Simangunsong; Simon Heru Prasesetyo; Made Astawa Rai; Dhika Noor Pradhana; Dimas Agung Saputra
Indonesian Mining Professionals Journal Vol 2, No 1 (2020): April
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36986/impj.v2i1.17

Abstract

This study aims to dynamically analyze blasting conducted in the Nanjung tunnel. Nanjung Tunnel is a twin tunnel that has a horseshoe-shaped section with each tunnel having a dimension of 10.2 m x 9.2 m, and 230 meters in length. The layers rock of this tunnel include silty clay, sandstone and dacite. Blasting was carried out on one of the tunnels consisting of dacite rock, having a 75-90% RQD and UCS 49-61 MPa. During the blast, PPV measurements were taken at several points around the tunnel using a minimate.Dynamic analysis is done by building a Nanjung Tunnel model on the RS2 software with the finite element method. Input data in this modeling is endeavored to approach actual conditions in the field, such as tunnel geometry, rock mass properties, and blasting plans carried out at STA 30-32 tunnels 2. This modeling is expected to produce PPV that is close to actual PPV and the results of this model will be continued to the stability analysis tunnel 1.Modeling results indicate that the tunnel 1 condition is stable during blasting. The stability of tunnel 1 based on smallest strength factor on the roof is around 2.6. Stability also seen from the strain level in dacite and sandstone rocks which are 0.07% and 0.38%. These strain levels are still permissible according to the Sakurai strain level diagram, 1983.
Analysis of Carbon Monoxide Gas Dilution on Horizontal Tunnel Front using Laboratory Scale Physical Model Addien Wisnu Harnoko; Nuhindro Priagung Widodo; Ahmad Ihsan
Indonesian Mining Professionals Journal Vol 1, No 1 (2019): NOVEMBER
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36986/impj.v1i1.10

Abstract

Potential hazards that often occur in underground tunnels are dangerous and toxic gases, one of which is carbon monoxide (CO) which can be found in underground tunnels for example as a result of imperfect detonation on work surfaces. CO gas is very poisonous so it can cause death. This study aims to determine the spread of CO gas when diluting with tunnel ventilation in the horizontal front. This research was conducted on a physical model of the laboratory with a ratio of 1:10 compared to the actual tunnel, that is at the cross section of the model in the laboratory 40 cm x 40 cm. The effectiveness of dilution or dilution is indicated by the value of the diffusion coefficient, where the greater the diffusion coefficient, the more diffused the CO gas concentration, so the faster the CO gas concentration decreases. The parameters of the test conditions are the ratio of the duct to face distance (L/D) and the Reynolds number (Re) which shows the variation of air velocity in the tunnel work surface. Test results from the distribution of CO gas showed the influence of the configuration of the forcing duct and exhausting duct distances on the working front to the CO gas dilution. In this study also found the influence of Reynolds numbers on the value of the diffusion coefficient, that the greater the value of Re, the greater the value of E.
IDENTIFIKASI ZONA KAYA KOBALT PADA CEBAKAN NIKEL LATERIT DI INDONESIA Nur Anbiyak; Tyas Cahyaningrum
Indonesian Mining Professionals Journal Vol 2, No 2 (2020): November
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36986/impj.v2i2.35

Abstract

Kebutuhan kobalt dunia meningkat secara signifikan dan diproyeksikan tahun 2030 akan mencapai 430 ribu ton seiring dengan peningkatan permintaan industri mobil listrik dan penerbangan.  Saat ini, lebih dari 60% kebutuhan kobalt berasal dari tambang tembaga-kobalt di Afrika Tengah. Indonesia menyimpan sumberdaya kobalt dalam cebakan nikel-kobalt laterit berpotensi menjadi salah satu pemasok di masa depan jika tersedia fasilitas pengolahan bijih kobalt. Cebakan nikel-kobalt laterit merupakan produk pelapukan batuan ultrabasa dari kompleks ofiolit yang tersebar di Indonesia bagian timur. Pelapukan kimia batuan ultrabasa menghasilkan perlapisan profil laterit yang terdiri dari batuan dasar, saprolit, dan limonit. Ketebalan lapisan saprolit dan limonit dipengaruhi laju pengangkatan tektonik dan ketinggian muka air tanah, dimana seiring waktu pelapukan, laju pengangkatan tektonik rendah dan muka air tanah relatif tinggi akan menghasilkan lapisan saprolit yang relatif tebal. Berdasarkan evaluasi di Sulawesi, Halmahera, dan Papua Barat, konsentrasi tertinggi kobalt berada pada bagian bawah lapisan limonit antara 0,1-0,3%. Keberadaan kobalt pada zona ini berasosiasi dengan mineral-mineral Mn-oksida dengan jumlah sumberdaya keseluruhan mencapai 2,9 miliar ton. Hingga saat ini fasilitas pengolahan kobalt belum tersedia dan sebagian besar hanya mengekstraksi bijih nikel dari lapisan saprolite. Oleh karena itu diperlukan upaya konservasi untuk menyelamatkan bijih kobalt demi keberlangsungan industri pertambangan dan turunannya di masa depan.
PENGARUH KOMPOSISI MASERAL BATUBARA MUARA WAHAU TERHADAP PERILAKU TERMAL MENGGUNAKAN PENDEKATAN PIROLISIS DENGAN THERMOGRAVIMETRIC ANALYSIS (TGA) Agus Haris Widayat; Komang Anggayana; Basuki Rahmad; Luthfi Hafizh Azhar
Indonesian Mining Professionals Journal Vol 2, No 2 (2020): November
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36986/impj.v2i2.33

Abstract

Empat conto batubara dari daerah Muara Wahau telah diteliti untuk mengetahui karakteristik termal dengan pendekatan analisis pirolisis dan perangkat thermogravimetric analysis (TGA). Perilaku termal ini dapat memberikan gambaran yang dialami oleh batubara selama proses pembatubaraan di alam, pembatubaraan buatan, salah satu proses yang terjadi pada gasifikasi batubara bawah tanah, pencairan batubara, dan lain-lain. Analisis proksimat, ultimat, dan petrografi batubara juga dilakukan untuk mengetahui komposisi bahan organik yang terkandung di dalamnya. Hasil analisis menunjukkan bahwa batubara Muara Wahau mempunyai komposisi maseral inertinit yang cukup bervariasi dari 6% hingga 18% (v/v). Analisis TGA menunjukkan bahwa semakin tinggi kandungan maseral inertinit, penurunan massa conto secara umum semakin rendah. Hal ini menunjukkan bahwa maseral inertinit cenderung tidak berevolusi selama proses pemanasan. Hasil ini memberikan implikasi bahwa batubara yang mengandung maseral inertinit kurang direkomendasikan untuk jenis pemanfaatan yang dipengaruhi oleh reaktivitas maseral seperti gasifikasi dan pencairan.
PURCHASING STRATEGIES IN THE KRALJIC PORTFOLIO MATRIX – A CASE STUDY IN OPEN PIT COAL MINING Alim Perdana; Nur Budi Mulyono
Indonesian Mining Professionals Journal Vol 3, No 1 (2021): April
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36986/impj.v3i1.41

Abstract

Kraljic matrix (or Kraljic model) is a method used to segment the purchases or suppliers of a company by dividing them into four quadrants, based on the complexity (or risk) of the supply market (such as monopoly situations, barriers to entry, technological innovation) and the importance of the purchases or suppliers (determined by the impact that they have on the profitability of the company). This quandrant allows the company to define the optimal purchasing strategies for each of the four types of purchases or suppliers. In coal mining company, hundred thousand goods, part number or SKUs are purchased by corporate in fulfilling its mining operations requirement. However, the commodities generally purchased by open pit coal mining company are classified into 6 (six) classes which are fuel, maintenance of mobile equipment, blasting material, tyre, lubricants, and others. With the complexity of dealing with suppliers, it is mandatory for developing purchasing strategies as part of managing of supply chain. Mining operations and profitability of coal mining company shall depend on the total cost of ownership in purchasing the abovementioned commodities. This Kraljic Portfolio Model (1983) will assist coal mining company in applying purchasing strategies based on the class or quadrant which has been developed. Objective of this research is to develop purchasing strategies by empirically quantifying using data from a comprehensive survey among purchasing professionals in coal mining industry. Kraljic Portfolio Matrix is developed with 2 (two) stages of questioner. First questioner is to assess the importance level of each attribute in the dimension of purchasing activity by using Analytical Hierarchy Process. Second questioner is to assess every commodity’s scoring against each supply attribute. Subsequently, the matrix is developed by using SPSS (Statistical Product and Service Solutions) software. This research successfully classifies purchasing commodity in the appropriate quadrant of Kraljic Portfolio Matrix. By classifying the commodities purchased by coal mining company in the right quadrant of Kraljic Portfolio Matrix, the company will be able to implement the right purchasing strategies which will be different in one quadrant and another.
METODE GAS TRACER UNTUK EVALUASI EFISIENSI VENTILASI TAMBANG BAWAH TANAH Arif Widiatmojo; Nuhindro P Widodo; Kyuro Sasaki
Indonesian Mining Professionals Journal Vol 3, No 1 (2021): April
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36986/impj.v3i1.28

Abstract

Ventilasi tambang bawah tanah mempunyai peran penting untuk memastikan kecukupan suplai udara segar untuk pekerja tambang, mesin bakar internal, melarutkan gas dan partikulat, maupun menjaga suhu dan kelembaban udara. Design yang tidak benar dapat  menyebabkan kebocoran dan resirkulasi udara, menurunkan efisiensi energi untuk sistem ventilasi secara total. Di lain hal, difusi turbulensi mengendalikan penyebaran gas dan partikulat.Makalah ini membahas penggunaan gas tracer untuk mengevaluasi efisiensi dari sistem ventilasi tambang. Dengan mencocokkan hasil pengukuran lapangan dengan simulasi numerik, kuantitas suplai udara yang terbuang disebabkan karena kebocoran dapat dievaluasi. Selain itu, laju pertukaran udara di front tambang juga di analisa berdasarkan data peluruhan gas. Sebagai hasil analisa, sekitar 53.5% udara bersih terbuang langsung melalui kipas utama. Sedangkan, laju pertukaran udara di salah satu front tambang, adalah sekitar 6.48 kali per jam.
PERBANDINGAN TIGA PENDEKATAN GEOSTATISTIK UNTUK MEMODELKAN KETIDAKPASTIAN DALAM ESTIMASI SUMBERDAYA TIMAH DAN MINERAL IKUTAN TIMAH PADA ENDAPAN ALUVIAL Raymond Kosher Sianturi; Mohamad Nur Heriawan; Syafrizal Syafrizal; Cahyo Okta Ardian; Satyogroho Dian Amertho; Ichwan Azwardi Lubis
Indonesian Mining Professionals Journal Vol 2, No 2 (2020): November
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36986/impj.v2i2.34

Abstract

Blok C merupakan salah satu blok endapan aluvial di Pulau Bangka yang memiliki prospek timah dan mineral ikutan timah seperti ilmenite, rutile, anatase, zircon, dan monazite. Endapan aluvial umumnya memiliki variabilitas yang tinggi sehingga faktor ketidakpastian akan sumberdaya timah dan mineral ikutan timah juga tinggi. Pada penelitian ini dilakukan perbandingan antara 3 (tiga) pendekatan geostatistik untuk memodelkan ketidakpastian sumberdaya dengan studi kasus pada endapan aluvial di Blok C di Pulau Bangka. Untuk mengetahui variabilitas global di daerah penelitian dilakukan dengan menggunakan metode Global Estimation Variance (GEV), sedangkan untuk mengetahui variabilitas lokal dilakukan menggunakan Sequential Gaussian Simulation (SGS) dan Discrete Gaussian Model (DGM). Hasil dari metode GEV dibandingkan dengan metode SGS dan hasil dari metode SGS juga akan dibandingkan dengan metode DGM. Dari hasil perbandingan GEV dan SGS menunjukkan bahwa hasil GEV cenderung less confidence jika dibandingkan dengan hasil SGS. Less confidence pada hasil GEV disebabkan oleh efek proporsional di daerah penelitian. Hasil perbandingan SGS dan DGM menunjukkan pola yang hampir sama untuk Sn (timah) dan ilmenite+rutile+anatase serta pola yang cukup berbeda untuk zircon. Perbedaan ini disebabkan oleh pemusatan data yang merupakan bagian dari metode DGM. Selain itu, mayoritas nilai minimum hasil DGM lebih besar daripada nilai minimum hasil SGS dan nilai maksimum hasil DGM lebih kecil daripada nilai maksimum hasil SGS. Hal ini disebabkan oleh change of support coefficient (r) yang mempengaruhi fungsi dari transformasi

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