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Harjuni Hasan
Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Mulawarman
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences

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PENGGUNAAN RIPPER DALAM MEMBANTU EXCAVATOR BACK HOE PADA PENGUPASAN OVERBURDEN TANPA PELEDAKAN (Blasting) PADA TAMBANG BATUBARA SKALA KECIL Hasan, Harjuni
APLIKA Jurnal Ilmu Pengetahuan dan Teknologi Vol 8, No 1 (2008): Februari 2008
Publisher : APLIKA Jurnal Ilmu Pengetahuan dan Teknologi

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Abstract

Ripper merupakan alat bantu Bulldozer yang berfungsi menggaru batuan keras. Dan dengan menggunakan ripper pada pengupasan overdurden dapat meningkatkan produksi, meminimalkan biaya operasional khususnya penggunaan bahan bakar minyak dan biaya perawatan peralatan alat gali muat
Tingkat keberhasilan reklamasi lahan bekas tambang batubara pada PT Bukit Baiduri Energi Kabupaten Kutai Kartanegara kota Samarinda Kalimantan Timur Aipassa, Marlon Ivanhoe; Zainuddin, Zainuddin; Hasan, Harjuni
Dinamika Lingkungan Indonesia Vol 7, No 2 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (372.213 KB) | DOI: 10.31258/dli.7.2.p.102-110

Abstract

Kartanegara Regency and Samarinda City East Kalimantan. From the results of the research and evaluation of the reclamation plan documents and RKTTL, as well as the reclamation implementation report, the Backfilling plan for 2017 is 35.80 Ha and is realized at 22.36 Ha, so that the percentage of success rates reaches 62,46%. The land management and land revegetation plan for 2017 is 62.12 Ha and is realized at 10.26 Ha, so that the percentage of success rate is 16.52%. Revegetation of PT BBE land for the last 3 (three) years from 2015-2017 with a plan of 165.17 Ha and realized as much as 129.05 Ha, resulting in a percentage of success rate of 78.13%, but when compared with the total realization of reclamation (land arrangement ) amounting to 109.06 Ha, realization of revegetation 129.05 Ha, then the success rate of revegetation of reclaimed land is 118.33%. This shows that PT BBE's commitment to environmental management is quite good. Based on the results of laboratory analysis, water quality at all outlet points of PT BBE compliance still meets environmental quality standards of pH 6-7 (BML 6-9). While the soil quality of top soil does not meet environmental quality standards (soil pH 3.68). Based on the overall evaluation results, the percentage of successful reclamation implementation at PT BBE is 78.43% (categorized as moderate).
Disposal slope design based on low-plasticity rock’s shear strength in coal mining activities Harjuni Hasan; Revia Oktaviani; Tommy Trides; Dionisyus Fransiskus Sinaga
Journal of Degraded and Mining Lands Management Vol 10, No 1 (2022)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2022.101.3821

Abstract

Slope stability is the primary factor in designing a stable slope. The strength of the disposal slope relies on the characteristic of the dump materials. The rock shear strength denotes rock ability to withstand the burden, both constant and dynamic load. The weakest material used as a reference in designing the disposal slope is siltstone in Pulaubalang formation (location-04). The safety value in Location 04 and 02 tend to drop quickly as the inclination increase, while the safety in location 01 and 03 tend to fall slowly. This indicates that rocks with a lower plasticity index tend to be stronger in steeper slope conditions. The slope geometry was designed to be 10, 15, 20, and 25 meters high with a slope angle of 10o, 15o, 20o, 25o, 30o, 35o, 40o, 45o, 50o, 55o, and 60o. The slope geometry is considered stable and safe. However, this study suggests that the most effective slope design is the slope with 25 meters high, overall slope of 25,3o; the single slope of 35o; berm width 4,66 meters, bench height of 5 meters, with the safety factor value of 4.30 (SF= 4.30).
STUDI PENCAMPURAN BATUBARA KUALIATAS RENDAH DENGAN ARANG GERGAJI KAYU SENGON PADA PROSES PEMBUATAN BRIKET Donal Donal; Harjuni Hasan; Agus Winarno; Windhu Nugroho; Shalaho Dina Devy
JOURNAL TRANSFORMATION OF MANDALIKA (JTM) e-ISSN 2745-5882 p-ISSN 2962-2956 Vol. 3 No. 1 (2022): JOURNAL TRANSFORMATION OF MANDALIKA
Publisher : Institut Penelitian dan Pengembangan Mandalika Indonesia (IP2MI)

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Abstract

Tujuan dari penelitian ini adalah untuk mengetahui hasil analisis proksimate, uji kuat tekan dan penyalaan api serta laju pembakaran pada briket. Hasil penelitian menunjukkan bahwa jenis perekat dan biomassa berpengaruh nyata terhadap kadar air, kadar abu, zat mudah menguap, karbo tertambat, penyalaan api serta laju pembakaran, sedangkan tidak berpengaruh terhadap kerapatan dan kuat tekan. Perlakuan terbaik yang sesuai dengan standar SNI dari penelitian ini didapatkan dari perlakuan dengan komposisi 60% batubara : 40% arang sengon dan 50% batubara : 50% arang sengon dengan kode sampel KH dan KP perekat tepung tapioka. Briket dengan komposisi 60%batubara : 40% arang sengon kode sampel KH (Pulaubalang) yang dihasilkan dari perlakuan ini memiliki nilai kadar air 5,99 % ; kadar abu 6,92 % ; zat terbang 11,42%; kadar karbon tertambat 75,65%; laju pembakaran 3,74 g/menit ; nyala api 6 : 36 menit ; kerapatan 0,23 g/cm3 ; kuat tekan 38,22 kg/cm2. Briket dengan komposisi 50%batubara : 50% arang sengon kode sampel KP (Balikpapan) yang dihasilkan dari perlakuan ini memiliki nilai kadar air 6,96 % ; kadar abu 4,73 % ; zat terbang 11,92%; kadar karbon tertambat 76,39%; laju pembakaran 2,61 g/menit ; nyala api 6 : 57 menit ; kerapatan 0,21 g/cm3 ; kuat tekan 24.70 kg/cm2.
EVALUASI COAL RECOVERY PADA KEGIATAN PENAMBANGAN DARI PIT A MENUJU STOCKPILE DI PT. X (EVALUATION OF COAL RECOVERY IN MINING ACTIVITIES FROM PIT A TO STOCKPILE AT PT. X) Siti Maghfirah Azzahra; Harjuni Hasan; Revia Oktaviani; Agus Winarno; Lucia Litha Respati
JOURNAL TRANSFORMATION OF MANDALIKA (JTM) e-ISSN 2745-5882 p-ISSN 2962-2956 Vol. 3 No. 4 (2022): JOURNAL TRANSFORMATION OF MANDALIKA
Publisher : Institut Penelitian dan Pengembangan Mandalika Indonesia (IP2MI)

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Abstract

Several coal companies apply a minimum target of coal recovery. Coal recovery is a comparison between the actual tonnage of coal production based on the data from the weighbridge and the coal tonnage as a result of survey measurements expressed as a percentage. The greater the coal recovery more effective the coal was mined. Loss of coal during the mining process was unavoidable. However, if the cause is known in detail, the amount of loss can be minimized by making efforts to repair the existing causes and can increase the value of coal recovery and the utilization of coal reserves owned by the company. There are 30 coal mining data. 19 of them still had a coal recovery below 96% with a total tonnage loss of 1.485,97 tonnes. There are 6 activity criteria that cause coal recovery, including the coal getting less than optimal and still leaves coal on front which accounts for 47,45% of the total loss, coal used as road coating accounts for 5,67%, survey measurement data is less representative the appearance of coal shapes accounted for 2,48%, errors naming on coal haulage coupons accounted for 9,77%, waterlogged fronts accounted for 29,64%, and recleaning accounted for 5,01% of the total tonnage loss.
ANALISIS BIAYA PENAMBANGAN BATUBARA BERDASARKAN NISBAH PENGUPASAN PADA PT. PANCARAN SURYA ABADI KEC. MUARA BADAK KAB. KUTAI KARTANEGARA KALIMANTAN TIMUR (ANALYSIS OF COAL MINING COSTS BASED ON THE STRIPPING RATIO AT PT. PANCARAN SURYA ABADI DISTRICTS M Nurfaysa; Harjuni Hasan; Henny Magdalena; Sakdillah; Lucia Litha Respati
JOURNAL TRANSFORMATION OF MANDALIKA (JTM) e-ISSN 2745-5882 p-ISSN 2962-2956 Vol. 3 No. 4 (2022): JOURNAL TRANSFORMATION OF MANDALIKA
Publisher : Institut Penelitian dan Pengembangan Mandalika Indonesia (IP2MI)

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Abstract

Analysis of financial statements is an important step in assessing the value of the company. This research has a goal of determining mining costs based on the stripping ratio and the amount of profit obtained from the mining plan. In this study, the author uses an applied method with a quantitative analysis approach, where research demands the use of numbers, starting from data collection, interpretation of the data, and the appearance of the results which are presented in the form of mathematical calculation results. Coal production produced in 2021 is 305,100 MT/Year and Overburden production is 1,054,815 BCM/Year, so the coal production cost is Rp. 103,900.11/MT or $ 7.27/MT and an overburden fee of Rp. 41,176.94/BCM or $2.88/BCM. Based on the Reference Coal Price in 2021, after calculating the sales of domestic and export coal, the sales income of $26,532,614.30 for a year (2021) was obtained.
SINKRONISASI WORK ORDER OVERBURDEN REMOVAL ANTARA OWNER DENGAN KONTRAKTOR PT. KUTAI ENERGI KABUPATEN KUTAI KARTANEGARA PROVINSI KALIMANTAN TIMUR (Synchronization of Overburden Removal Work Order Between Owner and Contractor PT. Kutai Energy, Kutai Kartane Megawati AP; Harjuni Hasan; Agus Winarno; Tommy Trides; Lucia Litha Respati
JOURNAL TRANSFORMATION OF MANDALIKA (JTM) e-ISSN 2745-5882 p-ISSN 2962-2956 Vol. 3 No. 4 (2022): JOURNAL TRANSFORMATION OF MANDALIKA
Publisher : Institut Penelitian dan Pengembangan Mandalika Indonesia (IP2MI)

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Abstract

Common problems in mining activities of PT. RPP Contractors Indonesia is a non-compliance with the realization of the mining plan. This discrepancy was discovered after reconciling the mining progress map with the draft mining plan at the end of June 2022. This research is very important by synchronizing the realization of the plan at the end of the month. The aim is to determine the form of non-conformance, calculate the volume of non-conformance, and analyze the factors causing the non-conformance to the plan. The research method used is to synchronize work orders between the owner and the contractor by reconciling the actual data in the field with the mine plan design and scheduling the digging and loading equipment so that it shows the percentage of the suitability of the plan with the actual. The results showed that the achievement for overburden stripping was 70% consisting of 60% on design, 10% overcut, and 40% undercut. The factors causing the failure are the number of units and the placement of the fleet, unit productivity, and supervision.
Optimasi Konsumsi Fuel Dump Truck Terhadap Pengaruh Grade Jalan Pada Aktivitas Penambangan Pada PT. Pamapersada Nusantara Kecamatan Sangatta Utara Kabupaten Kutai Timur Mushawir Mushawir; Harjuni Hasan; Henny Magdalena
MINERAL Vol 7 No 2 (2022): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v7i2.3338

Abstract

The grade or slope of the road in a mining activity is certainly unavoidable. In addition to naturally following topographical contours, the shape of the mining pit is carried out from a high elevation leading to the lowest elevation following the slope level and the continuity of the excavation material makes the road should be made sloping. The high or low value of the road grade in addition to affecting the speed and travel time required by the unit, of course, also affects the level of fuel consumption. PT. Pamapersada Nusantara uses a conveyance unit with the HD Komatsu 785-7 type to move overburden material. Based on the results of the analysis, in the loaded condition, grade 2% uses 0.45 liters of fuel, 5% grades 0.77 liters, 6% grades 0.89 liters, 8% grades 1.09 liters and grades . While in the unloaded condition, grade 2% uses 0.19 liters of fuel, 5% grades 0.35 liters, 6% grades 0.4 liters, 8% grades 0.47 liters and 9% grades 0. 52 liters.
Studi Efek Skala pada Uji Kuat Tekan Uniaksial Terhadap Batupasir Pada Formasi Balikpapan Daerah Samarinda Utara, Provinsi Kalimantan Timur Milda Milda; Tommy Trides; Harjuni Hasan; Revia Oktaviani; Agus Winarno
MINERAL Vol 7 No 2 (2022): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v7i2.3352

Abstract

Scale effect testing on rocks is carried out with the aim of knowing the strength of a rock based on different dimensions. This test was carried out using a uniaxial compressive strength test and also testing the physical properties of rocks. In the rock compressive strength test used 5 dimensions of rock samples with a H/W ratio of which are 4.5/3, 6/3, 7.5/3 for dimensions of 3 cm, 5.25/3.5, 7 /3.5, 8.75/3.5 for dimensions 3.5 cm, 6/4, 8/4, 10/4, for dimensions 4 cm, 6.75/4.5, 9/4.5, 11.25/4,5 cm for the 4.5 cm dimension and for the 5 cm dimension, namely 7.5/5, 10/5 and 12.5/5. Physical properties testing is carried out to determine the porosity value in the test rock samples, which will then be compared between the porosity values ​​and the results of the compressive strength test of rock samples. Physical properties testing carried out obtained the average value of rock porosity, namely 22.562%, 22.122%, 20.454%, 21.227%, and 22.413%. In the scale effect test, it is known that the higher the rock sample, the smaller the value of the rock strength can be seen based on the R2 value obtained in the Balikpapan Formation, which is 0.0548.
DECREASE LEVELS OF IRON (Fe) AND MANGANESE (Mn) IN ACID MINING WATER USING ACTIVE CARBON OF EGG SHELL Sandri Tandi Rapang; Shalaho Dina Devy; Windhu Nugroho; Harjuni Hasan; Revia Oktaviani; Tommy Trides
Jurnal Chemurgy Vol 6, No 2 (2022): Jurnal Chemurgy-Desember 2022
Publisher : Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/cmg.v6i2.9290

Abstract

Acid mine drainage is acidic water that arises as a result of mining activities. Acidic water has a high acidity, which is often characterized by a low pH and contains high levels of heavy metals Fe and Mn. The purpose of this study was to determine the effect of activated carbon on the adsorption process and the effect of mass of activated carbon on eggshells. The method used in this research is the adsorption method using activated carbon of eggshell which is physically and chemically activated. This study used a mass variation of 5, 10, 15 and 20 grams with a contact time of 30 minutes and an adsorbent size of 200 mesh. The parameters studied were heavy metals iron (Fe) and manganese (Mn). The initial concentration of Fe acid mine waste was 29.179 mg/L, and Mn was 7.9692 mg/L. The results showed that the mass of activated carbon had an effect on decreasing the levels of Fe and Mn metals. On physical activation the average decrease in Fe metal was 99.50% and Mn metal was 53.21%, while on chemical activation the average decrease in Fe metal was 97.72% and Mn metal was 97.97%.Keywords: Acid mine water, Fe, Mn, Activated carbon, egg shell
Co-Authors Agus Winarno Agus Winarno Aipassa, Marlon Ivanhoe Akbar Ilham Albertus Juvensius Pontus Albertus Juvensius Pontus Devy, Shalaho Dina Dionisyus Fransiskus Sinaga Donal Donal Fery Ferdiansyah Gerry Tri Virgin Graciella Jacob Hamzah Umar Henny Magdalena Joe Vandame Sitepu Jumsar A Lucia Litha Respati Lumban Tobing Bill Rexy Megawati AP Milda Milda Mushawir Mushawir Narius , Nurfaysa Revia Oktaviani Rinto Syahreza Pahlevi Sakdillah Sakdillah A Sandri Tandi Rapang Siti Maghfirah Azzahra Tommy Trides Tommy Trides Tommy Trides Tommy Trides Vandrianus Felix Feto Nuwa Virgita Miranda Windhu Nugroho Windhu Nugroho windhu Yauri Imanuel Tobak Zainuddin Zainuddin