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All Journal Techno LPPM Prosiding Seminar Nasional Sains dan Teknologi Terapan Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII
Nur Ali Amri
Universitas Pembangunan Nasional Veteran Yogyakarta
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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MULTI CRITERION PRIORITY ON KRIGING OF GOLD RESOURCES PREDICTION Nur Ali Amri; Waterman Sulistyana Bargawa; Tedy Agung Cahyadi
Techno LPPM Vol 7, No 2 (2021)
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

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This paper describes of three things. First, the Kriging estimation on gold grade which is distributed in the vein. The empirical variogram method based on Matheron classical and robust of Cressie-Hawkins. The two empirical fitting on variogram theory of spherical and exponential equations of weighted least squares and ordinary least squares used. The predictions of six sizes block-Kriging respectively, 15×15, 25×25, 35×35, 50×50, 75×75 and 100×100 based on four variographic models. Second, determine the priority of 24 prediction combinations based on TOPSIS method. Finally, the multiple criterion decision making method namely, 15×15 block Kriging based on a robust empirical variogram of exponential weighted least squares model represents as the best result.
RANCANGAN TEKNIS KEMAJUAN PENAMBANGAN PADA PENAMBANGAN BATUBARA DI PT. SARANA MAKMUR BERSAUDARA KALIMANTAN TIMUR I Gede Dion Pramana Utama; Waterman Sulistyana Bargawa; Nur Ali Amri
Prosiding Seminar Nasional Sains dan Teknologi Terapan 2021: Peluang dan Tantangan Peningkatan Riset dan Teknologi di Era Pasca Covid-19
Publisher : Institut Teknologi Adhi Tama Surabaya

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PT. Sarana Makmur Bersaudara mengalami peningkatan target produksi sebesar 520.000 ton/tahun, 1.100.000 ton/tahun, dan 1.800.000 ton/tahun yang diakibatkan oleh meningkatnya permintaan pasar pasar. Akibat meningkatnya target produksi memunculkan permasalahan yaitu diperlukan klasifikasi model sumberdaya batubara, menentukan arah penambangan pada Blok Timur, dan merekomendasikan simulasi rancangan. Metode penelitian ini meliputi studi literatur, observasi lapangan dan pengamatan alat mekanis. Model lapisan batubara, rancangan akhir penambangan, dan kemajuan penambangan dibuat menggunakan software Minescape 5.7 dan perhitungan jumlah kebutuhan alat menggunakan Microsoft Excel 2010. Penelitian pada Blok Timur menghasilkan model sumberdaya batubara dengan klasifikasi sumberdaya tertunjuk. Arah penambangan dilakukan dari selatan ke utara dikarenakan dimensi lapisan batubara di daerah selatan lebih dekat dengan permukaan bumi dan arah kemiringan lapisan ke arah utara. Berdasarkan hasil perancangan desain tambang, didapat simulasi: (i) Rancangan I dengan target produksi batubara 524.000 ton/tahun, OB sebesar 880.000 bcm/tahun, dan SR 1,6:1; (ii) Rancangan II dengan target produksi batubara 848.000 ton/tahun, OB sebesar 2.396.000 bcm/tahun dan SR 2,1:1; dan (iii) Rancangan III dengan target produksi batubara 1.864.000 ton/tahun, OB sebesar 4.893.000 bcm/tahun, dan SR 2,6:1. Berdasarkan HBA pada Juli 2021 sebesar 115,35 USD/ton, direkomendasikan rancangan III dengan total pendapatan sebesar 217.108.000 USD.
Penerapan Metode Constructed Wetland dalam Upaya Pengelolaan Limbah Air Asam Tambang pada Penambangan Batubara , Berdasarkan Literatur Review Andrawina Wina; Rika Ernawati; Tedy Agung Cahyadi; Waterman SB; Nur Ali Amri
Retii 2020: Prosiding Seminar Nasional ReTII ke-15
Publisher : Institut Teknologi Nasional Yogyakarta

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An important problem that often occurs due to open pit mining activities from coal mining is the problem of acid mine drainage. Acid mine drainage is formed due to the oxidation of sulfide minerals that are exposed to the outside and then mixes with water, resulting in acidic water and also acid mining water often contains suspended solids that have high concentrations. This acidic mining waste can cause corrosion and dissolve metals so that contaminated water is toxic and can destroy aquatic life. Handling of acid mine drainage as passive treatment with constructed wetland methods is often applied to acid mine drainage treatment in several coal mining companies. By applying the method of constructed wetlands in the handling of acid mine drainage, it is effective in increasing the pH value and reducing the dissolved heavy metal content. This research is to find a management method for acid mine drainage using the constructed wetland method, so it is reviewed again to assist the management process of acid mine drainage by passive treatment with the constructed wetland method. The review was conducted to compare the management method of acid mine drainage with the constructed wetland method and to find out the advantages and disadvantages of swamp plants used in the artificial wetland method.
DIGGING TIME DECREASION ON THE BLASTING OF OVERBURDEN; EXPLOSION GEOMETRY OVERVIEW Nur Ali Amri; Michael Keenlie; Raden Hariyanto; Berryl Afkar Muhammadi
Techno LPPM Vol 9, No 1 (2023)
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

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This study aimed to evaluate the geometric design the P80 or Passing 80% of rock fragments and the digging time of equipment for sandstone overburden blasting with rock density, 2.43 kg/m3. As a basis for the results of observations on the current geometric design with a burden of 9 m, spacing of 9 m, and a depth of blast holes of 8 m, problems were found in the results of rock fragments that did not meet the criteria with the size of the rock fragments P80, 79.24 cm, the digging time of loading, 13.03 second and an average powder factor of 0.24 kg/m3. To obtain more uniform rock fragments is to improve the blasting geometry, so the energy distribution can be even that rock fragments and better digging time can be obtained in sandstone. The blasting geometry design which is proposed to improve fragmentation, 8 m; burden, 9 m; spacing; 3.5 m stemming; and 8 m blast hole depth with a column filled explosives of 4 m and the number of perforated explosives is 163.2 Kg, with powder factor, 0.28 kg/m3. The proposed blasting geometry produces suitable rock fragment. P80 is 39.93 cm and average digging time of 10.61 seconds.
RESOURCE ESTIMATION OF LATERITE NICKEL USING INVERSE DISTANCE WEIGHTING METHOD CASE STUDY OF NORTH KONAWE DISTRICT, SOUTHEAST SULAWESI PROVINCE Sofiannur Sofiannur; Eddy Winarno; Nur Ali Amri; Abdul Jalil
Techno LPPM Vol 9, No 1 (2023)
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

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The mining industry's estimation of mineral resources is a stage that is carried out to determine the quantity of a mineral. This study aimed to determine the selection of laterite nickel resource estimation methods. The determination of the estimation method is based on the value of the coefficient of variance and the geological conditions of the mineral deposits. This research area is in Lasolo Kepulauan District, North Konawe Regency at PT—x block south. Statistical analysis found that the coefficient of variance in the limonite zone was 0.19, the saprolite area was 0.37, and it was included in moderate geological geometry conditions. The estimation method used in this research is the inverse distance weighting method. The estimation results in the limonite zone are 3,398 tons with an average Ni content of 0% Ni, 448,037 tons with a moderate Ni content of 1.32%, 588,256 tons with an average Ni content of 1.65%, and 14,912 tons with an average Ni content of 2.01%. In comparison, in the saprolite zone, there are 174.46 3 tons with a middle grade of Ni of 0.84%, 408,896 tons with an average quality of Ni of 1.26%, 788,818 tons with moderate content of Ni of 1.77%, 771,709 tons with a middle grade of Ni of 2.21%, 172,236 tons with an average quality of Ni of 2.63%, and 5,215 tons with an average rate of Ni of 3.04 %.
Co-Authors Abdul Jalil Andrawina Wina Berryl Afkar Muhammadi Cahyadi, Tedy Agung Eddy Winarno I Gede Dion Pramana Utama Michael Keenlie Raden Hariyanto Rika Ernawati Sofiannur Sofiannur Waterman SB Waterman Sulistyana Bargawa