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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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Journal : techno lppm

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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.
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