Article Per Year (5 Year)
p-Index From 2021 - 2026
0.408
P-Index
This Author published in this journals
All Journal Jurnal Riset Multidisiplin Edukasi
Irfan Marwanza
Program Studi Teknik Pertambangan, Fakultas Teoknologi Kebumian dan Energi, Universitas Trisakti, Jakarta, Indonesia
Other

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
ESTIMASI SUMBER DAYA NIKEL LATERIT MENGGUNAKAN METODE INVERSE DISTANCE WEIGHT (IDW) PADA PT X, MALUKU UTARA Juan D E Nanlohy; Irfan Marwanza; Taat Tri Purwiyono
Jurnal Riset Multidisiplin Edukasi Vol. 3 No. 8 (2026): Jurnal Riset Multidisiplin Edukasi (Agustus 2026)
Publisher : PT. Hasba Edukasi Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71282/jurmie.v3i8.2505

Abstract

Mineral resource estimation is a fundamental stage in mine planning that determines the economic viability of a deposit. This study aims to estimate laterite nickel resources using the Inverse Distance Weighting (IDW) method at a deposit in PT X, North Maluku, through an integrated approach encompassing variogram analysis, strict geological domain separation, and quantitative validation. The data consist of secondary exploration drilling data from 42 drill holes, including collar, survey, assay (Ni, Fe, SiO2), and lithology. Data processing was carried out using Leapfrog for wireframe geological modeling, Snowden Supervisor for statistical and variography analysis, and Isatis.neo for compositing, block modeling, and IDW estimation. Limonite and saprolite domains were separated using hard boundary. Estimation results show a total nickel resource of 9,878.87 tonnes, comprising 3,469.31 tonnes in the limonite zone (Ni grade 1.11%) and 6,409.56 tonnes in the saprolite zone (Ni grade 1.90%). Cross-validation yielded IDW correlation coefficients ranging from 0.69 to 0.76, with Ni Root Mean Square Error (RMSE) of 0.24 for limonite and 0.50 for saprolite. The resulting IDW block model realistically represents grade distribution in accordance with laterite genesis principles and can serve as a reference for subsequent mine planning.
PENGARUH DILUSI TERHADAP VARIASI KADAR NIKEL (NI) PADA PROSES PENAMBANGAN NIKEL LATERIT DI PT X, SULAWESI TENGGARA I Putu Benayaka Hananduta; Irfan Marwanza; Suliestyah
Jurnal Riset Multidisiplin Edukasi Vol. 3 No. 8 (2026): Jurnal Riset Multidisiplin Edukasi (Agustus 2026)
Publisher : PT. Hasba Edukasi Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71282/jurmie.v3i8.2510

Abstract

Dilution is one of the main factors affecting nickel grade variation during lateritic nickel mining because it causes the mixing of ore with low-grade ore or waste material, resulting in a reduction in ore quality. This study aimed to analyze the effect of dilution on nickel (Ni) grade variation during the lateritic nickel mining process at PT X, Southeast Sulawesi, and to identify the operational factors contributing to dilution. A quantitative descriptive method with an ex post facto approach was employed by comparing nickel grades obtained from test pit sampling and stockpile re-sampling. A total of 20 test pit samples and 20 stockpile samples were analyzed using X-Ray Fluorescence (XRF). The results showed that the average nickel grade decreased from 1.427% Ni in the test pit to 1.377% Ni in the stockpile, with an average difference of 0.050% Ni, indicating that dilution occurred during the mining and material handling processes. Field observations revealed that relatively narrow mining faces, inadequate implementation and supervision of selective mining along the ore boundary, and water accumulation on the pit floor were the main operational factors contributing to dilution. The findings indicate that nickel grade variation is influenced not only by the characteristics of the ore deposit but also by the effectiveness of operational control during mining activities. Therefore, improving grade control practices and implementing more effective selective mining are essential to minimize dilution and maintain consistent nickel ore quality throughout the mining process.
Co-Authors I Putu Benayaka Hananduta Juan D E Nanlohy Suliestyah Taat Tri Purwiyono