Optimalisasi Pemanfaatan Bijih Nikel Low Grade Saprolite dengan Metode Blending serta Analisis Perbedaan Kadar Ni dan Fe Hasil Temporary Ore Stockpile dan Hasil Product Ore Stockpile
DOI:
https://doi.org/10.29313/bcsme.v6i2.24255Keywords:
Blending, Cut-off Grade, Match Faktor, Nickel Saprolite, StockpileAbstract
Abstract. PT Weda Bay Nickel manages lateritic nickel ore with variable Ni grades, while low-grade saprolite is not always optimally utilized and grade differences may occur between the temporary ore stockpile (TOS) and the product ore stockpile (POS). This study determined an appropriate blending composition, calculated average grades, and evaluated differences in Ni, Fe, and wet metric tonnage (WMT). Block-model and stockpile data were processed using the sumproduct approach, descriptive comparison, grade differences, and match factor. In Dome A, 33% low-grade saprolite was blended with higher-grade material. The planned Ni grade was 1.52%, while the TOS result reached 1.65%, exceeding the company cut-off grade of 1.40% Ni. In ACM.721, Ni and Fe decreased from 1.63% and 19.46% to 1.52% and 18.36%, with a mass decrease of 1,829 WMT. In ABM.746, Ni decreased from 1.66% to 1.50%, whereas Fe increased from 17.17% to 18.20% and mass increased by 521 WMT. The changes were associated with ore heterogeneity, nonrepresentative sampling, stockpile management, rainfall, and excavator cleanliness.
Abstrak. PT Weda Bay Nickel mengelola bijih nikel laterit dengan kadar Ni yang bervariasi, sedangkan pemanfaatan material low grade saprolite belum optimal dan dapat terjadi perbedaan kadar antara temporary ore stockpile (TOS) dan product ore stockpile (POS). Penelitian ini bertujuan menentukan komposisi blending, menghitung kadar rata-rata, serta mengevaluasi perbedaan kadar Ni, Fe, dan massa dalam wet metric ton (WMT). Data block model dan stockpile diolah menggunakan pendekatan sumproduct, perbandingan deskriptif, selisih kadar, dan match factor. Pada Dome A, 33% material low grade saprolite dicampurkan dengan material berkadar lebih tinggi. Kadar Ni rencana sebesar 1,52%, sedangkan hasil TOS mencapai 1,65% dan melampaui cut-off grade perusahaan sebesar 1,40% Ni. Pada ACM.721, kadar Ni dan Fe turun dari 1,63% dan 19,46% menjadi 1,52% dan 18,36%, disertai penurunan massa 1.829 WMT. Pada ABM.746, kadar Ni turun dari 1,66% menjadi 1,50%, kadar Fe naik dari 17,17% menjadi 18,20%, dan massa bertambah 521 WMT. Perubahan tersebut berkaitan dengan heterogenitas ore, sampling yang tidak representatif, pengelolaan stockpile, curah hujan, dan kebersihan excavator.
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