TY  - UNPB
UR  - https://repository.itny.ac.id/id/eprint/5357/
ID  - ITNYREPOID5357
Y1  - 2023/02/02/
AV  - restricted
N2  - PT Gag Nickel is a nickel mining company located in Papua, especially in Raja Ampat Regency. Nickel laterite is one of the metallic minerals resulting from the chemical weathering process of ultramafic rocks. To determine the quality and distribution of nickel laterite mineral deposits in the field, a grade assessment is required for collecting data on the quality and quantity of mineral deposits from exploration activities in the field. There are many methods that can be applied, but in this study the authors only focused on 2 methods, namely the Inverse Distance Weighting (IDW) and Nearest Neighborhood Point (NNP) methods. This study aims to determine the amount of nickel deposit resources in the study area using 2 interpolation methods, namely the Inverse Distance Weighting (IDW) and Nearest Neighborhood Point (NNP) methods, and determine the best method of the two methods used in this study. Before starting the estimation activity, data composite activities were carried out on the grade data (assay) to make the average grade per 1 meter in each drill hole. After that, content assessment was carried out using the two methods used. The results of the assay obtained will then be used to determine the best method for evaluating interpolation of content data using the Root Mean Square Error (RMSE) method where the smallest RMSE value is the best method used. After the grade interpolation activities have been carried out, the grade interpolated data is then used to estimate resources which is carried out using the help of software where the distribution of the grade interpolated data at each point will be made in the form of a block model, the dimensions are 25x25x1 m and the Blockmodel sub is 6.25x6.25x1 m. Based on the results of the estimated resource obtained, it is known that the Inverse Distance Weighting (IDW) power 1 (ID) method obtained a volume of 579.805,00 m3, a tonnage of 890.745,00 tons, and an average grade of 1.71%, on the method Inverse Distance Weighting (IDW) power 2 (IDS), obtained a volume of 573.790,00 m3, a tonnage of 881.697,00 tons, and an average grade of 1.77%, in the Inverse Distance Weighting (IDW) power 3 (IDC) method, obtained a volume of 566.135,00 m3, a tonnage of 870.165,00 tons, and an average grade of 1.8 %, the Nearest Neighborhood Point (NNP) method obtained a volume of 847.734,00 m3, a tonnage of 1.308.705,00 tons, and average content of 1.96%. Based on the evaluation of the interpolation results in the limonite zone, the values obtained in each zone are in the limonite zone where the smallest RMSE value is obtained by the Nearest Neighborhood Point (NNP) method with an RMSE value of 0.0387, while in the saprolite zone where the smallest RMSE value is obtained by the Inverse Distance Weighting method (IDW) power 2 (IDS) with an RMSE value of 0.24336 = PT Gag Nikel merupakan salah satu perusahaan tambang nikel yang berada di Papua khususnya di Kabupaten Raja Ampat. Nikel laterit merupakan salah satu mineral logam hasil dari proses pelapukan kimia batuan ultramafik. Untuk menentukan kualitas dan sebaran endapan mineral nikel laterit di lapangan diperlukan kegiatan interpolasi kadar yang dilakukan untuk mengumpulkan data mengenai kualitas dan kuantitas endapan mineral dari kegiatan eksplorasi di lapangan. Ada banyak metode yang dapat diaplikasikan akan tetapi dalam penelitian ini penulis hanya berfokus pada 2 metode yaitu metode Inverse Distance Weighting (IDW) dan Nearest Neighborhood Point (NNP). Penelitian ini bertujuan untuk menentukan jumlah sumberdaya endapan nikel di daerah penelitian dengan menggunakan 2 metode interpolasi yaitu metode Inverse Distance Weighting (IDW) dan Nearest Neighborhood Point (NNP), dan menentukan metode terbaik dari kedua metode yang digunakan pada penelitian ini. Sebelum memulai kegiatan estimasi, terlebih dahulu dilakukan kegiatan komposit data pada data kadar (assay) untuk membuat kadar rata-rata per 1 meter pada tiap lubang bor. Setelah itu, dilakukan kegiatan penaksiran kadar menggunakan kedua metode yang dipakai. Hasil penaksiran kadar yang didapat kemudian akan digunakan untuk menentukan metode terbaik pada kegiatan evaluasi interpolasi data kadar menggunakan metode Root Mean Square Error (RMSE) dimana nilai RMSE terkecil merupakan metode terbaik yang dipakai. Setelah dilakukan kegiatan interpolasi kadar, data hasil interpolasi kadar selanjutnya digunakan untuk mengestimasi sumberdaya yang dilakukan dengan menggunakan bantuan software dimana sebaran data hasil interpolasi kadar tiap titik akan dibuat dalam bentuk Blockmodel, untuk dimensinya adalah 25x25x1 m dan sub Blockmodel adalah 6,25x6,25x1 m. Berdasarkan hasil dari estimasi sumberdaya yang didapat, diketahui bahwa pada metode Inverse Distance Weighting (IDW) power 1 (ID), didapatkan volume sebesar 579.805,00 m3, tonase sebesar 890.745,00 ton, dan kadar rata-rata sebesar 1.71%, pada metode Inverse Distance Weighting (IDW) power 2 (IDS), didapatkan volume sebesar 573.790,00 m3, tonase sebesar 881.697,00 ton, dan kadar rata-rata sebesar 1.77%, pada metode Inverse Distance Weighting (IDW) power 3 (IDC), didapatkan volume sebesar 566.135,00 m3, tonase sebesar 870.165,00 ton, dan kadar rata-rata sebesar 1.8%, pada metode Nearest Neighborhood Point (NNP) didapatkan volume sebesar 847.734,00 m3, tonase sebesar 1.308.075,00 ton, dan kadar rata-rata sebesar 1.96%. Berdasarkan evaluasi hasil interpolasi pada zona limonit, Nilai yang didapat pada tiap zona yaitu pada zona limonit dimana nilai RMSE terkecil didapat pada metode Nearest Neighborhood Point (NNP) dengan nilai RMSE 0.0387, sedangkan pada zona saprolit dimana nilai RMSE terkecil didapat pada metode Inverse Distance Weighting (IDW) power 2 (IDS) dengan nilai RMSE 0.24336.
A1  - SARIF, SYAHRUL BUDIMAN
PB  - Institut Teknologi Nasional Yogyakarta
KW  - resources
KW  -  estimation
KW  -  IDW
KW  -  NNP
KW  -  RMSE = sumberdaya
KW  -  estimasi
KW  -  IDW
KW  -  NNP
KW  -  RMSE
M1  - other
TI  - Estimasi sumberdaya nikel menggunakan metode inverse distance weighting dan   nearest neighborhood point pada bukit  x PT Gag Nikel, Pulau Gag, Kab. Raja  Ampat, Provinsi Papua Barat Daya
ER  -