Kurniawan, Achmad Reza and Amri, Nur Ali (2019) Estimasi Sumberdaya Emas Menggunakan Metode Ordinary Kriging Pada Pit X, Pt. Indo Muro Kencana, Kec. Tanah Siang,Kab. Murung Raya, Kalimantan Tengah. In: PROSIDING Rekayasa Teknologi Industri dan Informasi ISSN : 1907-5995 R Revolusi Industri 4.0 : Peluang dan Tantangan Terkini bagi Technopreneur, 2 November 2019, Institut Teknologi Nasional Yogyakarta.
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Abstract
Penelitian bertujuan untuk menganalisis penyebaran kadar sumberdaya emas epithermal low sulphidation berdasarkan metode geostatistik ordinary kriging. Daerah penelitian (Pit X) terletak di Kecamatan Tanah Siang, Kabupaten Murung Raya, Provinsi Kalimantan Tengah yang merupakan milik PT. Indo Muro Kencana. Data adslsh 569 titik bor dengan spasi 8 meter dan pengambilan sampel assay emas epithermal per 1 meter. Metode geostatistik yang digunakan antara lain metode median indicator kriging dan ordinary kriging. Parameter penaksiran kadar sumberdaya emas epithermal didasarkan pada studi variogram dan crossvalidation dari dua metode geostatistik yang digunakan. Penelitian ini menggunakan software Micromine 2018. Metode ordinary kriging menggunakan prinsip block kriging dan metode median indicator kriging menggunakan kadar batas nilai tengah atau median masing-masing vein untuk menaksirkan jumlah sumberdaya emas epithermal. Hasil crossvalidation dari penaksiran sumberdaya emas epithermal menunjukkan metode median indicator kriging mempunyai nilai koefisien korelasi (r) 0.587 dan root mean squared error (RMSE) 0,097 lebih akurat dibandingkan metode ordinary kriging yang mempunyao nilai koefisien korelasi (r) 0.103 dan root mean squared error (RMSE) 0.875. Klasifikasi sumberdaya emas epithermal didasarkan pada jarak rata-rata antar sampel yang ditunjukkan pada histogram. Hasil penaksiran kadar sumberdaya metode ordinary kriging memperoleh sumberdaya terukur 27607 ton dengan kadar ratarata 2.237 Au ppm dan sumberdaya tertunjuk 5092 ton dengan kadar rata-rata 3.376 Au ppm dan sumberdaya tereka 40317 ton dengan kadar rata-rata 1.8 Au ppm. Kata kunci: Sumberdaya, Geostatistik, Variogram, Kriging, Median Kriging, Vein Epithermal Low Sulphidation ABSTRACT The purpose of research is to analyze the grade distribution of gold epithermal vein low sulphidation resource based on geostatical ordinary kriging. The research area (Pit X) is located in Tanah Siang subdistrict, Murung Raya regency, Central Borneo. The research area belongs to mining owner company PT. Indo Muro Kencana. The data are 569 drillholes with drillhole spacing is 8 meters and sampling 1 meter per gold gold epithermal assay. Geostatistical methods consist of two methods, median indicator kriging and ordinary kriging. The parameters of grade estimation gold epithermal are based on variogram study and the result of crossvalidation of two geostatistical methods. The research is conducted by using Micromine 2018. Ordinary kriging based on block kriging methods while median indicator kriging with the median value for each vein is used for the estimation of gold epithermal resources. The result of the crossvalidation shown that median indicator kriging with coef icient of corelation (r) value 0.587 and root mean squared error (RMSE) value 0.097 is more accurate method than ordinary kriging with coef icient of correlation (r) value 0.103 and roor mean squared error (RMSE) value 0.857. The classification of gold ephitermal resources is based on value of avarage distance of samples by looking to its histogram. The results of gold epithermal resources based on its avarage distance of samples value of ordinary kriging methods has measured resource with 27607 tons and the avarage grades is 2.237 Au ppm, indicated resource with 5092 tons and the avarege grades is 3.376 Au ppm, and inferred resource with 40317 tons and the avarage grades is 1.8 Au ppm. Keywords : Resource, Geostatistics, Variogram, Kriging, Median Kriging, Vein Epithermal Low Sulohidation
| Item Type: | Conference or Workshop Item (Paper) |
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| Uncontrolled Keywords: | Resource, Geostatistics, Variogram, Kriging, Median Kriging, Vein Epithermal Low Sulohidation |
| Subjects: | T Technology > TN Mining engineering. Metallurgy |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Dr. ST. MT Nur Ali Amri |
| Date Deposited: | 19 Nov 2021 12:10 |
| Last Modified: | 19 Nov 2021 12:10 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/27091 |
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