COMPARATIVE STUDY BETWEEN THE METHODS OF NEAREST NEIGHBORHOOD POINT (NNP), INVERSE DISTANCE WEIGHT (IDW) AND KRIGING ON THE COMPUTATION OF LATERITE NICKEL RESERVE

• Main Author: ABDUL LATIF (NIM 22105002), ANAS
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/7183
• Institution: Institut Teknologi Bandung

This research aims at obtaining a method with better accuracy based on the results of comparing several computation methods. In this paper, the methods used are: Nearest neighborhood Point (NNP), Inverse Distance Weight (IDW) and kriging. The computation of this laterite nickel reserve is limited by the Cut of Grade (Cog); for limonite nickel, the composition of Ni &#8805; 1.2% and Fe &#8805; 25%; for saprolite, the composition of Ni &#8805; 1.8% and Fe &#8804; 25%. The result of calculating limonite using NNP method was 888,750 tons, using IDW 857,820 tons, and using kriging 924,590 tons. Moreover, the result for saprolite using NNP was 3,045,700 tons, using IDW 3,087,370 tons, and using kriging method 2,922,540 tons. Based on the visual observation on two sections, namely East-West crossing and North-South crossing from the three methods, it can be concluded that the most readily observable methods, IDW and NNP can be implemented for computing the laterite nickel reserves in Pulau Gee, since the sections can approximate the original ones. On the scatterplot of the limonite for NNP, the value of R is approximately one. For saprolite, the value of R equals one. This shows that laterite nickel sediments are distributed evenly, thus in the search radius of 10 m from the drill point, we can obtain relatively similar values of thickness and compositions. <br /> <br />