MODELING GEOLOGICAL OF PORPHYRY DEPOSIT AT X AREA BY USING 3D OPTIMIZATION METHOD (3DOPT)

• Main Author: TAUFAN ANDREW SYAH REZA (NIM : 12105080); Pembimbing : M. Nur Heriawan, ST., MT., Ph.D., RAJA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/19216
• Institution: Institut Teknologi Bandung

Modeling is one of crucial activities in describing form of geological geometry domain of a extractive deposit. A geological model is expected to be close to the original condition, thus approach which is applying particular method is required. One of the methods that can be utilized is 3D Optimization Method (3DOPT). In this research, 3DOPT is applied to illustrate porphyry deposit at area X. This method interpolates data in 3D by adopting trilinear interpolation principle. This method illustrates categorically a geometrical deposit by exerting rock code data. From research data, it can be found that there are 8 groups of Rock code which are Deep Diorite (0), Deep Fragmental (1), Sulphide Zone (2), River Intrusion (3), Main Giant Intrusion (4), Other Intrusion (5), Sediment (6), and Volcanic (7). These rock code data will be transformed into pairs of data of 0 and 1 (binary data). Number 1 is used to rock code which presents, while others are labeled as number 0, so that there will be 8 types of data pairs of number 0 and number 1 for each group of rock code. The 8 data pairs will be processed one by one into 3DOPT after the parameters wanted are put into. The output which is <br /> <br /> <br /> produced is coordinate data at every grid and a value of probability which is then is inquired the highest probability value for each rock code from the outcome of <br /> <br /> <br /> 3DOPT. The model will be visualized with the assistance of SGeMS (Stanford Geostatistical Modeling Software) program. <br /> <br /> <br /> The model produced is sufficient enough to describe model of geological geometry of porphyry deposit in research area, after compared with the real model, although there are still some limitations from the model generated. In addition, the model is compared with a model from the result of manual correlation. Model with manual correlation is more representative in illustrating geometry of porphyry deposit at research area. There is a big difference in number of rock code proportion from the initial data and data from 3DOPT output. From the computation of Diorite ore body resources, tonase total of 6,9 billion ton is obtained.