MODELLING 2D RESISTIVITY TO DETERMINE THE DISTRIBUTION AREA OF EPITHERMAL GOLD DEPOSIT IN ‘MILA’ FIELD

• Main Author: Fawwaz, Faris
• Format: Final Project
• Language: Indonesia
• Subjects: Pertambangan dan operasi berkaitan
• Online Access: https://digilib.itb.ac.id/gdl/view/37026
• Institution: Institut Teknologi Bandung

For gold deposit exploration, geophysical method has a significant role in identifying the prospective zones. Geophysical methods can be used to map formation’s subsurface structures and its distribution area to locate the mineralization zones that are associated with gold deposits. Gold deposits are indicated by the silicification zones related to the process of alterations. These zones tend to have higher resistivity compared to the surrounding area. One of the geophysical methods that can be used to map the gold mineralization zones is resistivity method. This method measures the potential difference by injecting electrical current into the ground through a pair of electrodes. From this measurement, variation of electrical potential difference will indicate resistivity variation that carries information regarding the structures and materials in which the current flows through. This principle assumes that earth’s material has resistive properties similar to resistors where the materials have different ability to conduct electrical current. This research takes place in MILA field located in Pani, north arm of the Sulawesi (Celebes) Island, using the Zonge series instrument with dipole-dipole electrode configurations. The survey was conducted on 9 East-West line with distance between line is 100 m and electrode distance is 50 m. After the acquisition, 2D modelling and 3D imaging of subsurface resistivity modelling is carried out. Then, the interpretation of the resulting 2D model and 3D image are performed. The final result of this research is the area of gold deposit’s distribution zones that is located in two separate zone, first on the middle area of research locations spread to the south and narrowing to the northwest and second to the northeast of the study areas.