Identification of Porphyry Deposits Based on Aeromagnetic Data, Magnetic Susceptibility, and Mineralization in Prospect "x"

Porphyry deposits are formed through magmatic-hydrothermal processes related to the intrusion of intermediate to felsic igneous rocks. These deposits are among the world's major sources of metals, particularly copper, gold, and molybdenum. Their formation is typically associated with magmatic arc environments, such as the eastern part of the Sunda Arc. The mineralization potential in this region has encouraged further exploration activities, including at the 'X' prospect, operated by PT Bumi Suksesindo (BSI) in Banyuwangi Regency, which is the main focus of this research. The objective of this study is to determine the distribution of magnetic anomalies based on aeromagnetic surveys and to identify the spatial pattern of porphyry-Type mineralization using magnetic susceptibility modelling, along with molybdenum (Mo) and iron (Fe) content. Data were acquired using a DJI Matrice 600 Pro drone equipped with GSM-19/19F and GSMP-35U magnetometers, yielding 405,601 aeromagnetic data points. Susceptibility measurements were conducted using a KT-10R S/C meter, complemented by geochemical laboratory analyses. The datasets were processed to produce a regional magnetic anomaly map, analytic signal map, 3D magnetic inversion model, and 3D mineralization distribution model. The results indicate a circular high magnetic anomaly in the central area, suggesting the presence of magnetite in the potassic core zone. A strong correlation between 3D magnetic modelling, susceptibility, and Mo content is observed in section RS, while weaker correlations in sections VW and XY are attributed to data gaps. This study contributes to the development of more efficient porphyry exploration strategies.