Identifikasi Penyebaran Zona Mineralisasi Logam Emas (Au) Menggunakan Metode Induced Polarization Dan Magnetik Studi Kasus Lapangan “ADR” - PT ANTAM

Lapangan “ADR” merupakan dengan tipe lingkungan pengendapan emas epitermal sulfidasi tinggi yang dicirikan oleh kehadiran mineral penciri seperti quartz, smectite, dan kaolinite. Dalam penelitian ini dilakukan identifikasi zona persebaran mineralisasi untuk mengetahui potensi endapan mineral emas dibawah permukaan. Metode yang digunakan dalam identifikasi penyebaran zona mineralisasi emas adalah metode Induced Polarization (IP) domain frekuensi dan metode magnetik dengan mendapatkan respon dari nilai Percent Frequency Effect (PFE), resistivitas, dan anomali medan magnet di titik pengukuran. Pengolahan data IP dilakukan dengan inversi smoothness-constrained least-squares method, sedangkan untuk pengolahan data magnetik menggunakan filter reducing to pole dan upward continuation. Berdasarkan hasil pengolahan data, diketahui bahwa nilai resitivitas pada lapangan “ADR” berkisar antara 19 Ohm.m – 2.968 Ohm.m, nilai PFE berkisar antara 0,3 % – 15,8 % dan nilai suseptibilitas berkisar antara 0,00129 SI – 0,0191 SI dengan arah penyebaran zona mineralisasi emas tersebut dari arah barat laut – tenggara. Zona alterasi argilik pada lokasi penelitian dicirikan dengan nilai IP sedang-tinggi (> 6 %), resistivitas bernilai rendah-sedang ( 6 %), resistivitas sedang-tinggi ( > 600 Ohm.m ), dan suseptibilitas bernilai rendah (-0,00129 SI – 0 SI ) pada lintasan BL -800. ========================================================= “ADR” Area is high epidermal sulphidation type with alteration characteristic found in the form of quartz, smectite, and kaolinite. This study is aimed to identificate gold mineralization dispersion zone is identified to determine the potential of gold mineral deposits beneath the surface. The method used to detect the presence of gold epithermal deposits beneath the surface is the IP method of frequency domain and magnetic method. The combination of the two geophysical by obtaining responses from Percent Frequency Effect (PFE), resistivity, and magnetic field anomalies at the point of measurement. The IP method results were then processed with inversion smoothness-constrained least-squares method, which then created the 2D model. Magnetic methods processing use reduce to pole filter and upward continuation filter. The results from mentioned methods, it is known that the value resitivity ranges 19 Ohm.m – 2.968 Ohm.m, PFE value ranges 0,3 % – 15,8 % and the value of susceptibility ranges -0,00129 SI – 0,0191 SI with the gold mineralization zone spreads to the northwest - southeast direction. The argillic alteration zone is characterized by medium-high IP values (> 6%), low-moderate resistivity ( 6%), medium-high resistivity (> 600 Ohm.m), and susceptibility ranges with low values (-0,00129 SI – 0 SI ) at BL -800