PEMODELAN 2,5 DIMENSI DAN ANALISIS DEKONVOLUSI EULER UNTUK MENENTUKAN ZONA MINERALISASI PADA LAPANGAN SAWAHAN, GUNUNG DAHU, BOGOR, JAWA BARAT

SENTANU, FARHAN BINA, Eddy Hartantyo

2016 | Skripsi | FMIPA

Sawahan Field is located in Pongkor gold-silver mine operated by PT Aneka Tambang (Persero) Tbk which has been active since 1994 and has annual production 2 tons of Au and 20 tons of Ag. Mineral exploration in Sawahan Field is expected to result in major new discovery which can be Pongkor gold-silver mine new reserve. The magnetic method is a geophysical method which deals with mineral exploration. Magnetic data acquisition is done by employing Proton Precission Magnetometer to measure geomagnetic field. Geomagnetic field data has been done in Sawahan Field, Dahu Mountain, Bogor Regency, West Java at May 9th – July 3rd 2015 in area as wide as 1500 x 2500 m with 25 m measurement point spacing. The data processing is done by subtracting the magnetic field data with earth’s and celestial magnetic field to get the total magnetic anomaly. Regional anomaly is obtained by upward continuation to 163 m above ground level based on spectral analysis. After that the regional anomaly data is analysed by creating 2.5 D model and finding Euler Deconvolution solutions. Regional anomaly map that is overlayed by Euler Deconvolution solutions is used in qualitative data interpretation, while 2.5 D magnetic model is used in quantitative data interpretation. By doing both of qualitative data interpretation and quanitative data interpretation, the expected mineralization area can be determined. The Mineral propect area in Sawahan Field is shown by narrow Euler Deconvolution solutions and regional magnetic anomaly both of high anomaly and low anomaly. While the euler deconvolution solutions which is interpreted as mineral prospect area along A-B line are located at the distance 329 – 502 m with depth 250 – 402 m below, at the distance 1370 – 1552 m with depth 186 – 324 m below, and at the distance 2095 – 2257 m with depth 164 – 302 m below. Based on 2,5 D modelling mineral prospect area is located within the mineralized adesitic lava unit and silisification zone.

Kata Kunci : N