IDENTIFIKASI PERSEBARAN BATU GRANIT MENGGUNAKAN METODE GEOMAGNETIK PADA PT VITRAMA PROPERTI DI DESA AIR MESU KECAMATAN PANGKALAN BARU KABUPATEN BANGKA TENGAH

Abstract

Exploration is any activity prior to the specific mining activities to know, estimate, and obtain the size, shape, position, average rate and amount of reserve of a mineral deposit in order to determine the quality and quantity of a precipitate in order to know its economic value. Based on found outcrop, PT VITRAMA PROPERTI located in Desa Mesu Pangkalan Baru Sub-district of Central Bangka Regency has potential of granite stone resource, potential resource zone and distribution direction need exploration activity, one of them using geomagnetic method. Utilizing 2 units of magnetometer device with base magnetometer application and mobile magnetometer to perform magnetic (suseptibility) readings of rocks and minerals below the surface. The number of trajectory tracks is 11 trajectories, spaced 10 m reading point with total number of point of readings 631 dots, maximum track length 1.08 km, spaced each 100 m trajectory, minimum elevation 40 m and maximum elevation 170 m. Based on the data of reading of geomagnetic method in Bukit Nunggal area, IGRF 42,870.88 got the inclination point -12.5308 declination 0.5616. Furthermore, the highest susceptibility value is 7.8 nT and the lowest is -11.1 nT. While the identified granite stone has a value of susceptibility between 2.5-7.8 nT. The contour map of the resulting magnetic anomaly shows the potential zone and the direction of the distribution of the granite stone resources towards the west.