Hasil Pencarian  ::  Simpan CSV :: Kembali

Abstrak :
Komoditas emas yang tinggi serta lapangan poduksi Pongkor yang sudah beroperasi sejak puluhan tahun lalu membuat perlu ditemukannya zona potensi baru untuk produksi pertambangan emas. Untuk mengetahui zona mineralisasi emas dan kemenerusannya, maka dilakukan studi geofisika dengan menggunakan metode Time Domain Induced Polarization (TDIP) dan magnetik. Data TDIP yang terdiri dari data resistivitas dan chargeabilitas diinterpretasi untuk menentukan zona alterasi dan mineralisasi bawah permukaan yang dikorelasi dengan data magnetik yang telah di inversi 3D sehingga mendapatkan parameter suseptibilitas. Berdasarkan nilai resistivitas di daerah penelitian, zona alterasi argilik diduga memiliki nilai <50 Ohm.m dan zona alterasi silisifikasi diduga memiliki nilai >50 Ohm.m. Nilai chargeabilitas zona mineralisasi diindikasikan memiliki nilai 100-810 m.sec. Zona mineralisasi di daerah penelitian memiliki nilai suseptibilitas berkisar antara -0.073 hingga -0.021 cgs. Dari ketiga parameter tersebut, diduga zona mineralisasi terdapat di bagian Timur daerah penelitian dan berorientasi Utara-Selatan searah dengan orientasi sesar utama.

---

The high gold commodity as well as the Pongkor production field that has existed since last year made it necessary to find a new potential zone for gold mining production. To find out the zone of gold mineralization and its continuity, then conducted geophysical studies by using the methods of Time-Domain Induced Polarization (TDIP) and magnetic. TDIP data consisting of resistivity and chargeability data are interpreted to determine alteration zones and subsurface mineralization that are correlated with magnetic data that has been inversed in 3D to obtain susceptibility parameters. Based on the value of resistivity in the area of research, the argilic alteration zones are thought to has a value of < 50 Ohm. Silisification alteration zones supposedly has the value > 50 Ohm. m. The value of the chargeability zone of mineralized indicated has a value of 100-810 m sec. Research in the area of mineralized zone have a value in the range suseptibilitas -0073 to -0.021 cgs. From those parameter of the mineralized zone, it is assumed that the mineralization zone is in the eastern part of the study area and oriented North-South direction with the orientation of the main fault.

Abstrak :
Proses magmatisme berkaitan dengan jalur tektonik ring of fire, yang menyebabkan proses mineralisasi hidrotermal sehingga membentuk potensi sumber daya mineral di Indonesia. Salah satu endapan hidrotermal yaitu endapan epitermal sulfidasi rendah yang berada di Lapangan “RD”, Cibaliung. Struktur patahan menjadi pengontrol sistem epithermal sulfidasi rendah sebagai tempat terendapkannya mineral emas. Integrasi data geologi dengan geofisika diperlukan dalam menentukan struktur pengontrol dan zona potensi mineralisasi. Mineral bijih sulfida dapat dibedakan dari sifat kemagnetan dan kelistrikan dikarenakan mineral logam memiliki respon suseptibilitas, resistivitas dan chargeabilitas lebih tinggi dibandingkan dengan mineral non-logam. Zona potensi mineralisasi emas sulfidasi rendah berada pada zona struktur yang didominasi alterasi argilik dan kaya akan mineral sulfida pada alterasi argilik ilitik dengan nilai suseptibilitas menengah hingga tinggi kisaran -83.7 nT – 92.3 nT, resistivitas dengan nilai rendah hingga menengah 0 – 25 ohm.m dan chargeabilitas dengan nilai menengah hingga tinggi 15 - >75 msec. Dari ketiga parameter tersebut, diduga zona mineralisasi berada pada zona struktur patahan berorientasi Baratlaut-Tenggara. Struktur pengontrol zona potensi mineralisasi tersebut berada di lintasan 3 yaitu patahan D dip 62° ke arah NE dan patahan E dip 83° ke arah NE. Lintasan 4 yaitu patahan D dip 79° ke arah NE, patahan E dip 77° ke arah NE dan patahan F dip 73° ke arah NE. Lintasan 7 yaitu patahan D dip 80° ke arah SW dan patahan E dip 75° ke arah NE. Lintasan 8 yaitu patahan D dip 84° ke arah NE dan patahan E dip 66° ke arah NE. Lintasan 9 yaitu patahan A dip 70° ke arah SW dan patahan B dip 81° ke arah NE. ......The magmatism process is related to the Ring of Fire tectonic pathway, which causes a hydrothermal mineralization process to form potential mineral resources in Indonesia. One of the hydrothermal deposits is an epithermal low-sulfidation deposit in the "RD" Field, Cibaliung. The fault structure controls the epithermal low-sulfidation system as a place for gold mineral deposition. Integration of geological data with geophysical data is required in determining the controlling structure and potential mineralization zone. Sulfide ore minerals can be distinguished from their magnetic and electrical properties because metal minerals have a higher susceptibility, resistivity and chargeability response compared to non-metallic minerals. The potential zone of low sulfidation gold mineralization is located in the structure zone which is dominated by argillic alteration and rich in sulphide minerals in Illitic argillic alteration has medium to high susceptibility values ranging from -83.7 nT - 92.3 nT, resistivity with low to medium values 0 - 25 ohm.m and chargeability with medium to high values of 15 -> 75 msec. From those three parameters, it is assumed that the mineralization zone is located in the NW-SE oriented fault structure zone. The controlling structure for the zone of mineralization potential is in line 3 is fault D with dip 62° to the NE and the E fault with dip 83° to the NE. Line 4 is fault D with dip 79° to the NE, fault E with dip 77° to the NE and fault F with dip 73° to the NE. Line 7, is fault D with dip 80 ° to the SW and the E fault dip 75° to the NE. Line 8 is fault D with dip 84° to the NE and fault E with dip 66 ° to the NE. Line 9 is fault A with dip 70° SW and fault B with dip 81° to NE.