3D Modelling of Iron Sand Using Geoelectrical Resistivity Method with Wenner Array in Ulakan Tapakis, Padang Pariaman, West Sumatra

A studies using the resistivity method have been carried out to determine the potential
of iron sand in Ulakan Tapakis West Sumatra. This study aims to establish the potential 3D
modelling of iron sand. Wenner array is used to determine location of anomalies by taking 5
sections which has 180 meter length. The distance of the electrode used is 3.9 meters. Generally,
Ulakan Tapakis has 3 main components of alluvial deposits, namely a layer of top sand (upper
sand), middle sand, and a layer of iron sand which is divided into 2 layers, namely the bottom
sand and the iron sand layer which has a resistivity value ranging from 9.53 -14135 Ωm. These
layers have different resistivity values depending on the constituent material. The existance of
iron sand is located at depths of 0-6 meter below sea surface, with range of resistivity is 9.531000
Ωm.