Abstract.Mining industry is an industry with very high risk (losses). In order that mining activities can be run well, then the potential of the Earth's resources must be known for sure. one of the Earth's resources of high economic value is the iron ore. Iron ore is rarely found in a free state in nature, it is usually associated with other minerals and exposed randomly. With these properties, iron ore needs to be modeled before doing mining activities in order to avoid large losses. Iron ore deposits can be modeled with geoelectrical resistivity method. Dipole-dipole array will produce good imaging both vertically and laterally. From the measurement results of geoelectrical resistivity with dipole-dipole array will be obtained the value of measuring the current and potential difference. This value will generate into 2D and 3D model of the cross section of the iron ore deposits. One of the areas in West Sumatra has the potential for iron ore. Five lines were applied in this area. The result of cross section got the iron minerals associated with quartzite at 30 meters depth below the surface.
In general, groundwater processes are formed because water is absorbed from the surface into rock layers. The capacity of groundwater contained in a rock layer depends on the density, rock age, grain structure and grain size. Equitable distribution and distribution of ground water can be described vertically and horizontally according to the distribution of rock formations capable of storing and carrying water (permeable) or so-called aquifers. Geoelectric estimation basically uses the electrical properties of a rock formation on electric current that is injected in the direction of the earth through two current electrodes at two points on the surface of the earth and then reduces the potential differences that occur at two other points on the earth’s surface. For proper study this study is the Wenner-Schlumberger configuration. Basically, this geoelectric estimation aims to get a picture of the spread of rock layers that can store and carry water (aquifers).
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