approaches zero as the structure approaches a horizontal sheet. The price paid for this increased flexibility is a heavier burden on the interpreter. Most of these anomalies occupy the shear, silicified zones, alterations zones and rock contacts. Models and Exploration Methods for Major Gold Deposit Types Robert, F. [1] , ... For gold exploration, important geophysical advances include airborne gravity, routine 3D inversions of potential field data, and 3D modeling of electrical data. The technique is based upon Euler's homogeneity relationship (hence, the acronym EULDPH) and differs from similar techniques which are currently available in that no basic geologic model is assumed. SP data were collected along 7 profiles at 10 m station interval with approximate profile separation of 100 m. The anomalies of possible ore bodies were found at depth of about 18–25 m using Euler deconvolution of SP data. Most of these anomalies occupy the shear, silicified zones, alterations and rock contacts. Three dipole-dipole geo-electrical traverses were carried out along the anomalous sites, the traverse locations selected from the constructed magnetic maps of the study area, and the resistivity and IP measurements along with them. method was developed by Eberhart and Kennedy (. Different geophysical tools such as magnetic, geoelectric, gravity and radiometry have been carried out on basement rocks in Eastern Desert and Sinai to delineate the subsurface structures, alteration zones, ore bodies, geothermal activity and groundwater at fractural basement and surrounding Wadis (Araffa et al. samples of the oxidized and alteration zones indicated that there are several anomalous spots of minerals reached up to 3.6, 62.9, 87 and 202 ppm associated with Au, Ag, Pb and Zn respectively. A wide range of geophysical surveying methods exists, for each of which there is an ‘operative’physical property to which the method is sensitive.The methods are listed in Table 1.1. Read Online Geological Methods In Mineral Exploration And Mining used to devise geophysical methods that are essential in the search for minerals, oil and gas and other geological and environmental problems. • Mapping of subsurface gold prospects/ mineralisation The Gradient resistivity map showed low resistivity values, less than 90 Ohm.m, with variable width. Geophysical exploration for gold and associated minerals, case study: Wadi El Beida area, South Eastern Desert, Egypt September 2009 Journal of Geophysics and Engineering 6(4):345 data was carried out by using two techniques; the first is 3D magnetic inv, deconvolution and the second is magnetic models using the MA, of the magnetic interpretation indicated that the depths of such ore deposits range from 35.9 to. Dipole--dipole induced-polarization measurements are commonly presented as pseudosections, but results using different dipole lengths cannot be combined into a single pseudosection. dipole–dipole sections were carried out along the anomalous sites selected from the, constructed maps in the study area and were inverted using the RES2DINV program. The electrical data is inverted in 2D along several profiles across the main favorable zones of Cu-bearing mineralization to image the electrical resistivity and chargeability properties. zones. All figure content in this area was uploaded by Sultan A Araffa, The occurrences of gold and disseminated sulfides lie as a part of the shearing fault zone. High chargeability anomalies appearing directly close to the CO2-rich groundwater springs were inferred to metallic oxides and hydroxides precipitation in the upper part of the aquifer, linked to pressure decrease and changing redox conditions in the up-flowing groundwater approaching the land surface. The other instrument was used for field measurements along, nine profiles through the surveyed area (figure. Titanomagnetite is a mineral composed of oxides of titanium and iron. The world-wide interest in gold that has characterized mineral exploration in the 1980s has had a profound effect on the focus and style of geophysical prospecting. Bands 1, 4, 6 and 8 were designated for identification clay minerals. According to the eigenvector statistics calculated using SPCA for ASTER, inverse SPC4 image identified clay minerals and SPC2 images detected argillic alteration, oxides/hydroxide minerals, phyllic alteration and propylitic . Quantitative interpretation was done on the selected anomalies along the coded lines on the normal SP contour map. alteration mapping. National Research Institute of Astronomy and Geophysics, 11722, Helwan, Cairo, Egypt, Egyptian General Mineral Resource Authority (EMRA), Abbassia, Cairo, Egypt, Center of Geophysics, University of Lisbon, Campo Grande Ed. Magnetic technique is the most commonly used geophysical tool in gold exploration, as it is in exploration for other metals (Doyle, 1990). Photogeology is a very important of gold deposit exploration. techniques indicate that the study area no. (a) Map showing profiles AA/, BB/, CC/ and DD/across the Babaikundi-Birgaon Axis (BBA). volcanics are occurring as variably strained meta-andesites and. Consequently, they exhibit a wide range of geophysical signatures. On sea and land ( Reynolds, 1997 ) in areas of high altitude photography satellite! 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