Integrated Geophysical Studies for Mineral Exploration at Wadi El-Homer, Wadi Ranga Area, South Eastern Desert, Egypt.

Document Type : Original Article

Authors

1 Geology department,facality of science,Al-Azhar university ,Cairo.Egypt

2 Geology department, facality of science,Tanta university

3 Geology department facality of science Tanta university

4 Geology department,facality of science,Cairo university ,Cairo.Egypt

Abstract

The occurrences of mineral ore deposits and disseminated sulfides in area are geologically thought to be associated with parts of the shearing fault and the alteration shear zone, which is composed of porphyritic rhyolites - dacite and metamorphosed volcanics highly fractured rocks occupying the all parts of the area. Mineralogical analyses that were done on bedrock samples of the oxidized and alteration zones indicated that there are several anomalous spots of minerals reached up to 2.1ppm for Au. Therefore, the magnetic, resistivity and induced polarization surveys were applied critically interpreted at area to delineate the mineral ore deposits in terms of depths and extensions. The interpretation of magnetic data was carried out by using the Horizontal gradient, source edge detection and source parameter image techniques. The results indicated that the depths of such highly magnetized ore deposits are ranging from near surface up to 30 m deep. The quantitative interpretation technique of Gradient resistivity -IP determined depth to the top of the ore body ranged from 17.9 to 70.7 m and maximum width ranges from 67 to 181 m. The positive anomalies on the IP map are clearly coinciding with the sites of alterations, shears and contact zones. One 2D resistivity/IP imaging profile that were measured along the site of anomalies selected from maps in area and were inverted using the RES2DINV program. The results of 2D-resistivity and IP inversions indicated that there are anomalous zones of high conductivity and chargeability; indicating probable locations of ore deposits and/or disseminated minerals.

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