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Time-domain electromagnetic tests in the Wadi Bidah District, Kingdom of Saudi Arabia

January 1, 1994

A time-domain electromagnetic (TDEM) method was tested in two areas of mineralization in Precambrian rocks in the Wadi Bidah district, Kingdom of Saudi Arabia. Transient-decay voltages in profile mode were measured across the Sha'ab at
Tare and Rabathan prospects by use of three transmitterreceiver loop configurations. At the Sha'ab at Tare prospect all of the loop configurations indicated the mineralized
zone. Analysis of the coincident loop data at Sha'ab at Tare reveals that gossanous and altered rock of i0 ohm-m resistivity extends to a depth of 35 m, where there is an unweathered, dry mineralized zone of about 1 ohm-m resistivity. The model further suggests that the rocks at a depth of 55 m and below the water table are even less resistive (0. 1 ohm-m). The TDEM method successfully discriminated conductors within from those below the weathered zone at the Rabathan prospect. Conductors below the weathered zone are identified by a lack of transient response in the early part of the transient decay curve, followed by an increasing response in the middle to late parts of the transient decay curve. Results of these limited tests suggest the potential value of integrating TDEM with other geophysical tools in the Kingdom. Recommendations are made to expand these tests into a more comprehensive program that will evaluate the TDEM potential in various geologic environments that are host to mineral deposits of diverse origin.

Citation Information

Publication Year 1983
Title Time-domain electromagnetic tests in the Wadi Bidah District, Kingdom of Saudi Arabia
DOI 10.3133/ofr83613
Authors Vincent J. Flanigan, Hamdy Sadek, Bruce Smith, C. L. Tippens
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 83-613
Index ID ofr83613
Record Source USGS Publications Warehouse