The new Askaf mine with its estimated 3 billion ton of iron ore near Zouerate in northern Mauritania needs a guaranteed water supply of 11 million litres/day. The Touadeni Basin to the east has the potential to deliver this if the geology of the basin can be properly understood. Aeromagnetic data allowed the identification of faults and thrusts on the adjacent Reguibat Shield and tracing them into the Touadeni Basin. Two eastwards dipping conductive horizons in the Basin could be identified on TEMPEST CDI’s and existing borehole information allowed them to be correlated with dolomite layers. The contact between the dolomite and underlying sandstone-shale layers has frequent water strikes and were selected as targets especially where evidence existed of faulting. Tau maps played a major role in choosing the targets.


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