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Bahi North

The Bahi North Project is located in central Tanzania, approximately 460 kilometres northwest of Dar es Salaam and some 50 kilometres northwest of the capital Dodoma. It covers an area of approximately 1,640 square kilometres.

The Project area is located within the Bahi intra-cratonic basin, an extensive closed internal drainage system that feeds into the Bahi Swamp, a large playa lake. Uranium leached from deeply weathered Archaean granites within the Bahi catchment area has been transported in solution then deposited in chemical traps within the palaeodrainage channels and ultimately in the playa lake sediments.

Uranium accumulation within the Bahi catchment system has been recognised since 1953 when an intersection of 0.15 metres @ 2,400ppm (0.24%) U3O8 was recorded in a salt exploration program drill hole near the centre of the Bahi Swamp. Previous explorers identified a number of radiometric anomalies in the Bahi catchment area from an interpretation of airborne geophysical data and followed-up select anomalies with ground surveys and trenching during the late 1970's (Figure 1).

Bahi North Project – Geological Setting and Anomaly Locations
Figure 1: Bahi North Project - Geological Setting and Anomaly Locations

Within the Bahi North Project area, the Kisalalo anomalies were followed-up with ground surveys and limited trenching (Figure 1). In one location, the secondary uranium mineral carnotite was identified in strongly silificied calcrete. Analyses of three grab samples of the calcrete returned between 130ppm and 471ppm U3O8. Secondary uranium mineralisation was also observed in one of two trenches sunk to investigate an anomaly further to the north-east. The best result obtained from the trench samples was 187ppm U3O8 over 0.3 metres. None of the Kisalalo anomalies were drill tested. The Makanda anomalies to the north-west were not followed-up by ground work.

Mantra's exploration targets at the Bahi North Project are calcrete-hosted uranium mineralisation in the surficial environment and sandstone-hosted deposits within buried fluvial channel systems. The exploration work program comprises an initial phase of geological mapping, ground radiometrics and trenching covering both the Kisalalo and Makanda anomalies, as a prelude to target definition and shallow drilling. Geophysical (electromagnetic) methods will be used to map buried palaeochannels and define suitable trap sites. Areas of defined prospectivity within the palaeochannels will then be systematically tested by drilling.

For further information, please see the latest Company Report.


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