Dutwa lies in the Kilimafedha belt (Swahili for "money hills") of the Lake Victoria Goldfield. Greenstones and granites underlie the area. The greenstones, of Archaean Nyanzian age, are mostly metamorphosed volcanic and sedimentary rocks, with some banded iron formation in the east. Several large ultramafic bodies intrude the greenstones, the nickel laterites form a blanket up to 80m thick on top of these.
To investigate the main nickel anomaly, African Eagle undertook trial drilling in June 2008. The results were very encouraging and a 139 hole reverse circulation (RC) drilling programme was completed to delineate the resource. The Company also undertook a 10 hole diamond drill programme to obtain core samples for metallurgical testing and density measurements. From the results of this drilling independent consultants SRK Consulting (UK) Ltd estimated a maiden JORC inferred mineral resource in November 2008.
The Dutwa nickel oxide project consists of two hilltop deposits, Wamangola and Ngasamo, which form thick residual lateritic caps on the tops of low ridges 7km apart.
Combined the two deposits have a JORC Indicated and Inferred resource of around 100Mt at circa 1% nickel. 94% is in the Indicated category with the ferruginous siliceous ore ("FeSi") comprising 70% of the total resource. As announced on 12 September 2012, the Wamangola FeSi ore is strongly amenable to beneficiation and demonstrates improved leach characteristics compared to run-of-mine ore.
Table 1: JORC Mineral Resource statement, as at September 2012
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