Mavuzi Gold & Uranium Project

The historical Mavuzi uranium mine and a second old production centre, the Castro mine, constitute the Mavuzi Prospect, where the initial discovery of uranium in 1948 resulted in the reported production of 50 tonnes of U3O8 between 1948 and 1950 with uranium mining continuing until 1974.

The style of the recognised Mavuzi uranium prospects are shear-hosted, late stage, potassic, carbonate silica replacement and disseminated uranium-iron oxide mineralisation.  The deposits form in crosscutting relationships to a variety of host lithologies, including anorthosites, gabbros, calc-silicate rocks and gneisses.

Drilling conducted by Omega at three of the five Mavuzi prospects indicates vein style davidite-carbonatecalc- silicate-albite alteration along the seven km long Mavuzi to Castro trend.  Further potential remains along the northern extent of this trend, particularly in the vicinity of the Castro and Inhatobui prospects.

Gold mineralisation at the Boa Viseau Project was identified through gold anomalies in soil and is broadly associated with east northeast trending meta-carbonates and occurs as relatively narrow, hydrothermal quartz veins.  Gold mineralisation was found to be associated with the footwall of a silicified zone associated with narrow milky quartz veins in carbonatite host rock.  The gold mineralisation appears related to moderately silicified coarsely grained ferroan dolomite and a fine disseminated pyrite alteration zone.

North River intends to focus on the Castro and Inhatobui prospects as well as the Boa Viseau gold prospect.  Initially work will be limited to data review followed by infill mapping and soils as required.  Should results justify a drilling programme North River intends to seek to farm out its interest in the Mavuzi.