Ushirombo Gold Corridor
The Ushirombo Project covers a total area of approximately 235 square kilometres and is situated in the Lake Victoria Goldfields of Tanzania. The producing gold mines and other deposits of the Lake Victoria Goldfields are hosted within a series of Archaean greenstone belts, similar in age, lithologies and mineralization to the Abitibi Belt of northern Ontario and Quebec. Recent work, including exploration drilling, has shown that some of the greenstone belts in Tanzania are more extensive than was previously realised, especially the Ushirombo Belt in the area of Tanzanian Royalty’s holdings which lie 30km southeast of the Tulawaka gold mine of Barrick/MDN.
Previous Work Programs
Previous work at Ushirombo by Barrick Exploration Africa Ltd. (BEAL) included exploration identified significant geochemical targets as well as areas of historic and current artisanal gold mining in attractive geology and structures within the Ushirombo Project. The work did not fully test the property which remains an excellent target area for gold deposits. The field work subsequently carried out by Tanzanian Royalty focused on diamond exploration in 2003-2006. In January 2009, the Company prepared a new geological interpretation of the Ushirombo property, integrating prior airborne magnetic/radiometric data plus the BEAL mapping and RAB drilling results. This interpretation identified the “Ushirombo Gold Corridor” (UGC) a 12km long by 6km wide northwest-trending zone, essentially in the greenstones, as the prime target area.
The UGC contains the areas of historic and current artisanal gold mining and is traversed by the principal regional structures that appear to be associated with the gold mineralization. The gold mineralization found within the belt generally occurs in structurally-controlled narrow quartz veins. The most significant gold deposit found to date in the belt is Resolute’s Nyakafura property. At Nyakafura the gold mineralization is associated with several north-trending vein systems within steeply-dipping shear zones. The vein systems are typically a series of silicified and carbonatized zones with extensive quartz veining plus variable pyrite, some arsenopyrite, and minor copper sulphides and galena. The gold largely occurs as fine particles in pyrite, and there appears to be a good correlation between pyrite content and the grade of the gold mineralization.
Beginning in April 2007 the Company commenced gold exploration on the Ushirombo Project including IP surveys. A thorough review of all geochemical data accumulated by Beal was completed and further soil sampling was done by the Company over prospective targets. In January 2009 a new geological map was prepared from the integration of BEAL’s RAB drilling, prospecting and airborne magnetic/radiometric data. Based on the geological interpretation and the location of artisanal workings and gold-in-soil anomalies, Tanzanian Royalty determined that the gold occurrences are spatially concentrated within a 12km long by 6km wide northwest-trending zone that was named the “Ushirombo Gold Corridor.” The southern edge of the corridor essentially follows the regional shear/lithological contact between the Ushirombo Greenstone Belt and the granites to the south. The northern part of the UGC straddles lithological contacts within the greenstone belt.
Two discrete airborne magnetic trends were identified, one along the northern granite/greenstone contact with a 1.4 km gold-in-soil anomaly from previous RAB drilling and the other within the granites just south of the greenstone belt. Infill soil sampling over these targets showed continuity of elevated gold values between lines 200 m apart. None of the principal geological/structural/geophysical with gold-in-soil anomalies has been tested with bedrock drilling programs.