SEAMIC Newsletter Vol. 10
SEAMIC Newsletter Vol. 10
SEAMIC Newsletter Vol. 10
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production from the mine was 90,000 tons of ore at a grade of 25 g/t. The Buckreef mine which<br />
has gold resource of 614,000 oz at a grade of 4.08 g/t occurs in a mineralized shear system and<br />
has a steep dip to the east in both the north and south ends but in the centre the shear is<br />
vertical. The deposit contains 3.7 Mt ore, grading 3.26 g/t gold. The Rwamagaza mine consists<br />
of numerous auriferous quartz reefs found in a shear zone. Gold values range from 3.4 g/t to<br />
51.3 g/t. The most recent mine in the Lake Victoria Goldfield is Tulawaka Gold Deposit, a<br />
high grade mine with a resource of 1.7 M oz gold.<br />
Kahama greenstone belt: The Bulyanhulu mine is a world class deposit with a resource<br />
estimated at 14.6 Million oz grading 15 g/t. The stratigraphy of Bulyanhulu is characterized by<br />
Lower Nyanzian Supergroup volcano-sedimentary sequence largely comprised of bimodal<br />
mafic and felsic extrusive and intrusive rocks.<br />
♦ The Golden- Ridge deposit has a resource of 34 Mt of ore grading 1.46 g/t. It is underlain<br />
by folded and thrusted felsic volcanic and pyroclastic rocks and BIF.<br />
♦ Nyakafuru deposit has a resource of 730,000 oz at an average of 6.32 g/t. Dominant<br />
lithologies include mafic volcanic rocks and dolerite intrusions, mafic to intermediate<br />
tuffaceous, volcanoclastic units quartz feldspar porphyry and porphyry intrusions.<br />
♦ The Jubilee Gold reef mineralization occurs in shear zones of highly folded BIF in contact<br />
with rhyolite tuff, cut by chert intercalations. Within the shear zone gold – quartz veins are<br />
localized in sub-parallel faults. High gold values up to 46g/t have been reported and<br />
exploration is in progress.<br />
Major mining activities of Tanzania<br />
Buhungukira greenstone belt: There are several gold occurrences in this belt which include the<br />
Mwamazengo, Luhala and Kitongo. The Kitongo deposit contains a resource of over <strong>10</strong>.5 Mt<br />
of ore, grading at 1.42g/t<br />
Kilimapedha greenstone belt: The geological setting comprises Nyanzian greenstones<br />
composed of intermediate to mafic tuffs, mafic and felsic volcanics and BIF. Gold is in steep<br />
dipping lodes which contain quartz veins of low sulphide concentration in the form of pyrite<br />
and chalcopyrite.<br />
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