KITONGO GOLD PROJECT GEOLOGY

---

The Kitongo Project is located in a highly prospective section of the Sukumaland Greenstone belts. Old gold workings in the form of pits and shallow shafts and trenches occur in a number of areas. The project area is underlain by Archaean granitoid-greenstone lithologies of the Kitongo-Ugambilo Granitoid-Greenstone Sub-Terrane of the Mabale Terrane located in the Lake Victoria Goldfields.

Major lithological units are mafic volcanic, volcanic pyroclastic rocks and flows, felsic and mafic intrusive rocks, units of the Lower Nyanzian formation, banded Iron formation (BIF) of the Upper Nyanzian formation, un-conformably overlain by Kavirondian sediments. These units are intruded by syn- to post Nyanzian granitoids. The overall stratigraphy is thought to form an anticlinal structure that plunges to the southeast. In low lying areas the topography is mostly covered by laterite and mbuga clays (black cotton soils).

Basalts are located at the base of the greenstone sequence in both the northwest and southeast regions. Immediately overlying the basalts in the northwest region is a sequence of volcaniclastic siltstones and fine sandstones of unknown thickness. Overlying this is a line of prominent hills consisting of chert breccia and chert conglomerate. Stratigraphically above this unit a very wide sequence of sediments dominated in outcrop by banded iron formations (BIF's) and to a lesser extent banded cherts.

The Main Zone mineralisation is located at the juncture of NW-SE trending regional structure, NE trending regional structure and the SE plunging anticlinal fold. Mineralisation is hosted in brecciated cherts, banded-iron formations (BIFs) and tuffs within quartz veins and stockworks. Gold is associated with disseminated arsenopyrite and pyrite in fresh rock and gossanous/limonitic host rocks in oxide. Weathering of the deposit has occurred to a depth of 40-50m and has resulted in supergene enrichment of the gold mineralisation in the oxide portion of the deposit.

back to top