SEAMIC Newsletter Vol. 10

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♦ ♦ ♦ Kigezi Goldfield: The source of the gold is considered to be the Karagwe-Ankolean System rocks or associated porphyritic granite and quartz veins as well as ironstone lenses hosted by these rocks. Mubende-Kiboga Goldfield: Gold occurs in thin quartz stringers in schists of the Singo Series at Kamalenge area and is also found in the saprolite zone of weathering just above unaltered bedrock. Karamoja Goldfield: Gold was first reported in gravels of River Kalere near Kaabong in 1960. Commercial gold exploitation was done in 1983 by artisans who worked alluvial, colluvial and elluvial material until primary sources were found. Lead: Galena has been worked out at Kitomi forest from hydrothermal quartz veins emplaced in the rocks of Igara schists and post-Igara epidiorite. Other prospects are Kitaka, Kampono and Kanyambogo. Zinc: Zinc occurs in association with lead at Kitaka Mine and Cu-Zn-Au-Ag mineralization at Bobong gossan in Karamoja. Nickel: Nickel occurs in association with cobalt at the pyrite/pyrhotite concentrate stock pile at Kasese. The proven reserve is 1.1 million tonnes at 0.4% Ni. Beryl: Beryl is found in acid pegmatites identical in composition with those worked for columbite-tantalite in the schistose aureoule surrounding post Karagwe-Ankolean granites. Beryl was found at Kazumu, Bulema and Ishasha. Beryl associated with cassiterite is also found at Nyinamaherere mine and Mwirasandu where large reserves of fine beryl are known to be in the tailings. Columbite-tantalite: Workable deposits of columbite-tantalite are confined within pegmatites and are genetically related to post-Karagwe-Ankolean arena granites of southwest Uganda. In 18
Mubende area, pegmatites have been found to contain the mineral. Major columbite-tantalite deposits in Uganda include Kakanena, Jemubi, Nyanga and Ngoma-Kazumo with up to 83% Ta 2 O 5 and 70% Nb 2 O 5 . The most important niobium mineral is pyrochlore which occurs in carbonatites at Sukulu (130 million tones at 0.2% Nb 2 O 5 ) and Butiru in east and at Napak and Toror in Karamoja. Bismuth: Bismuthite and native bismuth occur in highly oxidized veins and bodies emplaced in rocks of the Karagwe-Ankolean System close to the Kayonza granite intrusive. The most prospective location is Rwanzu, and others are Muramba, Kyambeya, Rwenkuba, Kitawulira, Kitwa and Nyakashunzu. Manganese: Manganese-ore occurrences have been found in Isandara, Gulika, Kirongo and Gweitengya in western region. Radioactive minerals and REE: Potential favourable geological environment for radioactive mineral enrichment are the eastern Uganda carbonatite complexes, the Uganda volcanic fields, the granitised domes of eastern and western Uganda, the fault zones and the adjacent highlands of western and northern Uganda. Industrial Minerals (Non-Metallic Minerals) Carbonate rocks: Carbonatite centres include: Bukiribo (16.5 million tonnes), Sukulu (Magnesia >3.5% and P 2 O 5 ~3.7%), Napak, Toror and Lolekek. Limestone include: Hima limestone (about 18 million tonnes) and Muhokya and Dura limestone deposits. Phosphates: Phosphates occur in the Eastern Carbonatite complexes and in the overlying residual soils as apatite at Sukulu (230 million tonnes at 12.8% P 2 O 5 ) and Busumbu. Over 160,000 tonnes of apatite concentrate for Single Super Phosphate (SSP) fertilizer were extracted from residual soils. Reserves of 3 million tonnes at 11% P 2 O 5 and 5.5 million tonnes at 15% P 2 O 5 with acceptable levels of silica, Mg, Cd and Pb were estimated at Busumbu. Feldspars: Feldspars occur in pegmatites of which small amounts have so far been mined at Bulema and Nyabakweri Mines and Lunya for ceramics production. Also a number of pegmatites with a high possibility of recoverable quantities of feldspar for example at Mutaka occur in South-Western Uganda. Kaolin: Kisai/Kooki, and Namasera kaolin is known to have been formed by alteration of sedimentary shales and about 2.5 million tonnes and 64,000 tonnes of good material for ceramics has been estimated respectively. At Mutaka the kaolin deposit is associated with pegmatites. Other kaolin occurrences which are kaolinised granitoids are located at Buwambo and Migade. Salts: Best known reserves are located in the lake brines of Lake Katwe (2.5 km 2 and 0.75 m depth) located on the Northern shore of Lake Edward in the Western Rift Valley. The lake constitutes of about 22.3 tonnes of mixed salts (i.e. NaCl - 8%, NaSO 4 - 9%, KSO 4 - 3%, KCl - 2% and KBr - 2%). Gypsum: Gypsum occurs in the Quaternary sediments at Kibuku (12 million tones of gypsiferrous clay worth 1.2 million tonnes of gypsum concentrate at 85% gypsum), Lake Mburo (1.1M tones of gypsiferrous clay worth 290,000 tonnes of gypsum concentrate at 60- 70% gypsum) and Muhokya (3.2 million tonnes of gypsiferrous clay capable of producing 40,000 tonnes of gypsum concentrate at 86-90% gypsum). Silica Sand: Beaches of white sand formed from erosion of quartzites in the basement and cover sequences occur in several places along the shores of Lake Victoria. Grain size analysis data 19
Page 1 and 2: SEAMIC SOUTHERN AND EASTERN AFRICAN
Page 3 and 4: INVESTING IN ANGOLA'S MINERAL WEALT
Page 5 and 6: About 90% of the Gold produced in A
Page 7 and 8: Diamond Mining Kimberlite Pit Ornam
Page 9 and 10: MINERAL RESOURCES OF TANZANIA BY GE
Page 11 and 12: Despite having such a geological en
Page 13 and 14: Musoma-Mara greenstone belt: The Bu
Page 15 and 16: Building and dimension minerals Gra
Page 18 and 19: ♦ ♦ ♦ Karagwe-Ankolean System
Page 22 and 23: eveals that in untreated form this
Page 24 and 25: News KENYA - THE NEW SEAMIC MEMBER
Page 26 and 27: Mineral Processing A training cours
Page 28 and 29: Chemical and Environmental Two trai
Page 30 and 31: COMING EVENTS MEETINGS Governing Co
Page 32: SEAMIC southern and eastern african

SEAMIC Newsletter Vol. 10

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