Uganda Ready for Investment New Exploration Targets (2) Department of Geological Survey and Mines

Gold in Buhweju area, SW

Stream sediment geochemistry, carried out by UNDP (Pekkala 1995) was partly reanalyzed by SMMRP. Soil geochemistry was tested on one target. The new geochemical results confirm the gold potential of the Buhweju area. A new target Kitaka Au area to the south of the Mashonga gold occurrence (Fig. 1) was located. In addition to gold also a Buckley’s Reef Au limited area with anomalous REE grades in the stream sediments was found. Anderson’s Reef Au Legend of the map. Geology is by the SMMRP mapping. Grid of soil geochemistry at Buhweju target (gray box in Fig. 1). Gold anomalies produced by the UNDP survey were confirmed and further work is necessary. Gold anomalous Chonyo River Au Muti River Au samples are mainly concentrated in SE of the sampling area.

Fig. 1. Buhweju area gold occurrences. The yellow dots are known gold occurrences. Mashonga Au The stream sediment sampling done in 1995 (UNDP) returning high gold values are shown by grey dots. The reanalyses of 280 of those samples gave distinct gold indications REE in the area to the south of the Mashonga gold field, where no gold occurrences are currently known. Gold potential quartz vein systems are indicated by orange lines. The re-analyses of the UNDP samples also indicate a strong Gold grains from galena-quartz veins hosted in mafic rocks, REE anomaly to the SE of Mashonga. The grey Kitaka deposit (see Fig. 1 for location). box indicates an area for soil geochemistry (Buhweju soil).

West gold potential Gold potential Busia area, SE Uganda Tanzania through western Kenya. These rocks host gold mineralizations in connection to banded The stream sediment survey by SMMRP indicates clearly that the Nebbi area in NW Uganda, with The Archaean Greenstone Belt in south-east iron formation (BIF) and with quartz veins in Archaean greenstone belts (Fig. 2), corresponding to the Kilo-Moto environment in DRC, has gold Uganda is composed of volcano-sedimentary rock shear zones. Gold is currently being exploited at potential (Fig. 3). sequences known to extend from neighbouring Tira Mine in Busia District. A larger area has gold potential.

300 000 Amonikakine gold workings

Tira Mine

Zombo

Zeu

Zombo Zeu

20 km

270 000 Fig. 2. Draft final geological map (SMMRP original at scale Fig. 3. Gold anomalous stream sediment samples plotted 1:250 000) of the southern West Nile area with Archaean on an airborne magnetic map. A distinct concentration of greenstone belts (A3CWabl). These are expected to be gold anomaly points can be seen to the north of the village of Zeu. Gold potential zones in the Archaean of SE Uganda. Original Amonikakine artisanal gold workings in Busia area. potential due to similarity with the Kilo-Moto area in the DRC. Soil sampling results are available within areas marked by red map SMMRP NA-36-15 Jinja at scale 1:250 000. Grid 20 km. boxes (Warr and Nebbi).

Magnetic anomalies in Falls are outcropping on the magnetic anomaly (Fig. 6). On the other hand, mafic intrusions (narrow area, sills) with Ni, Cu, Cr and PGE potential cannot be excluded. Especially the fold structures can be Stream sediment sampling carried out during expected to host concentrations of mobile metal 1972-1975 by Rizk (1977) covering map sheet sulphides The about 10 km long Kasongoire 31 at Karuma Falls, indicated anomalous nickel anomaly hosts potential for sulphide occurrences Fe grades. When comparing the results to new and iron ore. Fe airborne magnetic maps (Fig. 4) it was noted that Fe the nickel anomalies group around a magnetic Fe anomaly at Kasongoire. A new stream sediment River Nile sampling was carried out by SMMRP in order to confirm the prospectivity of this area (Fig. 5). Kasongoire Ironstones Kasongoire Fig. 6. Locations of SMMRP gravity, magnetic and radiometric The Kasongoire airborne magnetic anomaly was Kasongoire survey traverses (white tracks). Black dots with Fe indicate location of ironstone outcrops and the white dots outcrops of checked on the ground using gravity to see if there chert. The high Ni grades in soil are indicated by greenish grey is excess mass at the site. The survey confirms that dots. The maximum values are concentrated on two magnetic Fig. 5. Ni contents of stream sediment samples taken by zones. heavier rock coincides with the magnetic anomaly. Fig. 4. Magnetic analytic signal in Masindi, Karuma Falls area. SMMRP are anomalous in connection to magnetic anomalies. The reason for the geophysical anomalies could be Light blue on the map are the Lake Kyoga (right) and the River Nile. Geochemical survey in the area lined by the box. the magnetite-hematite bearing ironstones that

Marble at Moroto Karamoja area

In the Karasuk series marble is common in several areas in and around Moroto in eastern Uganda (Fig. 7). The most important use of these resources would be for cement, but also use for dimension stone should be considered, due to quite attractive banding and folding in the marble (Fig. 8). Currently only small scale mining is on going (Fig. 9).

If an industrial scale quarrying operation of these marbles is considered, it is a fundamental condition that the deposit is reliably known and confirmed that cement quality calcitic marble does occur as extensive and thick enough layers/ bodies that can be quarried economically.

Fig. 7. Example on marble potential areas (bluish green in Nakiloro, there are ultramafic volcanics, now serpentinites Fig. 8. Katikekile marble in outcrop. Fig. 9. Marble quarried at Katikekile, Moroto district. border) on draft geological map. Original map Draft NA-36- and talc schist that locally contain pods and veins of chromite 8 Moroto at scale 1:250 000 (SMMRP). To the NE of Moroto with PGE potential. Further woks are recommended.

CONTACT ADDRESS: The Commissioner Department of Geological Survey and Mines Ministry of Energy and Mineral Development Plot 21 - 29, Johnstone Road Website: www.energyandminerals.go.ug P.O. Box 9, Entebbe, Uganda Tel.: +256-414-320656 Fax.: +256-414-320364 E-mail: [email protected], [email protected] Website: www.uganda-mining.go.ug