TROPICAL HEIGHTS AFRICA LIMITED

Tropical Heights is currently prospecting and putting in place mining operations in Mubende district in Uganda. The Mubende gold district is located approximately100 km west of Kampala in central Uganda .
The regional geology of the Mubende gold district encompasses rocks belonging to the Buganda metavolcano-sedimentary rocks in the Paleoproterozoic Rwenzori fold belt (2.1 to 1.85 Ga) and sedimentary sequences of the Paleoproterozoic post-Rwenzori platform sedimentary rocks, deposited on Neoarchean basement gneisses (Elepu 2011b).

Late orogenic Mubende-Singo granites also belonging to the Buganda Group intruded the metasedimentary rocks . The entire area has been crosscut by a 1.4 Ga (using U/Pb on zircon;Manttari 2009) arcuate dolerite dyke swarm.

 

Gold mineralisation in Mubende is high.The Mubende gold district  is littered by numerous alluvial gold workings. There are several localities at thecontact between the Singo granite and metasedimentary rocks where the granite is hydrothermally altered with weak to strong biotite–sericite–chlorite alteration. The timing relationship of this alteration to gold mineralisation is presently unknown.

 

The Tropical Heights  Africa Limited exploration area  is located in Kiduzi sub-county in the S of the Mubende gold district, about 1 km from the contact of the Singo granite batholith (Figure 11). This area  immediately borders the defunct Kamalenge gold mine which is now under Anglo Ugandan Corporation (AUC). According to Data et al. (2009), gold has been mined at Kamalenge since 1922. These authors have reported a 50 m long adit and several alluvium gold workings within rivers and valleys near the Kamalenge mine. Baguma (1991) estimated the total gold reserves in the Kamalenge mine to be 2.45 thousand tonnes. Since 1992, Anglo Ugandan Corporation (AUC) has been exploring for gold and base metals in the area.
The Tropical Heights Africa Limited exploration area is hosted in metasandstone interbedded with silicified metashale, metaconglomerate and metasiltstone, and controlled by a shear zone with a strike of N60Wand dip of 60SW. This shear zone contains quartz–hematitealbite veins; the wall rocks at the contact to these veins are silicified. There is a second, minor shear zone with a strike of N48E and a dip of 46NW. The direction of the main, 20 m long and 2 m wide, adit follows the trend of the main shear zone. The quartz–hematitealbite veins are characterised by subhedral to euhedral granular and hydrothermal specular hematite, with lamella twinning, filling the cracks and spaces within the quartzalbite grains. Rare albite grains are in equilibrium with quartz. Brownsubrounded grains of ilmenite locally overprint the granular hematite grains.
Hydrothermally altered and mineralised, fine- to medium-grained metashale and metasandstone arecharacterised by a yellowish grey, pink to reddish brown colour, with relict detrital quartz and plagioclase as well as abundant hydrothermal albite, sericite, hematite and traces of rutile and tourmaline. Late-stage muscovite (<0.3 mm) overprints the earlier fabric and the hydrothermal alteration minerals. The diamond-shaped euhedral hematite grains are disseminated within the wallrock and as anhedral grains (<0.1 mm) in fractures and voids. The hematite contains pleochroic inclusions of magnetitepyrite, indicating that the hematite has replaced magnetite and possibly sulfides (<0.3 mm).