![]() | ![]() |
![]() | Tulawaka Property Projects | Included Licenses | Summary & Overview | Tanzanian Royalty Exploration Interest | Geology | Geochemistry | Drilling Results | Future Plans Tulawaka Property![]() Summary & Overview
Regional Geology : The Tulawaka Project Area is located in the western sector of the Rwamagaza Greenstone Belt. One PL is underlain predominantly by granite and the remainder have mixed assemblages of both granite and greenstone. The Rwamagaza Greenstone Belt is located in the Lake Victoria Gold Belt. The southern part of the Gold Belt (the Sukumaland greenstones) consists of two concentric belts separated by granite. The inner belt, the Rwamagaza belt, comprises mainly mafic volcanics of the lower Nyanzian System with scattered remnants of BIF. The principle ore deposit in the region is the Tulawaka deposit (±1 mil ounces) owned by BEAL. Principal Structures : The Rwamagaza Greenstone Belt is an E-W trending belt. The dip of the greenstones is generally sub-vertical. This belt is renowned for its artisinal laterite workings with Matabi (±200 000 ounces) being the largest. Regionally, and crosscutting the belt in the Tulawaka area, is a set of parallel regional shear structures, referred to as the Muhama Dislocation. This dislocation can be traced from Golden Pride Mine in the Nzega Belt, through the Miyabi region and through Tulawaka. These structures are spatially related to a host of gold occurrences, including Golden Pride, Chocolate Reef, Miyabi, Nyakafuru and Tuluwaka. These structures crosscut the Rwamagaza Belt in the vicinity of Tulawaka. The loci for gold mineralization are typically at the intersection of parallel second order structures and structures with a different orientation (often N-S). Geology of the Prospecting Areas : One license has an area of 70km_ and is located approximately 10km N of Tulawaka. Reconnaissance field visits indicate no outcrop exists on this license. The Barth map indicates that the entire area is underlain by granite. But, the aeromagnetic data indicates that there may be a small area of greenstones in the SW corner of the license. Tulawaka is located in the central portion of the Archaean-age Rwamagaza Greenstone Belt. The inner arc generally hosts rocks of lower Nyanzian age, consisting of mafic to intermediate volcanics with limited felsic volcanics and Banded Iron Formations. The central sector of the greenstone belt is occasionally invaded by NE trending basic dykes of probable late Proterozoic age. Basalt - A fine to medium grained, massive, dark grey coloured rock. Minerals include pyroxene, plagioclase and quartz ± amphibole with accessory ilmenite and/or magnetite. Structurally this unit is highly jointed and fractured and has been locally foliated along contacts. Proximal to the Kakindu River it becomes more strongly foliated and sheared. Iron staining, epidote and occasionally dendretic psilomelane are common along joint/fracture planes. Silicification and epidote alteration are common with some local ferruginisation, bleaching, chlorite and muscovite alteration evident. Proximal to the granitic intrusion epidote alteration becomes more intense and pervades the entire fabric of the basalt resulting in an epidote rich rock. There is also some evidence of hydrothermal brecciation within this unit. Sulphides are limited to minor amounts of disseminated pyrite. Felsic Tuff - A fine-grained, cream to light grey coloured rock that can be separated into two distinct units. One unit consists of well-sorted, rounded, 1mm quartz grains supported by an aphanitic felsic cement. The other unit is made up of subhedral feldspar phenocrysts in a quartzofeldspathic groundmass. Both units are weakly ferruginised and have patchy psilomelane along fracture planes. Sub to euhedral (cubic) pyrite is present in trace amounts. Andesite - A fine-grained, massive, light grey coloured rock. Minerals include plagioclase, amphibole and/or pyroxene and quartz ± an unidentified red mineral. Magnetite is the accessory mineral. Structurally this unit displays a weak to moderate foliation along contacts. Silicification and epidote alteration are common with some local ferruginisation and chlorite alteration apparent. Sulphides are present in minor amounts and occur as disseminated to euhedral (cubic) pyrite. Dacite - A fine-grained, massive, intermediate rock that is light grey in colour. Minerals include plagioclase, quartz, amphibole ± biotite and an unidentified red mineral. Structurally it displays a weak to moderate foliation. It has been silicified and displays chlorite and epidote alteration. Iron staining is evident along fracture planes. Minor to moderate amounts of euhedral cubic and "devils dice" pyrite are present. Quartz Porphyry - A fine grained, porphyritic, cream to light grey coloured rock consisting of 0.5 to 3mm quartz phenocrysts in a felsic groundmass. The quartz phenocrysts are anhedral to euhedral (pyramidal) in form, and blue-grey in colour. Minor amounts of biotite are also present. Some silicification has also taken place. Alkali Granite - A medium- to coarse-grained, granitic to porphyritic textured, pinky-red coloured rock. Minerals include alkali feldspar, plagioclase, quartz and hornblende with accessory sphene. Hornblende and plagioclase display epidote alteration. Disseminated pyrite is present in trace amounts. |
©2006 Tanzanian Royalty Exploration Corporation All Rights Reserved. | Disclaimer |