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Location: 25 km SW from Safane, Burkina Faso
Sector 13, Babanguida Avenue Benda Street, Door # 211OuagadougouBurkina Faso
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The Mana district is located in the northern part of the Houndé greenstone belt. Five gold deposits, Wona, Nyafé, Fofina, Yaho and Siou, are hosted in different rock types. The lithostratigraphic succession is typical of greenstone belts and is characterised at the base by a major tholeiitic basaltic suite, with some intercalations of argillic sedimentary rocks that are overlain by predominant pelagic and detrital sedimentary rocks (shale, sandstones, greywacke and volcanoclastics). The Mana district basalt unit has undergone submarine hydrothermal alteration with epidote, chlorite and local albite, and shows zones of strong silicification, some of which are anomalous in gold. The Paleoproterozoic formations are affected by polyphase deformation and greenschist facies metamorphism with amphibolite facies assemblages that locally occur as metamorphic aureoles around some later formed granitoids.All deposits on the Mana property are characteristic of typical West African, shear-hosted orogenic gold deposits. The major sulphides associated with the gold mineralisation are pyrite and arsenopyrite. Free visible gold is encountered at the Wona and Siou deposits. Magnetite occurs as small millimetric prisms along schistosity planes in the walls of mineralised zones. The five major deposits of the Mana property are described herein.The Wona deposit is hosted in a series of deformed sedimentary, volcano-sedimentary and metavolcanic rocks. The gold mineralisation has developed along a major northeast-southwest subvertical fault zone of regional extent. The shear zone is about 200 m wide in the Wona pit sector. The original stratigraphic sequence is a succession of pelitic sediments with graphitic horizons and volcanoclastics. They have been affected by a pervasive schistosity associated with vertical movements along the fault (the east block rising with respect to the west one) as well as sinistral lateral movements. Those foliated rocks are cut by mafic to intermediate dykes. The mineralisation appears to be associated with movement along the fault accompanied by hydrothermal fluid circulation and intense silicification.The Nyafé and related Filon 67 deposits are hosted in a purely volcanic sequence of basalt and mafic tuffs. The original stratigraphic sequence is sub-horizontal and overturned, with pillow lava at the bottom, pillow breccias and finally massive lava at the top. Several subvertical decimetre scale dykes crosscut the volcanic sequence. The Filon 67 (F67) deposit, adjacent to Nyafé is composed of quartz veins associated to shear zones, with dextral motion within a package of greenschist rocks. These composite veins show textures indicative of several successive phases of mineralisation. The Fofina deposit is divided into two sectors separated by a zone of volcaniclastic/mafic volcanic rocks. The western zones are located in a sheared sedimentary unit dipping moderately west and trending north-northeast. They are related to a rheological contact with a massive basalt unit to the east. The eastern zones are within the basaltic lavas and have similar characteristics to the Nyafé deposit. The Yaho deposit is hosted in a wide north-striking and steeply west-dipping sandstone unit flanked by shales and siltstones to the west and basaltic flows to the east. The mineralisation is associated with silicified and sericitized corridors within the sandstone which also contain increased amounts of sulphides (pyrite and arsenopyrite). The Siou deposit is a typical shear-hosted quartz vein deposit. The two principal zones are the Siou and No. 9 zones. The Siou zone is hosted in a single quartz vein located within the Siou Granitic Intrusive, but near the contact with sandstones and shales to the west. The No. 9 zone is located at the contact between the sediments and the Siou Intrusive and generally consists of quartz veining and veinlets intruding the granitic intrusive. Both the Siou and No. 9 zones are north-striking and moderately east-dipping.
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