The Kalana vein-hosted gold deposit, southern Mali

Salvi, Stefano; Sangaré, A.; Driouch, Youssef; Siebenaller, Luc; Béziat, Didier; Debat, Pierre; Féménias, Olivier

doi:10.1016/j.oregeorev.2015.10.011

Cited by 10 publications

(6 citation statements)

References 16 publications

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“…Figure 18 compares the 2D mineralization model for Douta with that for Massawa. These At the WAC scale, similar features appear in a certain number of deposits [31], notably in the Kalana metasediments [24] [65] [66], the Loulo [20] [27]…”

Section: Discussionmentioning

confidence: 90%

Lithostructural Control of the Gold Mineralization of the Douta Permit of African Star Resources (K&#233;dougou-K&#233;ni&#233;ba Inlier, Southeastern Senegal)

Ndour,

Ndiaye,

Ekra

et al. 2024

IJG

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The Douta permit of African Star Resources/Thor Explorations, located in the southeast of Senegal, in the Kédougou-Kéniéba Inlier (western part of the West African Craton), is dominated to the East by metasedimentary formations such as greywackes, shales, graphitic shales, quartzites, cherts, claystones and breccias characteristic of the Dialé-Daléma basin. To the West, the mafic formations of the Mako volcanic belt are the most common. Metasedimentary rocks are associated with metavolcanosedimentary terms found at the contact zones between the two (2) Birimian groups. These different geological formations are cut by mafic dolerite and gabbro sills and/or dykes, as well as quartz and microgranite veins. The Douta gold project is crossed from North to South by the MTZ (Main Transcurrent Zone), generally oriented NE-SW and becoming N-S towards the North. The permit is characterized by several shear corridors. The rocks are affected by brittle, brittle-ductile to ductile deformations. The gold mineralization is hosted by a NE-trending shear corridor called the Makosa corridor (Makosa shear zone), therefore sub-parallel to the MTZ. It has a subvertical dip (75˚ to 85˚ to the NW). It is associated with a hydrothermal phase characterized by quartz-sericite-epidote-fine, disseminated pyrite and arsenopyrite ± albite ± chlorite paragenesis. These minerals testify to the existence of a low degree of metamorphism (greenschist facies, epizonal domain) in the area. However, metamorphism reaches amphibolite facies in some places, particularly in the vicinity of intrusive bodies, with the presence of hornblende (amphiboles) and plagioclase. The gold mineralization is mainly hosted by two (2) metasedimentary lithological units: meta-greywackes and shales.

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Section: Discussionmentioning

confidence: 90%

Lithostructural Control of the Gold Mineralization of the Douta Permit of African Star Resources (K&#233;dougou-K&#233;ni&#233;ba Inlier, Southeastern Senegal)

Ndour,

Ndiaye,

Ekra

et al. 2024

IJG

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“…These relatively minor, smalldisplacement and/or low-strain deformation events appear restricted to small parts of the Baoulé-Mossi Domain, and likely cannot be correlated across the whole region. Orogenic gold deposits that formed during this period may include the later mineralising event at the Obuasi deposit (Fougerouse et al 2017;Oliver et al 2020), gold mineralisation at the major Ahafo deposit in western-most Ghana (Baah-Danso 2011; Masurel et al 2021), the Siguiri deposit in Guinea (Lebrun et al 2017), and both mineralising events at the Kalana deposit in southern Mali (Salvi et al 2016c).…”

Section: Late Eburnean Gold Deposits (Ca 2095-2060 Ma)mentioning

confidence: 99%

Paleoproterozoic gold events in the southern West African Craton: review and synopsis

Masurel

Eglinger²,

Thébaud³

et al. 2021

Miner Deposita

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The southern part of the West African Craton includes the Baoulé-Mossi Domain, the world's premier Paleoproterozoic gold province (~10,000 metric ton gold endowment). Structural, metamorphic, and geochronological data suggest gold mineralisation occurred during three episodes that span much of the Eoeburnean and Eburnean orogenic cycles. Eoeburnean orogenic and rare skarn-hosted gold deposits formed between ca. 2200 and 2135 Ma during repeated episodes of volcanism, plutonism, and shortening, which thickened the Paleoproterozoic crust. Early Eburnean orogenic and placer gold deposits formed between ca. 2110 and 2095 Ma during inversion, metamorphism, and subsequent oblique shortening of intra-orogenic basins filled after ca. 2135 Ma. This episode of mineralisation terminated when the Baoulé-Mossi Domain docked with the Archean Kénéma-Man Domain at ca. 2095 Ma. Late Eburnean orogenic and less common intrusion-related gold deposits formed between ca. 2095 and 2060 Ma during strike-slip to oblique-slip tectonics, post-collisional high-K plutonism and crustal reworking across the western and southern Baoulé-Mossi Domain. Eoeburnean gold deposits include ca. 10 % of the gold endowment of the Baoulé-Mossi Domain, whereas the Early Eburnean and Late Eburnean deposits include ca. 50-70% and 20-40%, respectively. Here, we highlight the favourable confluence of accretion-collision tectonics, involving juvenile crust formation as well as protracted magmatic, metamorphic, and deformation histories that resulted in diachronous gold events spread over at least 100 myr throughout the Baoulé-Mossi Domain.

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“…According to [73], there are two groups of quartz veins crosscutting a bedding-parallel schistosity surface, striking N170 and dipping steeply towards the E: 1) a first set of groups which show more irregular measured strikes, roughly N-S but some of them are oriented NE-SW and others E-W; 2) a second set of groups, more homogeneous than the other, with closely spaced veinlets striking NE-SW. Both are coeval according to the authors, a point of view shared by Kusters [76] and [78].…”

Section: The Ductile-brittle Deformationmentioning

confidence: 99%

Petro-Structural Study of the Paleoproterozoic Formations of the Faboula Gold Deposit (Bougouni-Kékoro Basin, Leo-Man Shield)

Wane¹,

Ouologuem²,

N’Diaye³

et al. 2021

OJG

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The Kalana vein-hosted gold deposit, southern Mali

Cited by 10 publications

References 16 publications

Lithostructural Control of the Gold Mineralization of the Douta Permit of African Star Resources (K&#233;dougou-K&#233;ni&#233;ba Inlier, Southeastern Senegal)

Lithostructural Control of the Gold Mineralization of the Douta Permit of African Star Resources (K&#233;dougou-K&#233;ni&#233;ba Inlier, Southeastern Senegal)

Paleoproterozoic gold events in the southern West African Craton: review and synopsis

Petro-Structural Study of the Paleoproterozoic Formations of the Faboula Gold Deposit (Bougouni-Kékoro Basin, Leo-Man Shield)

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The Kalana vein-hosted gold deposit, southern Mali

Cited by 10 publications

References 16 publications

Lithostructural Control of the Gold Mineralization of the Douta Permit of African Star Resources (K&amp;#233;dougou-K&amp;#233;ni&amp;#233;ba Inlier, Southeastern Senegal)

Lithostructural Control of the Gold Mineralization of the Douta Permit of African Star Resources (K&amp;#233;dougou-K&amp;#233;ni&amp;#233;ba Inlier, Southeastern Senegal)

Paleoproterozoic gold events in the southern West African Craton: review and synopsis

Petro-Structural Study of the Paleoproterozoic Formations of the Faboula Gold Deposit (Bougouni-K&#233;koro Basin, Leo-Man Shield)

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Lithostructural Control of the Gold Mineralization of the Douta Permit of African Star Resources (Kédougou-Kéniéba Inlier, Southeastern Senegal)

Lithostructural Control of the Gold Mineralization of the Douta Permit of African Star Resources (Kédougou-Kéniéba Inlier, Southeastern Senegal)

Petro-Structural Study of the Paleoproterozoic Formations of the Faboula Gold Deposit (Bougouni-Kékoro Basin, Leo-Man Shield)