Burkina Faso

Burkina Faso

One of the largest gold producing regions in Africa

Wahgnion Exploration
Resource identification and delineation
Golden Hill Project
Advanced exploration

Overview

Teranga currently holds the fully permitted Wahgnion gold project (mine license and five exploration permits) and the 100% owned Golden Hill advanced exploration property, acquired in October 2016 as part of the acquisition of Gryphon Minerals.

Burkina Faso represents a significant portion of the West African Birimian greenstone belt exposure (approximately 22%). The country is host to a number of producing gold mines which is anticipated to increase given current levels of mineral exploration and government support for the mining industry and modern mining code. A total of 14 mines have been developed.

Teranga’s 2020 exploration budget for Burkina Faso is approximately $15 million.

Regional Geology

The geology of Burkina Faso is dominated by the Proterozoic Baoulé-Mossi Domain, which corresponds to the eastern portion of the West African Craton. Neoproterozoic to Paleozoic sedimentary rocks cover the west and southeast of the country. The Baoulé-Mossi Eburnean orogenic domain contains Birimian (Lower Proterozoic) volcanosedimentary units arranged in elongated belts and relics of the Archean basement. The belts generally trend north-northeast but form arcuate belts to the north of Ouagadougou. They are bounded by older granite gneiss terrains and have been intruded by syn-to late tectonic granite bodies.

The Birimian Supergroup has been divided into a Lower sequence comprised of wacke, argillite, and volcaniclastic rock, and an Upper sequence of basalt with interflow sedimentary rock. Post- Eburnean marine and continental sedimentary rocks unconformably overlie the Lower Proterozoic sequences.

Local Geology

The oldest greenstone rocks in southwestern Burkina Faso, and in much of the Birimian Belt, are tholeiitic to calc‐alkaline volcanic rocks, which are predominantly extrusive volcanic units that are geochemically similar to rocks from present day volcanic island arc environments. Birimian sedimentary basins are abundant across the whole Baoulé‐Mossi domain and are thought to unconformably overlie the older greenstone basement rocks.

Voluminous granitic and gneissic rocks surround the greenstone belts and are, in general, tonalites or granodiorites with a trondhjemitic affinity. More potassic, often biotite‐bearing granitic rocks were intruded later which in places have evolved to more alkaline syenitic rocks. Early Proterozoic rocks within the concession area, are interpreted to be tholeiitic to calcalkaline basalts, andesites, and volcaniclastic sediments. These units include pillow basalts, bomb agglomerates, and associated extrusive volcanic and occasional basaltic flows. These rocks probably correlate with the basal sequences in the adjacent Banfora, Houndé, and Boromo greenstone belts.

Predominantly mafic, volcano‐sedimentary packages dominate the younger parts of the local stratigraphy. Metamorphic conditions appear to have peaked at greenschist facies with occasional amphibolite facies rocks outcropping in contact aureoles around some of the intrusive rocks.