- Unconformity type polymetallic deposit located at unconformity between Taoudeni Carboniferous- Neoproterozoic Basin and Birimian Greenstones
Falea - Mali
Summary
Project Description
Falea polymetallic (uranium, silver, and copper) deposit is located in Mali, West Africa approximately 350 km west of Bamako, the capital of Mali, and approximately 240 km south of the city of Kayes. The nearest town is Kenieba, which is an 80 km drive north from the project area. GoviEx acquired the Property from Denison Mines Corp. (Denison) in June 2016.
Most of the mineralization at Falea occurs in the flat lying Kania sandstone, which is underlain and overlain by argillaceous units. The Kania sandstone is located near the bottom of the Taoudeni Basin sequence. The mineralization is interpreted as an unconformity type uranium deposit, since it is associated with the unconformity between the Kania sandstone and the underlying Birimian greenstones.
Geological Settings
The Falea deposit is interpreted as an unconformity-associated uranium deposit. It occurs at or just above the unconformity between the Birimian and overlying sedimentary sequences, within the Kania Sandstone as well as the underlying basal conglomerate. It is interpreted that proximity to the Road Fault, a reverse fault that strike North-South could have introduced enriched fluids into the sandstones.
Unconformity-associated deposits are high-grade concentrations of uranium that are located at or near the unconformity between relatively undeformed quartz rich sandstone basins and underlying metamorphic basement rocks.
The compositional spectrum of unconformity-associated uranium deposits can be described in terms of monometallic (simple) and polymetallic (complex) end-members on the basis of associated metals. Polymetallic deposits are typically hosted by sandstone and conglomerate, situated within 25 m to 50 m of the basement unconformity. Polymetallic ores are characterized by anomalous concentrations of sulphide and arsenide minerals containing significant amounts of nickel, cobalt, lead, zinc, and molybdenum. Some deposits also contain elevated concentrations of gold, silver, selenium, and platinum-group elements.