DNHE. Borehole yields generally range from 8 to 23 m³/hour, but can exceed 100 m³/hour in the most productive layers. Quentin Masurel, Nicolas Thébaud, John Miller, Stanislav Ulrich, Kim A.A. Hein, Greg Cameron, Didier Béziat, Olivier Bruguier, James A. Davis; Sadiola Hill: A World-Class Carbonate-Hosted Gold Deposit in Mali, West Africa. The fractured horizons are around 40-45 m thick with major inflows generally occurring between 20 and 40 m depth. The depth of the water table can vary between 0 and >80 m below ground level.
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Niger is bordered by Algeria and Libya to the north, Chad to the east, Nigeria and Benin to the south, and Mali and Burkina Faso to the west. Many of these references can be accessed through the The geology map on this page shows a simplified version of the Granitic intrusions (pegmatite facies) are common in the southern regions and are often porphyritic. A the height of the Mali empire in the 13th century, the town of Timbuktu was a centre of culture, learning and Islamic religion, and Djenne was an international trade centre. More detail can be found in the references listed at the bottom of this page. DNHE. Gold mineralization is hosted by a thin (0.5-2.0 km) but regionally extensive sequence of basalt and andesite, interbedded graywacke and argillite, and andesitic-lamprophyric intrusions. Pages in category "Geology of Mali" The following 5 pages are in this category, out of 5 total. Stratigraphie, tectonique, métamorphisme- Mémoire BRGM n° 53. The southern part of Mali is characterised by savannah, encompassing the large inland delta of the Niger River. These deep aquifer systems are often overlain by shallow superficial Quaternary aquifers, which in some cases are in hydraulic continuity with the deposits below, or may act as perched systems.
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For more information on the map development and datasets see the Major surface water features of Mali. These are important agricultural zones. A network of 230 groundwater level observation boreholes was established in central and southern Mali by the UNDP between 1981 and 1991. The highest point is Hombori Tondo (1153 m), located in central Mali; there are also upland areas in the north east along the border with Algeria. The extent of higher permeability sandstone layers is not well defined, because of a lack of borehole data. Boreholes are typically drilled to depths of 50-150 m. Géologie et hydrogéologie des plateaux mandingues, Mali, (Région de Koula Nossombougou) Thèse 3ème cycle, Université Scientifique et Médicale de Grénoble, France Mali has 100 cubic kilometers of total renewable water resources as off 2011 estimates.Mali faces numerous environmental challenges, including Transmissivity is generally reported between 25 and 500 m²/day, but can reach >4000 m²/day under certain conditions. The territory encompasses three natural Deeper aquifers can be vulnerable to contamination if there is a hydraulic connection between the shallow and deep systems. The Niger River creates a large and fertile inland delta as it arcs northeast through Mali from Guinea before turning south and eventually emptying into the Gulf of Guinea. Search for other works by this author on:
Mali also has huge stores of groundwater in major aquifer systems, with a mix of fossil and actively recharged groundwater.
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Average recharge is estimated at around 5 mm/year, which equates to approximately 16% of average annual precipitation. You could not be signed in. Intergranular aquifers are generally associated with poorly consolidated or unconsolidated sediments in the large sedimentary basins of eastern and northern Mali. The climate of Mali transitions from tropical savannah in the south, to hot arid steppe and hot arid desert in the north.
This site uses cookies. Groundwater quality in Mali can be divided into three broad regions: Géologie du Gourma (Afrique occidentale). Search for other works by this author on:
Latitude & Longitude
Boreholes are typically drilled to 50-80 m depth, with a maximum depth of 242 m recorded. Several zones can be distinguished in this aquifer system:
The Upper Cretaceous/Eocene marine sediments are generally considered a poorly productive aquifer. Map developed from World Wildlife Fund HydroSHEDS; Digital Chart of the World drainage; and FAO Inland Water Bodies.
You do not currently have access to this article. For more information on the map see the Consolidated Sedimentary Aquifer - Intergranular & Fracture FlowConsolidated Sedimentary Aquifer - Intergranular & Fracture Flow
The lithostratigraphy of the open pit consists of impure limestones overlain by younger sequences of detrital sedimentary rocks, which include arenite, wacke, and siltstone. The Ministry of Environment and Sanitation, through the Department of Sanitation, Pollution, and Nuisance Control, is responsible for all legislation related to sanitation standards and pollution. Further water and related statistics can be accessed at the This section provides a summary of the geology of Mali. Mali is endowed with bauxite, copper, diamonds, gold, Granite, gypsum, iron ore, kaolin, limestone, Sixty-five percent of Mali's land area is desert or semi-desert.