The origin of gold was formed as a result of disintegration of primary gold deposits in the process of physical and chemical weathering.  In a vast number of cases the river alluvium of Plains Rivers is composed of properly washed sands of various granularity.  At its basis there are coarse grained deposits, coarse sands with inclusions of gravel and pebbles.

 Homogeneously fine sands are situated above, which in their turn are overlaid by sands of the fine-grained variety.  Trap sites, such as meander, river bands, and waterfalls can play an important role in gold concentration

Central Africa has vast undeveloped mineral resources included bauxite, copper, chromium, diamond, granite, gypsum, iron ore, kaolinite, lead, lithium, manganese, marble, nickel, niobium, palladium, phosphate rock, rutile, talc, tin, titanium, thorium, tungsten, silver, uranium, and zirconium.  Other mineral commodities are not produced in significant quantities, except for rock salt and semiprecious stones, (epidote, garnet, prehnite, and quartz).  Diamonds have been produced in small quantities, mostly as a by-product of gold mining.