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Sedimentological Characterization of Alluvial Gold Deposits of Betrare-Oya and Its Surroundings (Cameroon Eastern Region)

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Document pages: 17 pages

Abstract: Sedimentological methods such as granulometry,morphoscopy and heavy minerals analysis have been carried out to characterizealluvial gold deposits of Betare-Oya and its surroundings, with the aim todetermine their origin and conditions in which they are formed and also todetermine the mineralogical content of these deposits, their nature anddistribution. It came out from this study the following: The alluvial depositsstudied are sand, constituting of coarse fraction (grains), medium grains inabundant and fine grains. The average values of sorting index (S0) andcoefficient of asymmetry (A) are respectively 2.53 and 0.73. These values indicatethat the sand is poorly arranged and poorly sorted with a better classificationor arrangement in the coarse fraction (grains). These are sediments that aredeposited together by high competent currents. It would therefore probably betorrential deposits and or streams from short transport. Unused grains aredominating (80.5 ) which translate a proximal source of the sediments. So itwould be probably from the dismantling of the surrounding landforms. The heavyminerals studied revealed the presence of the following minerals; zircon, gold,sphene, green hornblende, tourmaline, rutile, augite, hypersthene, sillimanite,glau-cophane, biotite, staurotide, and the opaque. These minerals belong to thecortege of plutonic and metamorphic rocks from a single proximal distributing province.

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