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Received: 27 February 2020 Accepted: 22 May 2020 Mine wastes cause a lot of environmental problems of which seriousness depend on their polluting potential, management method, physical stability of the containment infrastructures and specific climatic conditions of the storage site. In this context, several studies have been undertaken to develop new techniques that would allow effective and sustainable management of these mine waste. The present study carried out in BétaréOya locality deals with the management of mine waste, their physical properties and their potential use in buildings and public works. These wastes are constituted of pebbles, gravel, coarse sand, fine sand and unanalyzed materials, but are poorly graded for certain sites and well graded for others. The sand fraction contained in these wastes, if we stick to their sand equivalents ranging from 88.15 to 95.2, translate very clean sand with almost total absence of fine clay. These mine wastes can be used to manufacture concrete with a poor plasticity which can be improved. The apparent density ranging from 1.665 to 1.778 and the specific weight from 2.670 to 2.751 determined show that the latter are less spoilable and denser, ideal for civil engineering works. According to the environmental requirements in force, these wastes pose almost no potential risk for constructions since there is no risk of AMD (Acidic Mine Drainage) related to sulfur. In addition, this upgrading approach makes it possible to reduce the quantities of mining wastes and thus their environmental impact while preserving non-renewable natural resources (clays, sand) intensively used in construction.

Physical Properties and Environmental Impact of Mine Waste Resulting from the Exploitation of Gold in Bétaré-Oya, Central Africa