The present article is devoted to the development of a hematite-poor ore mine in Ouenza, which does not meet the steelmaker's requirements. Significant volumes are stored at the pithead of the mine, and the reserves are estimated at over 100 million tones. This enormous quantity of mining waste occupies an important space and poses a real threat to the environment as well as for the mining city of Ouenza. In order to solve these socio-economic and environmental problems, a sustainable development and a better quality of life for inhabitants of this region is needed. For this, representative samples were taken at the level of the dumps. Taking into account the natural characteristics of the stock namely; mineralogical composition, iron content, particle size of the rock mass, as well as the release mesh of iron minerals from the gangue. Firstly, tests are conducted on the recovery by radiometric separation of iron-rich pieces and graded. Then the rest of the ore was subjected to mechanical preparation followed by enrichment, which will be the subject of another study. The research is conducted on samples to determine the optimal parameters of the γ-rays absorption tested by radiometry; these parameters were the velocity of the conveyor belt and the time of exposure to γ-rays. The obtained results by this valorization process are very significant: iron content 53.5% and 8.3% recovery.

Mining processes in the iron ore mine of Boukhadra, Tebessa (NE Algeria) generated thousands of tons of mining wastes every year, which represents a real threat to the environment, leading to hazardous effects for the resident population of the region. The aim of this study is the selective sorting of the Boukhadra mining wastes for valorization. This will facilitate the recycling of the mineral substances (limestone, iron, marls) on the one hand and it makes it possible to minimize the volume of stocks and their environmental impacts on the other hand. To do this, and taking into account the chemical properties of wastes, we recommend an optical separation management using a color camera and a microprocessor linked to the ejection system (valve or pump), the color measurement tests performed on Boukhadra waste rocks samples using Matlab codes converted from Algorithms showed that each rock has a specific color (Red Green Blue value) or RGB. For this purpose, the use of three optical separators that sort according to algorithmic commands (RGB interval) will contribute to the separation of the Boukhadra mining wastes and consequently simplify their reuse.

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Purpose. Assessment of dust pollution and analysis of aeroparticles generated during operations at the quarry of Kef Bouacida aggregates, located in Oued El Aneb Annaba northeastern of Algeria. Methodology. Measurement and monitoring of dust fallen, taken from the quarry site allowed identifying the forms and characteristics of the collected particles. These measurements were performed according to the French AFNOR NF X 43007 standards on measurement of dry atmospheric deposition by the method of platelet deposition. findings. The results obtained during the dust fall show that these measures (83.34 g/m²/month) are much high er than the reference values of 30 g/m²/ month in the AFNOR NFX43007, to the German standard TALUFT (10.5 g/m²/month) and the Swiss OPair law (6 g/m²/month). For this reason, containment methods and measures intended to limit, prevent and eliminate the consequences of the production on the environment are suggested. originality. The evaluation of the adverse effects related to mining production, in particular the nuisance of dust, which can contribute to sensitizing the fight against these negative impacts on the environment, health and safety of the local population, and also increase environmental preservation actions and sustainable development. Practical value. The reduction of fine particle emissions is the greatest environmental challenge that the Algerian mining faces. The effects assessment of mining of granite on the environment, and the description of the difficulties of dust propagation, can be maintained by reduction measures to fight this nuisance, which poses safety and health problems for staff, accelerates the wear of equipment, and affects the quality of materials, not to mention the incon venience to residents and farmers. This study is part of the development of environmental protection and conservation of natural resources.