This study concerns the assessment of the soil quality of a mining site in the Congolese Copperbelt (Democratic Republic of Congo) with the aim of identifying possible pollution from mining. The site concerned is in Kipushi in the southwest of the city of Lubumbashi and has been the subject of mining since 1924 before being shut down in 1993. The methodology adopted consisted of a sampling campaign and in-situ measurements followed by chemical analyzes in the laboratory. The samples were taken using hand augers to a depth between 0 and 30 cm, the permeability was determined by means of percolation test by the constant level method or the Porchet method and the analyzes Elemental chemicals were performed by atomic absorption spectrometry. Regarding the pH, the results obtained indicate that the soil is acidic in several places and therefore has a great capacity to mobilize ETM. From the point of view of agronomic value, the results show that on the whole site, the soil is poor in organic matter (OM); the average value is 1.64% which reflects an extremely low bacterial activity. As for the elemental chemical composition, the results obtained indicate significant concentrations of trace metal elements (TME) attributable to the mining activity developed on the site for nearly 70 years. These are: Fe (23,400 - 88,300 ppm), Cd (100 - 1,400 ppm), Co (100 - 6,600 ppm), Cu (9,700 - 60,800 ppm), Pb (100 - 19,400 ppm) and Zn (22,400 - 108,100 ppm).

Two drying techniques (solar and oven) were used to dry a variety of commercially mature mango. We have a drying efficiency of 33% for sun dried mango (SDM) versus 26% for oven dried mango (ODM); the relative humidity is 14.17% ± 0.01 for SDM compared with 8.25% ± 0.01 for ODM. We observe a decrease in dry matter for SDM compared to ODM. Mango dried in the sun has a high concentration of vitamin B6 and C; in mineral elements (Ca, Mg and Fe). But we also noted the presence of vitamins (A, D and E) after the drying operations. For microbiological parameters, we obtained results meeting the limits set by the ISO 4833 standard which governs the microbiology of the food chain. The method of solar drying in view of the results obtained proves to be the one that boosts the nutritional properties of mango.