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Major environmental problems in metallic mining areas come from the hazard of metal&#x0D;pollution of surrounding areas. Therefore, an appropriated management of these soils is&#x0D;necessary for minimizing the associated risks. Some properties of mining soils, such as&#x0D;elevated metal concentrations, pH and shortage of essential nutrients make them a poor&#x0D;medium for organism growth. Therefore, in order to make a stabilization of these mining&#x0D;areas, it is necessary to solve previously some adverse physical and chemical soil factors&#x0D;mainly associated to toxic heavy metals and soil structure. Thus, some wastes such as&#x0D;carbonate, demolition wastes and sewage sludge, were added to soils to provide the needed&#x0D;conditions for improving soil conditions. The aim of this research was to assess the soil&#x0D;evolution after amendments addition in a research area placed in the Cartagena-La Unión&#x0D;Mining District, SE Spain. This assessment was carried out by means of microbial community&#x0D;evolution and variation as an indicator of soil changes. Mining soils showed, in general, low&#x0D;numbers of microorganisms, and significant increases in microbial populations were observed&#x0D;after soil treatment.

Assessment of mining soil improvement after construction and demolition wastes amendment additions evaluated by microbiological analysis