Abstract
The Ribeira Valley region was the scene of intense mining activity, nine mines have been exploited, whose main focus of interest was to obtain Pb, alternatively, Ag and Zn. Mining waste (enriched in As, Cd, Pb, Cu, Cr, and Zn) were deposited in the form of pile directly on the ground without any prior treatment for about 4 years (1991-1995).In this context, this project aims to characteri…