An Abandoned gold mining area in Portugal: environmental impacts and human health risks
An Abandoned gold mining area in Portugal: environmental impacts and human health risks The old mine of Escádia Grande, located 11 kms south of Góis, Coimbra district, central Portugal was exploited for Au and Ag and was active at the midle of the 1900. Between 1939 and 1952 about 42878 tonnes of material were treated. The mineralized quartz veins consist of quartz, arsenopyrite, pyrite, chalcopyrite, galena, sphalerite, gold and argentite. The Góis relief is extremely vigorous, with the high altitudes reaching 1000 meters and the lowest 200 meters. The mine dumps were deposited close to the stream and a river beach was created 2 km downstream. The waters have circum -neutral pH values and contained up to 284 μ g/L of As. The As concentrations decrease to downstream of mine dumps. The geoc hemical modelling carried out by Phreeq ...

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