A 120 yr record of widespread contamination from mining of the Iberian pyrite belt

Publication Type  Journal Article
Year of Publication  1997
Authors  Van Geen, A.; Adkins, J. F.; Boyle, E. A.; Nelson, C. H.; Palanques, A.
Journal Title  Geology
Volume  25
Issue  4
Pages  291-294
Journal Date  Apr
ISBN Number  0091-7613
Accession Number  ISI:A1997WU31900001
Key Words  massive sulfide deposits; trace-metal enrichments; mediterranean-sea; spain; water; drainage; tinto; gulf

A metal-enriched seawater plume entering the western Mediterranean Sea through the Strait of Gibraltar originates 300 km to the west in the Rio Tinto estuary of southwestern Spain, Mining of Rio Tinto ore, one of the largest metal-rich sulfide deposits in the world, started well before Roman times, Contemporary Rio Tinto waters draining the region are highly acidic (pH 2.5) with dissolved cadmium, zinc, and copper concentrations 10(5)-10(6) times higher than in uncontaminated surface water of the Gulf of Cadiz, Two dated sediment cores from the Spanish continental shelf show that metal inputs to the region increased with the onset of intensive mining activities during the second half of the 19th century, Although the impact of mining may have decreased over the past few decades, the Tinto river and estuary remain highly contaminated.


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URL  <Go to ISI>://A1997WU31900001