- location Gulf of Cádiz Basin area 739 km² Province Province of Huelva Country Spain | Length 100 km Source Sierra Morena Mouth Gulf of Cádiz | |
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Similar La Rábida Friary, Muelle de Riotinto, Doñana National Park, Wharf of the Caravels, Monumento a Colón | ||
The Río Tinto ([ˈri.o ˈtinto], red river) is a river in southwestern Spain that originates in the Sierra Morena mountains of Andalusia. It flows generally south-southwest, reaching the Gulf of Cádiz at Huelva.
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Map of Rio Tinto, Huelva, Spain
Since ancient times, a site along the river has been mined for copper, silver, gold, and other minerals. In approximately 3000 BC, Iberians and Tartessians began mining the site, followed by the Phoenicians, Greeks, Romans, Visigoths, and Moors. After a period of abandonment, the mines were rediscovered in 1556 and the Spanish government began operating them once again in 1724. As a possible result of the mining, the Río Tinto is notable for being very acidic (pH 2) and its deep reddish hue is due to iron dissolved in the water. Acid mine drainage from the mines leads to severe environmental problems due to the heavy metal concentrations in the river. In 1873, the Rio Tinto Company was formed to operate the mines; by the end of the 20th century it had become one of the world's largest multinational mining companies, although it no longer controls the Río Tinto mines; these are now owned by EMED Mining.
HistoryEdit
The ore body was deposited in the Carboniferous (300–350 Ma) by hydrothermal activities on the sea floor. The river area has a history of mining activity since the Tartessans and the Iberians started mining in 3000 BC. The mining continued over the Phoenician era and under the Roman Empire until the second part of the 15th century: primarily for copper but also for iron and manganese. In the nineteenth century the mining operation started on a large scale mining companies from the United Kingdom. After the peak of production in 1930, production declined and ended in 1986 for copper mining and in 1996 for silver and gold mining. The mine closed in 2001. Increased copper prices in the 2010s led to efforts by EMED Mining to reopen the mine, but difficulties in acquiring all property rights necessary, environmental concerns, and obtaining regulatory approval delayed reopening. The mine, which employed as many as 20,000 in the past, would employ 350 people during its startup phase. The firm acquired US$250 million in financing for the project. Environmental concerns are centered on disused water reservoirs which might not be able to withstand the stress of renewed waste inputs.
AstrobiologyEdit
This river has gained recent scientific interest due to the presence of extremophile anaerobic bacteria that dwell in the water. (Similar extremophile archaea are Archaeal Richmond Mine Acidophilic Nanoorganisms.) The subsurface rocks on the river bed contain iron and sulfide minerals on which the bacteria feed. The extreme conditions in the river may be analogous to other locations in the solar system thought to contain liquid water, such as subterranean Mars. NASA scientists have also directly compared the chemistry of the water in which the rocks of Meridiani Planum were deposited in the past with the Río Tinto. Likewise Jupiter's moon Europa is theorized to contain an acidic ocean of water underneath its ice surface. Thus the river is of interest to astrobiologists.
Based partially on research done near the Río Tinto, two NASA scientists were reported saying on February 2005 that they had found strong evidence of present life on Mars. NASA officials denied the scientists’ claims shortly after they were released, and one of the scientists, Carol Stoker, said she was misquoted at the party in which the initial statement was made.