— the river running the colour of rust.
“A river in southern Spain that runs red. About a hundred kilometres long, draining the Sierra Morena into the Gulf of Cádiz at Huelva. Five thousand years of copper and silver mining have left the water acidic and dense with dissolved iron, and the riverbed reads the colour of dried blood. NASA studies it as a Mars analogue.
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The Río Tinto rises in the Sierra Morena of Andalusia and runs about a hundred kilometres south-west to its estuary with the Río Odiel at Huelva on the Gulf of Cádiz. The river takes its colour from the upper basin around Minas de Riotinto, where deposits of iron pyrite, copper, and other sulphides have been worked since the third millennium BC. Phoenician, Roman, and Spanish operators all mined here; the modern Rio Tinto Group, founded in 1873, took its name directly from the river.
The colour is the result of an extreme chemistry. The water carries a pH around 2 — closer to vinegar than to a normal river — and is heavy with dissolved iron and sulphates leached from the surrounding sulphide deposits. The iron oxidises as the water moves, and the riverbed reads ochre, rust, and oxblood depending on the depth and the light. The same conditions support acidophilic microbes that NASA's astrobiology programme studies as analogues for possible life on early Mars.
The upper river runs through one of the oldest continuously worked mining districts in the world. The open pits at Cerro Colorado and Corta Atalaya near Minas de Riotinto were cut into mountains the Romans had already hollowed; Corta Atalaya was, when active, among the largest open-pit copper mines in Europe. The Parque Minero de Riotinto preserves an Edwardian-era English company village built around the mines and runs a narrow-gauge tourist train along the riverbank where the colour reads strongest in the afternoon light.