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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. Since ancient times, a site along the river has been mined for copper, silver, gold, and other minerals.〔 〕 In approximately 3,000 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, 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 multinational 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 mining companies, although it no longer controls the Rio Tinto mines; these are now owned by EMED Mining plc. ==History== 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 $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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rio Tinto (river)」の詳細全文を読む スポンサード リンク
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