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Corta Atalaya
Corta Atalaya is the largest open-pit mine in Europe〔 (Emed Mining gestiona reapertura al turismo de Corta Atalaya en mina Riotinto ), eleconomista.es, 2007-12-09. Accessed online 2010-01-06.〕 and was at one time the largest in the world. It is located within the city limits of Minas de Riotinto in the province of Huelva, autonomous community of Andalusia, Spain.〔 (Minas de Riotinto - Huelva ), part of (Guía de la Faja Pirítica Ibérica: Historia y Naturaleza ) (2006) on the official site of the Autonomous Andalusian Government. Accessed online 2010-01-06.〕 It is roughly elliptical in shape, long, wide, and deep.〔〔〔 "Minas de Rio Tinto. 5.000 Años de Minería",(''Bocamina'', Number 4 (1994) ). Accessed online 2010-01-06.〕 It was one of the most ambitious projects of the Rio Tinto Group. At its peak it employed 2,000 workers mining copper; it was actively mined until 1992.〔Beatriz Santacruz, (La evolución de las minas de Riotinto ), ''El Mundo Magazine'', Issue 101, 2001-09-02. Accessed online 2010-01-06.〕 Since at least 1994 it has been flooded up to the 16th ring.〔
This open-pit mine in the western part of the Masa San Dionisio〔 was begun in 1907 after major subsidence in some of the higher-altitude parts of the area two year earlier,〔〔 According to this source, the pit began in 1909, not 1907.〕 caused by the combustion of pyrites in the earlier subterranean mines. The mines were nationalized in 1954〔 but later sold back to a private company. As of October 2009, the current owner, EMED Tartessus, says they will have the mine operating again before the end of 2013.〔(EMED Mining Quarterly Report ), 2009-10-26, accessed online 2010-01-07.〕
==Geology==
Corta Atalaya is a mine in western part of the Iberian Pyrite Belt. It is part of a zone of volcanogenic massive sulfide ore deposits of Silurian to Carboniferous age which has produced significant copper, zinc, lead, gold and silver.〔Guilbert, John and Charles F. Park, Jr., ''The Geology of Ore Deposits,'' Freeman, 1986, p. 575 ISBN 0-7167-1456-6〕〔(23rd IAGS PRE-SYMPOSIUM FIELD TRIP 2007 )〕
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