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This paper presents some initial results from the Instituto Tecnologico Geominero de Espana's (ITGE) study of the Aznalcollar mine spill. The spatial distribution of the pyritic sludge released was surveyed by using remote sensing data, aerial photography, and more than 700 field measurements on the sludge thickness. Initial estimation of the extent of the sludge was provided by radar data. Maps at...
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