Abstract
The tailings pond at Sillamae, Estonia, is an oval retention impoundment on the waterfront of the Gulf of Finland, with an overall area of about 330,000 m2 [1]. The top of the dam is about 25 m above sea level and a tailings pond containing about 150,000 m3 of acid wastewater covers about 30% of the area. The tailings pond contains about 8 million m3 of wastes, including uranium tailings, oil-shale fly ash, and loparite ore processing tailings. Environmental concerns include the stability of the dike, leaching of uranium and toxic heavy metals into the ground water and into the Gulf of Finland, and radon and dust emissions from the wastes.
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