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animas river spill irresponsible epa john batchelor mp3

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Animas River spill evidences global risk. Karen Hudson-Edwards. Department of Earth and Planetary Sciences, Birkbeck, University of London John Batchelor Podcast May 5, 2016 SEED SEED SEED “…There are many examples of historical and contemporary mine wastes posing threats to the environment. For example, in August 2015, waste water and tailings from the Gold Creek Mine flooded into Cement Creek and the Animas River in Colorado, USA, turning them bright yellow. The spill was caused by the attempted remediation of historical mine wastes (7). “Contemporary tailings dam spills often affect river basins that have a legacy of historical contamination. On 25 April 1998, the Aznalcollar spill released ~4 to 5 million m3 of liquid and tailings bearing arsenic, copper, lead, and zinc to the Río Guadiamar in southwestern Spain (1). The tailings from the spill were removed from the floodplain during several cleanup operations, but later research revealed older contaminated alluvium underneath. As the river channel readjusted following the 1998 spill, this historically contaminated sediment was eroded and carried downstream toward Doñana National Park, a UNESCO World Heritage Site (8). “Perhaps the most infamous historical mine wastes are those in the Río Tinto Mining District in Andalusia, Spain. Here, more than 5000 years of mining and natural weathering of the sulfide ores have created a strongly acidic (pH < 3) 90-km-long river that bears arsenic, iron, copper, cadmium, nickel, lead, and zinc. Huge piles of waste rock have built up at its headwaters, and redand yellow-colored alluvium is found along its banks. Gross metal fluxes from historical wastes of the Río Tinto Mining District have a substantial impact on global and local element fluxes: According to calculations by Braungardt et al., 8.1% of the dissolved zinc flux and 1.6% of the dissolved copper flux in global rivers come from the Río Tinto (9). Resuspended mine waste dust from the Río Tinto area supplies 32% of the antimony, arsenic, bismuth, cadmium, copper, lead, and zinc to the local atmosphere (4), although the mean composition of these elements is below the daily EU limit value of 50 µg m−3….” http://science.sciencemag.org/content/352/6283/288.full The John Batchelor Show https://en.wikipedia.org/wiki/2015_Gold_King_Mine_waste_water_spill http://johnbatchelorshow.com/

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