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Chile glacier bill pits mines against water supply
FILE - This Wednesday, Feb. 23, 2011 file photo shows a tour boat as it passes near the snout of Spegazzini Glacier in Los Glaciares National Park in Argentina. There are dozens of glaciers in the area fed by the Southern Patagonian Ice Field, which blankets a wide swath of the Andes between Chile and Argentina. Just how to define a glacier is at the heart of a Chilean congressional battle that could determine the future of mining in the worldís largest copper-producing country. (AP Photo/Ian James, File)

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