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Outside the Ray Nixon Power Plant south of Colorado Springs sits 3.3 million tons of coal ash, the remnant of three decades of coal-fired power generation. Nationwide, 20 percent of that residue, called fly ash, is recycled into concrete, but the 80,000 to 100,000 tons of fly ash produced each year by Colorado Springs Utilities' two coal power plants doesn't consistently meet construction industry standards.

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After coal comes out of the ground, it typically goes on a conveyor belt to a preparation plant that is located at the mining site. The plant cleans and processes coal to remove dirt, rock, ash, sulfur, increasing the heating value of the coal.

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Apr 8, 2010 Coal ash, fertiliser and even seawater may provide nuclear fuel. to pay off Germany's first-world-war debts by extracting gold from the ocean.

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