Higher imports by the world's second-biggest bullion consumer could support benchmark gold prices, which have corrected nearly 17% from an all-time high of $2,072 in August.
Scientists say coal ash from the Punta Catalina power plant revealed high concentrations of arsenic, selenium and other potentially harmful heavy metals.
Company has entered into a definitive agreement with Big Ridge Gold, allowing the explorer to earn up to an 80% stake in the past-producing Hope Brook gold project.
Years of neglecting its critical metal supplies is catching up with the United States, as demand for the raw materials needed to build a new green economy that rejects fossil fuels gears up.