So far, the news announced today is only a temporary stoppage of construction at Pascua Lama. Barrick can continue construction after they build a water system:
"Chile's Environmental Superintendent said all construction work on Pascua-Lama must stop until Barrick builds the systems it promised to put in place for containing contaminated water."
Construction at the Pascual Lama mine has not been permanently blocked by the Chilean government. Silver Wheaton has not lost its silver stream.