POLITICS Obama Blocks Mining Outside Yellowstone National Park By Michael Bastasch The Daily Caller Published November 21, 2016 1:56pm EST | Updated December 19, 2016 9:08am EST {{#rendered}} {{/rendered}} The Grand Prismatic Spring, the largest in the United States and third largest in the world, is seen in Yellowstone National Park, Wyoming, June 22, 2011. Picture taken June 22, 2011. REUTERS/Jim Urquhart/File Photo