** Shares of Perpetua Resources PPTA.O rise 2.3% to $13.06 premarket
** Company says it has received the final federal permit for its Idaho antimony and gold Stibnite project from the United States Army Corps of Engineers
** The Pentagon-backed mine would be the US' first antimony project
** PPTA says the project holds roughly 148 million pounds of antimony reserves and could meet about 35% of U.S. antimony demand during its first six years of production
** Co says the project is expected to produce 450,000 ounces of gold annually over its first four years of production
** As of last close, shares up ~20% YTD
(Reporting by Sumit Saha in Bengaluru)
((Sumit.Saha@thomsonreuters.com;))