Argonaut Gold Extends Mineralization on Recently Acquired Fresnillo Mineral Concession Adjacent to the El Castillo Mine http://www.newswire.ca/news-releases/argonaut-gold-extends-mineralization-on-recently-acquired-fresnillo-mineral-concession-adjacent-to-the-el-castillo-mine-621599333.html TORONTO, May 8, 2017