IAMGOLD confirms option agreement on La Arena and equity position in Mexican Silver Mines (IAG) 10.30 -0.18 : Co announced it has acquired 8,024,511 common shares and 1,500,000 warrants of Mexican Silver Mines having had the same number of common shares and warrants of Rio Alto Mining Limited immediately prior to the amalgamation with Mexican Silver announced on June 29, 2009. Co now owns ~10.62% of the common shares of Mexican Silver issued and outstanding and, if it were to exercise its warrants to purchase common shares, would own ~12.36% of the common shares of Mexican Silver issued and outstanding (on a partially diluted basis). The terms of the option and earn-in agreement provide Rio Alto with an option to purchase all of the shares of La Arena S.A. held by IAMGOLD for cash payments of US$47.55 million and the right to earn up to 38.7% of the shares of La Arena S.A. by incurring expenditures of up to US$30 million on the La Arena project.