Rio Alto and Sulliden to combine to create a leading Americas focused mid-tier gold producer

TORONTO, May 21, 2014/ - Rio Alto Mining Limited ( Rio Alto  or the Company ) (TSX & BVL: RIO, NYSE: RIOM) and Sulliden Gold Corporation Ltd. ( Sulliden ) (TSX & BVL: SUE, OTCQX: SDDDF) jointly announce that they have signed a binding letter agreement (the Agreement ) to combine their respective businesses (the Transaction ) and create a new, leading mid-tier gold producer with operations focused in a world-class gold mining district in Peru. The Transaction combines Rio Alto s currently producing, low cost La Arena gold oxide mine and adjoining sulphide copper-gold deposit with Sulliden s low cost, scalable Shahuindo gold development project located in Cajabamba, northern Peru. The Transaction will create a leading, mid-tier gold producer with near-term production potential of approximately 300,000 ounces of gold per year and the opportunity to materially expand production in the near-term while maintaining attractive and sustainably low cash costs.  Sulliden completed a
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