Sierra Iron Ore Corp. Joins OTCQX

NEW YORK, June 18, 2012 /PRNewswire/ -- OTC Markets Group Inc. (OTCQX: OTCM), the company that operates the world's largest electronic marketplace for OTC-traded equities, today announced that Sierra Iron Ore Corp. (OTCQX: SIOCF; TSX-V: NAA), a company engaged in the identification, acquisition, and exploration of precious metal resources in Mexico and Canada., is now trading on the highest tier of the OTC market, OTCQX®.