NEW YORK, April 4, 2013 /PRNewswire/ -- OTC Markets Group Inc. (OTCQX: OTCM), operator of Open, Transparent and Connected financial marketplaces, today announced that Excalibur Resources Ltd. (OTCQX: EXCFF; CNSX: XBR), a Toronto-based emerging junior gold producer, has chosen to trade on OTCQX®, the best OTC marketplace with qualified
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