Gran Colombia Gold Announces Wheaton Precious Metals Participation in Marketed Offering of Subscription Receipts Expected to Close on December 19, 2019 in Connection With the Spin-Off of Its Marmato Assets Not for distribution to U.S. news wire services or dissemination in the United States. TORONTO, Dec. 11, 2019 (GLOBE NEWSWIRE) -- Gran Colombia Gold Corp. (TSX: GCM; OTCQX: TPRFF) (“Gran Colombia”)...