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OTC Markets Group Welcomes Summa Silver Corp. to OTCQX

NEW YORK, June 15, 2022 (GLOBE NEWSWIRE) -- OTC Markets Group Inc. (OTCQX:OTCM), operator of regulated markets for 12,000 U.S. and international securities, today announced Summa Silver Corp. (TSXV:SSVR, OTCQX:SSVRF), a Canadian junior mineral explorat