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OTC Markets Group Welcomes Blackrock Silver Corp. to OTCQX

NEW YORK, April 28, 2021 /PRNewswire/ -- OTC Markets Group Inc. (OTCQX:OTCM), operator of financial markets for 11,000 U.S. and global securities, today announced Blackrock Silver Corp. (TSXV:BRC, FRA: AHZ0, OTCQX:BKRRF), an acquisition, exploration an