BUZZ-Sherritt International: Shares jump as U.S. to shift Cuba policy
** Canadian miner's shares up 22.9 pct to C$2.79
** Shares of largest independent energy producer in Cuba jump with U.S. President Barack Obama set to announce shift in policy toward Cuba
** Policy changes to include opening of embassy in Cuba and starting talks to normalize relations
** Some Sherritt officers and directors are barred from the United States because of sanctions against companies trading with Cuba
** Stock posts biggest intraday jump in 5-and-a-half years
** Up to Tuesday's close, stock had risen nearly 15 pct on the Toronto Stock Exchange this year
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