** Shares of precious metals miner Acacia Mining fall 5.95% to 150 pence - among top percentage losers on the FTSE 250 index
** Majority owner Barrick Gold Corp proposed to acquire all of the shares it does not already own in Acacia in stock
** ABX’s proposal values Acacia at $787 mln
** Traders say ABX proposal at a ~5% discount to ACAA’s current share price
** ACAA says it remained out of the discussions between ABX and Govt of Tanzania on a tax dispute
** An outcome whereby Acacia could return to a normalised operating environment in Tanzania appears increasingly unlikely, says Jefferies
** ACAA has fallen 17.5% so far this year (Reporting by Karina Dsouza in Bengaluru)
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