UPDATE 3-Junior miners Strandline, Black Rock, OreCorp sign agreements with Tanzania
* Junior miners sign agreements at ceremony in capital* Petra Diamonds gives govt 16% free carried interest* Petra's stake in Williamson mine to fall from 75% to 63% (Adds Petra Diamonds signed agreement)By Nuzulack DausenDAR ES SALAAM, Dec 13 (Reut...
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