Sept 12 (Reuters) - Yamana Gold Inc YRI.TO :
* YAMANA GOLD LOCKS-IN FOREIGN EXCHANGE BENEFITS AND IS POSITIONED TO DELIVER EXPECTED STEP CHANGE IN CASH FLOW
* YAMANA GOLD -PROVIDED DETAILS ON ADDITIONS TO FOREIGN EXCHANGE HEDGING PROGRAM & POTENTIAL IMPACTS OF ANNOUNCED IMPOSITION OF EXPORT TAX IN ARGENTINA
* YAMANA GOLD INC - CONTINUES TO BE WELL POSITIONED TO GENERATE A STEP CHANGE IN CASH FLOW IN 2019
* YAMANA GOLD INC - HAS ENTERED INTO OPTION CONTRACTS RELATING TO A PORTION OF ITS EXPOSURE TO BRAZILIAN REAIS IN 2019
* YAMANA GOLD INC - CO' S UNITS "WILL CHALLENGE CONSTITUTIONALITY OF EXECUTIVE ORDER" THAT ESTABLISH EXPORT TAX OF 12% OVER EXPORTS FROM ARGENTINA