April 18 (Reuters) - Sandfire Resources NL SFR.AX :
* FY2019 GUIDANCE STRENGTHENED, EXPECTS 66-68KT CU AND 40-42KOZ AU
* QUARTERLY GOLD PRODUCTION 10,921 OZ VERSUS 10,427 OZ IN DECEMBER QUARTER
* MARCH 2019 QUARTER COPPER PRODUCTION 16,062 TONNES VERSUS DECEMBER 2018 QUARTER PRODUCTION 16,888 TONNES