March 27 (Reuters) - Gascoyne Resources Ltd GCY.AX :
* JAN & FEB PERFORMANCE IMPACTED BY POOR RECONCILIATION TO GEOLOGICAL MODELS & DRILL & BLAST & ORE MINING CONSTRAINTS
* PRODUCTION GUIDANCE FOR FIRST HALF OF CALENDAR YEAR 2019 REVISED TO 29,000 - 34,000 OUNCES
* PRODUCTION AND COST GUIDANCE FOR SECOND HALF OF CALENDAR YEAR 2019 REMAINS UNCHANGED
* JUNE QUARTER PRODUCTION GUIDANCE AT 17,000 - 22,000 OUNCES
* HY AISC GUIDANCE OF $1,550 - $1,875 PER OUNCE
* GOLD PRODUCTION TO DATE IN MARCH QUARTER OF 10,254 OUNCES