Feb 16 (Reuters) - OceanaGold Corp OGC.AX :
* OGC PROVIDES UPDATE ON MARTHA UNDERGROUND AT WAIHI, NZ-OGC.AX
* MARTHA UNDERGROUND INDICATED RESOURCE INCREASED 36% TO 1.0 MILLION OUNCES OF GOLD GRADING 5.2 G/T
* 2021 PRODUCTION EXPECTED TO BE BETWEEN 35,000 TO 45,000 OUNCES OF GOLD FROM MARTHA UNDERGROUND