Aug 29 (Reuters) - Sheffield Resources Ltd SFX.AX :
* SECURES ADDITIONAL BINDING OFFTAKE VOLUME (AGREEMENT) FOR FUTURE SALE OF PREMIUM ZIRCON FROM THUNDERBIRD MINERAL SANDS PROJECT
* AGREEMENT FOR A 25% INCREASE IN ANNUAL SUPPLY OF FURTHER 1,000 T OF PREMIUM ZIRCON IN ADDITION TO AGREEMENT DONE EARLIER