Nan Nan Resources Enterprise (HKG:1229) entered into a sixth deed of amendment to further extend the maturity of its HK$200 million zero-coupon convertible bond by 36 months to March 13, 2029, according to a Tuesday Hong Kong bourse filing.

The amendment also extends the conversion period to the same date and introduces a partial redemption right, allowing the company to redeem up to HK$40 million of the outstanding principal prior to maturity.

All other terms of the convertible bond remain unchanged.

Nan Nan Resources said the extension will allow it to retain working capital for its operations, including the expanded Kaiyuan coal mine.