Ann: QUARTERLY ACTIVITIES REPORT - SEPTEMBER QUARTER 2017, page-11

johnrap, best to read the AIS announcements late 2015. There are CRPS 560,463,653 and CNRPS 140,115,913. There is also a 5% payment if Cu price goes above $8000/t, and more at $8750/t and $9500/t.
To redeem all the notes is something like $50 million, and have until 31st DEc 2019.
The CNRPS and CRPS convert automatically on the 31st Dec 2020, its possible for another shareholder to buy like Glencore, or a SPP could also be utilized. But the CRPS and CNRPS can be converted earlier if the shareprice is high enough for the holder to want to exercise them.

http://www.asx.com.au/asxpdf/20150803/pdf/4307vg0md5h6p4.pdf