Ann: Announces Q2 2017 Operating and Financial Results, page-8

This project is different to typical Australian projects which only get off the ground with minimum reserves for financing. Alacer already had the 20 years of reserves defined at the time of the technical report and this is unlikely to change much as I understand it. The mined grade drops off substantially post 2023 and that is the controlling factor on ounces produced. Maybe they have some inferred resources at a higher grade, I haven't checked.