Ann: FY 21 Gold Production and Cost Guidance, page-21

A crude look at the gold reserves of MML seems weak to me. (3 years approx).
Have a look at the info below... can someone tell me if there is more potential reserves looking further forward?
Thanks in advance.
NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS for the year ended 30 June 2020 (SEE PAGE 51 OF REPORT)
. IMPAIRMENT OF NON-CURRENT ASSETS (continued) a)Impairment testing (continued)ii) Key Assumptions
The table below summarises the key assumptions used in the 30 June 2020 carrying value assessments.
Comparison to the prior period has been provided.
AssumptionsUnit2020(2021 -2024)2019(2020 -2024)Average gold priceUS$/ounce1,6431,347Average AISCUS$/ounce1,2031,049Pre-Tax discount rate (%)%14.017.3
Probable reserves ounces 332,000
Production capacity per annum ounces77,000-98,000 98,000 -105,000