The PFS also fills in the economic inputs: average “all-in sustaining costs” (AISC) of AU$3,293 per ounce (a mining industry yardstick for ongoing operating costs), about 93% expected metal recovery, and roughly AU$98 million of total project capital to build and run the operation. Investors will likely compare those assumptions with the wider Edna May resource base, which the company says totals 945,000 ounces, to judge how much upside could later be converted into reserves.
Why should I care?
For markets: Edna May’s margin matters more than the AU$728.7 million headline.
At the PFS inputs, Edna May’s basic economics are straightforward: AU$5,500 gold minus AU$3,293 AISC leaves about AU$2,207 per ounce before taxes and discounting. Multiply that by roughly 402,800 reserve ounces and you can see where big free-cash-flow numbers come from.
But that also explains the risk. With around AU$98 million spent largely upfront, small moves in the Australian-dollar gold price can change payback timelines and how the market values the project, because costs usually don’t move in lockstep with the metal price. So markets tend to focus on the implied per-ounce “headroom” and how sensitive it is, rather than treating a long-dated, pre-tax total as a sure thing.