The simplest valuation

Many here will be familiar with precious-metals mining investor Eric Sprott.
Here is a quote from the Jan 17th, 2020 Sprott Money Talk when gold was US $1,559

Eric Sprott: “ I have this metric that I use that every hundred thousand ounces of production should give you a market cap of about $400 million. Not Canadian, I'm talking US when I say $400 million per 100,000 ounces. And, of course, that's going to hold even more with the price of gold going up. I probably should be using a higher metric now.”

While this is clearly a over-simplified approach as it doesn’t take production cost etc into account, I like it.
Now, WAF's market cap is ca. A$880 million, or US $615 million. In Sprott's metric (and at a US $1,559 gold price) , this would be appropriate for an annual production of ca. 150 koz (or 120-130 koz at present higher gold prices).
WAF is on its way to produce 300+ koz in its first year. So, WAF is undervalued by, erm, where's me calculator...