I keep seeing these estimates of the gold asset's value at...

I keep seeing these estimates of the gold asset's value at millions of dollars. Can anyone tell me where that's coming from? Genuinely interested in knowing the source of that valuation.
Personally I'm worried about how much cash the company has already spent trying to hang on to a legacy "asset" that barely rates a mention in most analysis of the company I've seen. The awarding of costs against CIO is bad news. Throwing more money after this by fighting on sounds to me like throwing good money after bad. Lawyers aren't cheap. This is not the company's chief business these days. Time to move on.