RE: Napkin Math never say never but i guess "economically viable" is not really debatable.
not just the drilling has been very good so far but also there are very low impurities.
bellzone forécariah got just 240m tons defined at the moment and they built the mine just on internal studies back then. and even with their 58% product they will make hefty profits once they will manage the typical hiccups of a junior miner.
that's why i am really bullish since the interest by cif.
they wouldn't pour 10-30 million into wai if they wouldn't have seen what is there.
wai is aiming a 62% product at wondima and if they can prove just some additional dso at sambalama (that is more difficult to drill as vanguard said) the initial capex would be extremly low since there is almost no need for additional infrastructure.
page 9/10:
https://www.bellzone.com/images/downloads/Investor-Update-July-2012.pdf