mining-technology.com link
Not sure if this has been mentioned from last month, and I'd almost totally forgotten about the Zinc CFE may have had as the last announcements had only spoken about Cobalt and Copper. This article from 21 May states that Kipushi has potentially 381,000 tonnes of Zinc over 11 years of production. With prices at around US$3000 a tonne, thats quite a significant billion dollar plus to the bottom line. Could also be that the article is a typo, as Sage is never quoted as saying it himself.
Anyway, bring on the PFS!