...don't know about Zambia, but ND's potential partner is First Quantum Minerals.

https://northerndynastyminerals.com/news/news-releases/2017/

And as to Arizona Mining, yes, they are known to have one of the largest, richest deposits of it's type ever found.  As this news is just now getting around, it will bring added attention to Southern Arizona.  It doesn't hurt that those behind Arizona Mining are the same folks who found, explored, and sold the Rosemont mine to Hudbay.  Rosemont will be a significant supplier of copper in the world market, so two huge winners for this region (by the same investors) in a short span of time has to be good news for Hay Mountain as well.