Regarding ore types and testing assuming you're referring to Met definitely recommend checking out ann 25th July 2023 if people haven't, where they conduct and report on "additional scaled up metallurgical test work via column leach tests".
To my knowledge this is fairly extensive testing, a step up from initial tests, and have heard Ian mention in interviews their resulting confidence in the recoveries from conducting such test work at such early stages, earlier than most juniors would.
A snippet below of recoveries of different grade ore, they also talk to crush sizes and more, worth a skim.
STN Price at posting:
28.0¢ Sentiment: Buy Disclosure: Not Held
A personalised tool to help users track selected stocks. Delivering real-time notifications on price updates, announcements, and performance stats on each to help make informed investment decisions.
(20min delay)