"The recent investments by all directors that already hold...

"The recent investments by all directors that already hold plenty of stock, most likely provides a solid indication that the deposit is pure"

This sentence insinuates that the directors have bought shares based on data not released and unavailable to the public - just because the reported levels of Fe are low, does not make the deposit clean!

a simple flow sheet diagram is not a substitute for mineralogical TIMA and XRPD analyses
the most likely explanation is that the flow sheet diagram was created prior to any detailed mineralogical analyses

the absence of evidence is not evidence of absence