In junior mining, deals with scams happen ALL THE TIME. It isn't about the property, but how it is promoted and presented.
In Argonaut's case, they did drill. The results were AWFUL. But Mexus presented the results as AWESOME by lying. IIRC, they eliminated the bad data from the results they presented to the public and instead insinuated (at best) that the intersections were continuous, higher grade and lengthy rather than short, widely scattered and low-grade.
That is what scams do. And that is what Mexus did.