Whoa, those are impressive grades, especially from historical workings.  I am quite familiar with the location in the Brandshaw Mountains and have done much hiking around there studying archeology and old mines.  Skipping further details, the mines here are usually small, but rich.  While not directly comparable to copper porphyry deposits like Hay Mountain, this bit of news and the other I just posted help to illustrate that some explorers are making progress without whimpering about disrupted travel plans.