The drilling at TC started earlier this month and they've already sent a core for assay according to Eric Spott(15 minute mark) : https://soundcloud.com/sprottmoney/sprott-money-news-weekly-wrap-up-52920 

While you can't estimate assay by looking at core as indicated by Sprott, you can see if metallic mineralization is present, does it look like the previous cores assayed and what length is involved. In other words you do get a heads up for this type of target as soon as you pull core. TUD shares are already on the move and I expect AMK will follow. Should be interesting over the next 2 months.