In the absence of info as to the grade of sections of the wider interval, with high grade samples and veins being indicated, and with the company's admission that the background veinlets do not run well, I am betting that there are one or two richer veins that contributed to 80% of the gold, leaving the rest of the formation very low grade (sub one half gram). If 18 feet ran 60 grams and the 460 other feet ran 0.5 grams, then the whole thing would run about 3 grams.
Of course 18 feet of 60 grams is very good, but they probably did not want to find that.
In geology you bet the negative, not the positive, unless proven otherwise. You drill at the bet, but don't bet on what you cannot know.
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