Only one whole was drilled in Alaska because the company's plan were shut down by an early winter storm, thus ending the drilling season. That took the comany to the point that they were forced to sell the claim to Northern Dynasty to settle a debt that was coming due. Otherwise, the program would not have ended with one hole.
Also, one hole at Hay Mountain, or anywhere else would not be cost effective. Once equipment and personnel are in place, multiple holes are not that much more expensive. Besides, the chances of a complete missing of economic ore are large with one hole, and the deeper the target, the larger the risk of missing it. You could be left with only enticing geochemical clues, if anything.
This option is dangerous too because partners and shareholders will flee on one bad hole, when, if ore grade material exists at all, other holes could avert such disaster - could, not will.
VP