If it's in a spot close to water bucket water into the whole and let it soak.
or cover it up and wait for fall rains to soften the ground.
Or put on your big guy panties, get a bigger shovel and dig that thing out.
Inquiring minds want to know!!
Never walk away from a signal, it will haunt you later on. In all the time I have been digging I have only walked away from two signals and I regret it. Will never know what they were.
Just curious. How far did your wife have to travel to bring you a pick axe? Mine would be willing to go approximately 100 yards to bring me one. Any further and I would be on my own.