JW;
Yes, he hit the nail square on the head. Prove up the overburden leading up to the edge of the anomoly, so you can determine if an open pit mine is feasible.
That way the miner gets paid to remove all the excess dirt and rock on top of and around the anomoly. Once he gets to the anomoly---mining it should become 100s of times more profitable, and the cost of removing the overburden was not just pure expense.
Great observations on your part by the way, and good questions to prompt a response from those who may know. That is why this hub is so great---a real learning site. As the saying goes,ten heads are always better than one. I also think you know a bit more than you are letting on. Good on ya. Pleasure talkin to you and the rest of the posters and readers.
Rinky