I don't have the background to compare the levels to groundwater in other locations. I'll have to see data from additional water and till samples. If there were to be a rich natural vein of gold, there's no way for them to mine it; CCH would immediately take control. It's likely that if a gold chalice comes up in a hammer grab that they would stop and excavate a larger dig in an archeologically friendly way.
Here's a preview of Billy Gerhardt's truck full of silver being hoisted up from the bottom of the money pit.
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