Seems that crime was the norm in some places. Many deceptions occured when a mine was put up for sale. One that springs to mind was, i think, Klondike lead mine. When offered for sale it was advertised as a silver mine and the appropriate ore and items left lying around to complete the deception.
Wasn't there a quarry at Corris sold to someone where a few tunnels had been dug but no slate ever taken?