There are likely thousands of mines and excavation sites in the West, Utah alone has been dug pretty good over the years in search of stuff to pawn in Vegas.
The story of Daddy taking a late night camping trip in the middle of the night in a snow storm with a 2 and 4 year old so mommy could rest is a wee bit weak to many.. but until we find remains,, DNA or jewelry, The question of what happened to Susan Powell will remain unanswered.
My guess is that daddy returned to the scene of the crime....and/or a camper found something.....OR....they're trying to get him to make a wrong move....and there are no remains.