I also have problems with the mine, the game seems to take any of the more expensive minerals i get out of it, gold, ruby and sometime silver, if it is coupled either of the first two. Since i got the mine have only been able to claim 2 gold, first strike and this last strike. All the other gold and rubies so far have been disappeared just when it is time to claim them, then the game freezes and shuts off. When i get back on, no minerals in my barn and the tools i just used still gone (so not much of a reset then, since nothing is replaced to it's original state). The game does not freeze at the claim stage whenever it is Iron though.
I was advised to shut down the game and then go back into it, for hopefully a reset and replacement of my stuff, but alas that does not work.