here's how it looks when you go to mine:
https://i42.tinypic.com/25zq92v.png https://i41.tinypic.com/jujtyq.png https://i42.tinypic.com/332pc8w.png https://i39.tinypic.com/2ak0f8x.png
then you get several chances to dig, and you can see approximately how many digs you have left according to the blue progress bar.
i forgot to take a picture of the end result, but you'll see the type of rock you find. the areas that you dig will remain on the board as holes or whatever you found, so when you continue to another spot, you won't dig the exact same spots. on my 1st try, i dug up one gold and one iron. there is also silver... not sure what else.