I know that regular cobble stone has been added to the moss cobble stone to prevent some people that were x-raying, but if we really are going to implement this into our mines then we need to do it effectively. I propose that we add some extra rock to each mine if we are going to go through with doing it to one (i.e. for members they will have stone and cobble stone blocks and maybe for people of alpha they have stone and brick blocks). This would help prevent the use of x-rays and allow people to still collect money successfully. Although we need to ensure that adding these materials into mines does not affect the profit that you would normally get since our only goal is to stop x-raying not slow down profit. I suggest adding a higher priced sell option to shops of a higher rank (i.e. for members you sell cobble at .5 since that is its rate, but a beta can sell cobble in the beta shop for 2 since this would not take away from the profit per pick).
All in all I will sum up my suggestions into a few bullets
1. Either add an item to all mines or take the cobblestone out of the moss stone mine
2. If we do decide to add these blocks to every mine they need to not take away from the profit, therefore we need shops that sell items for more at higher ranks