Originally Posted by
Sharpielein
If you have only 1, then you must collapse all except for 1 deposit, which means you can't use any of the deposits except the one you want to refill.
Even if you use it on a Gold Mine, the 10% chance for 100 additional Gold Ore (=10 Gold Ore per search, on average!) coming at the price of not being able to use any of the other 5 deposits for lv3 gold mines comes at a price which is fairly unproportional to the benefits.
Plus, you'd not only be forced to collapse them once, but you will need to collapse them again and again after every search, which is quite tedious considering you're talking about 5 coins of value.
It may be a better suggestion to send off an Explorer to short treasure searches ... they rake in more profit, lol!