Gives a chance of a Treasure bonus quest. A bonus quest that rewards Granite, Saltpeter or Titanium Ore, if found with the Long or Very Long Treasure Search.
So the kinds of quests you can expect to get are:
-Find Granite on a treasure search Reward: 10 granite
-Find Saltpeter on a treasure search Reward: 5 saltpeter
-Find Titanium Ore on a treasure search Reward: 3 titanium ore
This skill only seems useful if you are going to do a lot of long and very long treasure searches, then you can get a little bit of extra treasure.