095 script request.

[Poi]

Hey i was wondering if someone could make me a script or lead me in the direction of the making of a script that takes an item and when someone uses it(special pickaxe) they get a higher % of finding specific ores..
Oh, after thinking i was thinking... its not on a percent basis, its on a location bassis,s so i was thinking, could we make it so it syas the same stuff, you can only use it on "ore" carrieng places(caves, rocks etc) but it randomly creates specified ores..?