I have the expansion pack. I have mined in dungeons. I have mined on boats. I have 105 mining skill and over 400 luck. Hours later and several thousand ingots later.... not a single niter deposit to be found. Is there anything special you need to do, anything special you need to be mining for? Ore, ore and gems, ore and stone? When you hit a niter deposit, does it tell you that you've found one just as if you found a gem? This is really frustrating, especially on a shard with only one NPC selling saltpeter.