The Blue Mountains miner is a Dwarven trader that dwells underground in the caves of the Blue Mountains biome. They are similar to Dwarf miners, and can occasionally be found in Blue Dwarven mines. Also, one may stumble upon a group of them wandering a cave, along with some Blue Mountains Dwarves. They actually have a larger chance to spawn in a well lit area deep underground. If you want to meet one of them dig 7 x 7 x 4 hole at about level 10. A Dwarf miner will spawn there eventually.