In order to mine this ore, you will need a mining skill of at least 230. Dark Iron ore can be a great bridge between Mithril and small Thorium Veins, which sit at 175 and 245 respectively. One downside is that, this ore only spawns in two zones: Searing Gorge and Burning Steppes.
Tin Ore farming guide for Classic WoW
Tin Ore is used to make Bronze, which is used by Engineers to create their tools & gadgets. It is mostly farmed by people who are leveling mining, so the price can vary a bit. Here is an overview…