Iron ore

Ironman verdict

At least 8 monsters drop it, and the best one is also the easiest: Cave goblin miner (level 7), at 20/128 (about 1.1 per kill). You can also make it yourself: it takes 15 Divination and gives 3.7 Divination XP, using 2 × Flickering energy and 5 × Copper ore. There is one other recipe below. Other sources include Dwarf, Ava's accumulator, Ava's alerter and Thalassus, plus 4 more listed below. Making ten takes 20 × Flickering energy and 50 × Copper ore and gives 37 Divination XP. Reaching level 15 Divination takes 2,411 XP in total; the Divination calculator counts the actions and materials to any target, and the Divination guide has the Ironman training route. 6 recipes use Iron ore, including Coal, Granite crab pouch and Inferior locator. Iron ore is available on free-to-play worlds too. It is tradeable on normal accounts, but an Ironman cannot use the Grand Exchange or trade for it, so the sources on this page are the whole list. High Alchemy turns one into 15 coins, which is 10 less than the shop price, so buying it to alch does not pay.