Adamantite ore

Adamant ore is a type of ore that can be mined in various places throughout RuneScape. It can be smelted with six pieces of coal to form an adamant bar, which can then be smithed into various types of weapons and armour.

Adamant ore can be mined with a mining level of 70 or higher and gives 95 mining experience. Adamant rocks can be found in the Hobgoblin Mine, Dwarven Mine, Lumbridge Swamp mine, and a few other places.

The Hobgoblin Mine has the most adamant rocks, but it is far from a bank, filled with aggressive Hobgoblins, and dangerous since it is in the wilderness. Though, with the "Canoe" update, the mine has become more convient, and more popular to use in members. The next best way to mine adamant ore would be to go to one of the other mines and switch worlds as you mine the rocks.

Trivia
S H A R K was the first player to be able to mine adamantite.