RuneScape Classic Wiki
RuneScape Classic Wiki
The Old School RuneScape Wiki also has an article on Mithril ore.
The main RuneScape Wiki has an article on: Mithril ore

Mithril ore is an item which may be obtained by players with level 55 or higher in the mining skill from a mithril rock. It is smelted with 4 coal to create a mithril bar, which may be used in the smithing skill to produce various types of mithril equipment.

For a list of mithril rock locations, see mithril rock locations.

Dropped by

Monster Combat level Quantity Rarity
Ice Giant 68 1 4Rare
Ice Warrior 57 1 4Rare