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

A Mithril pickaxe requires level 21 Mining to use and can be bought for 1,300 gp from Nurmof in the Dwarven mines. It is the third best pickaxe available in RuneScape Classic. Mining with it is the equivalent of clicking a rock 5 times with a bronze pickaxe.