Mining

Mining is a gathering skill in OldSchool RuneScape. It is closely tied to artisan skill smithing and also to crafting.

Pickaxes
All pickaxes excluding the black pickaxe can be bought from Nurmof's Pickaxe Shop in Dwarven Mine. Since it's a members' Treasure Trail reward it means regular F2P players can buy the black pickaxe from other players or from the Grand Exchange.

Mining Guild
Mining Guild is a special mining site and part of a bigger network of Dwarven Mine in the Kingdom of Asgarnia. Player needs level 60 mining to enter the guild.

Drinking Dwarven stout increases players mining level by 1, thus making it possible to enter the guild at level 59.

Rune Essence
The Rune Essence mine is unlocked in the quest Rune Mysteries. Accessing it requires talking to Aubury in Varrock or the head wizard in the basement of Wizards' Tower.

Blurite mine
During The Knight's Sword the player discovers a mine of blurite rocks in the Asgarnian Ice dungeon. The untradeable blurite ores serve no purpose after the quest but they can be mined for experience.