The Salt Mine was a neutral location found in older versions of Mount&Blade. It was first added in Warrider (version 0.202), and removed in version 0.894. It can still be found in the game files of even the latest version of Warband, and can be activated via editing. The mine makes a comeback in Viking Conquest and several mods.
Overview[]
In the core Mount&Blade games, the Salt Mine was a place where the player could either buy salt and ask about places where it was best to sell or buy certain goods; hire low-level troops such as peasants (in some versions); or could sell off their prisoners (a feature present since Warrider). The location had two NPCs - Barezan and Galeas - who offered the aforementioned services.
In Viking Conquest, the Salt Mine can be of use to a player for several reasons. For one, they can earn an "honest" living by mining salt. The overseer will give the player a pickaxe that they can use to mine the salt, and are granted payment upon mining enough. The player is also able to purchase salt from the mine directly instead of searching for it in towns. Additionally, the player can sell prisoners to the overseer, though earning only 15 penings regardless of the prisoners' normal value.