There are two entry points into the mine; one from the southern end of the Dwarven Mine, the other by a set of ladders just south of Falador east bank, surrounded by buildings. There are several dwarves located at each entrance, but at the top of the ladders, there is a dwarf wearing a mining skillcape. You can purchase a mining skillcape from him for 99,000 GP if you achieve level 99 mining.
 The Mine
The mine itself contains the largest collection of Coal rocks in all of RuneScape, a total of 37, and because it lies just a short walk from Falador's eastern bank, it is a popular location for Coal miners. The mine also contains five Mithril rocks in the south-eastern corner.
Mining Courtesy: One of the unspoken (and generally followed) rules of the Mining Guild is to not start mining a Coal rock that another player is already mining. However, the five Mithril rocks are always in high demand so the rule doesn't usually apply to them.