In order to mine rune essence you NEED to complete the "Rune Mysteries" quest.Then go to either the Wizard Tower or the Varrock.If your going to the Wizard Tower go down 1 level and talk to Sedridor and tell him to teleport to the rune essence place or for Varrock talk to Aubury (Varrock rune shop).
There is no best, all pure essence is the same from every mine.
Advanced runes (basically, the runes that can only be made by members) can only be made from pure essence.
You can check by looking at your mining skill guide.
To make 100k in Runescape mine around 1000 Pure Essence ( Members ) or around 3000 Rune Essence ( Non Members )
Chaos alters let you make chaos runes assuming you have rune essense in your inventory and you actually are in the alter
In order to get pure defence in Runescape, you kill monsters using defence stance accessed in the combat style thing. That is how you get pure defence in Runescape.
To mine pure essence you need to be a paying member, which opens up a lot of cool stuff, and then you need level 30 mining to mine it. you would have to do the "Rune Mysteries Quest" and you need to have a member account along with a minimum of lvl 30 mining....--the 3rd ark--
A Strength And Mage pure.
Mine from a rune essence mine. you would have to do the "Rune Mysteries Quest" and you need to have a member account along with a minimum of lvl 30 mining....after you get those things done just go to the same place to get reg. ess and mine the same thing but this time u will have pure ess--the 3rd ark--
You need level 30 mining to mine Coal in Runescape.
There is a mine that is southwest of Al Kharid. You can mine it there
A str/Mage pure.