Essence.

Weres all the entrances to the mines? All 3?

well
if your a member theres one at ardy
i cant remember the other members ones
also varrock rune shop

wizard tower south of draynor
cant remember last one

look at runehq.com

Varrock Rune Shop.
Ardougne Magic Fella.
Wizard Tower.
Magic Guild.

Don't forget the one at gnome stronghold