Mithril is gathered with Essencetapping at skill level 320 in AION Retail 5.8.

Gathering yields

Materials

Item	Chance
Mithril Ore	74.92%Share of this group’s roll that yields the item.
Greater Mithril Ore	20.00%Share of this group’s roll that yields the item.
Pure Mithril Ore	4.00%Share of this group’s roll that yields the item.
Euron's Memento	0.03%Share of this group’s roll that yields the item.
Mind Crystal	0.25%Share of this group’s roll that yields the item.
Brilliant Mithril Ore	0.80%Share of this group’s roll that yields the item.