Mithril means much to the dwarves. It was first discovered by a dwarf called Tolkun in the First Age, and its seams have been uncovered in much of Gielinor. The dwarves call it 'The Dwarven Welcome' thanks to its shine. Find the ore when mining and it lights up to greet you: a dwarven welcome.
A 'Dwarven Welcome' is also what dwarves call a headbutt while wearing a mithril helmet.