Vieille Montagne (French pronunciation: [vjɛj mɔ̃taɲ]) was a zinc mine in Kelmis (La Calamine), a town in Belgium between Liège and Aachen. The mine's name is French for "old mountain" or "old mine", and this is also reflected in its German name, Altenberg (earlier, Alten Galmei-Berg).[1] The mine was once a bone of contention between Prussia on the one side and the United Kingdom of the Netherlands (later Belgium) on the other, that resulted in a piece of land that became the territory of Neutral Moresnet.