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'Kelmis' (in French: 'La Calamine') is a municipality located in the Belgian province of Liège. On January 1 2006 Kelmis had a total population of 10,396. The total area is 18.12 km² which gives a population density of 574 inhabitants per km².
The territory around the Vieille Montagne zinc mine in Kelmis was semi-independent during 1816-1919 as 'Neutral Moresnet'.

In the nineteenth century a Low Franconian dialect was spoken in Kelmis.