Mount Isa is a city in North-West Queensland, Australia. It came into existence because the area holds vast mineral deposits. Mount Isa Mines is arguably the most productive single mine in world history – based on combined production of lead, silver, copper and zinc. MIM is one of the largest producers of zinc, lead and silver and holds one of the world's largest underground mines. With a population nearing 25,000 in the city and 35,000 in the district, Mount Isa is a significant administrative, commercial and industrial centre for the state's vast north-western region. Although situated in an arid area, the artificial Lake Moondarra to the north provides both drinking water and an area for watersports, birdwatching and recreation.