here. Icon lamps also burn in an Orthodox chapel set on the mountainside. The discovery in 1966 of the Oktyabrskoye deposit of copper-nickel ores, located 40 kilometers northeast of Norilsk, was a milestone in the further development of the region. The mining settlement of Talnakh was founded at the same time. A new complex, the Nadezhda Metallurgical Plant, was built 15 km west of Norilsk to process the raw materials from the new deposits. Work began in 1971 and the complex was finished in 1981. A number of Finnish companies assisted in the construction and automation of Norilsk's No. 2 copper and nickel smelters (in the Nadezhda complex), which led to substantial numbers of Finnish metallurgical and automation experts and their families coming to Norilsk from 1978 onward, creating a Finnish expat community of some hundreds of people for a couple of years. Today Talnakh is the area's major mining/enrichment site. Enriched ore emulsion is pumped from here to Norilsk's metallurgy plants. Enriched nickel and copper are transported from Dudinka to Murmansk by sea, and from there to the Monchegorsk enrichment and smelting plant on the Kola Peninsula, while more precious content goes upriver to Krasnoyarsk. This transportation takes place only during the summer. The port of Dudinka is closed and dismantled during spring flooding in late May, when waters can rise by up to (a typical spring occurrence on all Siberian rivers, caused by winter ice obstructing meltwater from upstream). Norilsk-Talnakh continues to be a dangerous mine to work in. According to the mining company, there were 2.4 accidents per 1,000 workers in 2005. In 2017, Norilsk Nickel claimed that it had reduced its overall lost time injury frequency rate (LTIFR) by almost 60% since 2013. In June 2020, 20,000 tons of diesel fuel spilled from the tank of an NTEK power plant, polluting hundreds of square kilometers and causing serious damage to the local ecosystem. Norilsk remains a closed city, and foreign citizens require special permission to visit the area. Administrative and municipal status Within the Russian system of administrative divisions, it is, together with the urban-type settlement of Snezhnogorsk, Krasnoyarsk Territory, incorporated as the district city of Norilsk—an administrative unit with a status equal to that of the districts. As a municipal division, the district city of Norilsk is incorporated as the Norilsk Urban Okrug. Since 2005, the city of Norilsk has been divided into three geographically