Siilinjärvi carbonatite
The Siilinjärvi carbonatite complex is in Central Finland near to Kuopio. It is named after the village it is next to, Siilinjärvi. It is a carbonatite mine. The complex is about 16 kilometres (9.9 mi) long. The place was discovered in 1950 by the Geological Survey of Finland. They began mining it in 1958. It is the second-largest carbonatite complex in Finland. The Sokli mine is the biggest.[1][2]