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 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.