Project: Kylylahti decline tunnel

Schedule: 2010–2016

Customer: Kylylahti Copper Oy, Boliden Kylylahti Oy

Location: Polvijärvi

The Kylylahti mine is located in Polvijärvi in Eastern Finland. The mine produces copper, cobalt, nickel, zinc and gold. Throughout the Kylylahti mine’s operating period, YIT has been responsible for slope tunnel excavation at the mine. We excavated a total of 5.6 kilometres of decline tunnel to a depth of 800 metres and also 6.3 kilometres of horizontal tunnels.