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Tunnel boring machine breaks through in Kemano hydropower project milestone

A tunneling project that began in the early 1990s reached a major milestone for Rio Tinto’s Kemano T2 hydropower project in British Columbia, Canada when the Herrenknecht tunnel boring machine (TBM) broke through to complete its journey. The Kemano T2 Project completed a second tunnel to carry water into the Kemano Powerhouse, to ensure the long-term reliability of the power supply for Rio Tinto’s BC Works smelter in Kitimat. The TBM cut 7.6 km (4.6 miles) through the rock in remote mountains over 30 months, completing the route for a 16 km (10 mile) tunnel that was started in the early 1990s. “This is a significant milestone toward finishing the second tunnel and securing the long term reliability of hydropower for Rio Tinto’s smelter in Kitimat, which produces some of the world’s lowest ...

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