huge tunnel mining machine

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  • Chile's huge open-pit copper mine goes underground - Yahoo

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  • Tunnel boring machine - Wikipedia

    A tunnel boring machine ... Tunnel boring machines are used as an alternative to drilling and blasting (D&B) methods in rock and conventional "hand mining" in soil.

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  • Mining & Minerals Extraction - Apps on Google Play

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    The first phase of the Clean Rivers Project to control combined sewer overflows to the Anacostia River is nearly complete. Nannie, the tunnel boring machine named after the famous District educator, Nannie Helen Burroughs, finished the construction of the 2.4 mile long Anacostia River Tunnel in November 2016.

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  • Bertha (tunnel boring machine) - Wikipedia

    Bertha was designed and manufactured by Hitachi Zosen Sakai Works of Osaka, Japan, and is the world's largest earth pressure balance tunnel boring machine, at a cutterhead diameter of 57.5 feet (17.5 m) across.

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  • Seattle's Big Tunneling Machine Is Back on Track

    We've covered the saga of the SR99 tunneling machine, better known as Bertha, since it broke down after only drilling though just 52 feet in three days of operation. Now the Seattle tunnel boring machine is finally back on track. It just broken through an access repair tunnel and has since mined 73 ...

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  • Alaskan Way Viaduct - Follow Bertha

    Follow Bertha Thank you for following Bertha. The SR 99 tunneling machine, nicknamed Bertha, has completed her work. For the latest tunnel progress, visit our new tracker page.

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