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Sirius Minerals Plc. has hired the European construction group Strabag to build a 13 km tunnel section for the underground transport system for the Woodsmith Mine near Whitby, England. The design-and-build contract was signed on 28 March. The Woodsmith Mine will begin extraction from the world’s largest deposit of polyhalite, a mineral used in the production of fertilizer, in 2021.

The section to be built by STRABAG is part of a 37 km tunnel with a diameter of 4.7 m for an environmentally friendly conveyor system to transport the mined polyhalite to Wilton for processing. The Strabag contract also includes the construction of a tunnel ramp as well as the tunnel portal at Wilton. The actual tunnelling works will cover the distance from the Wilton portal to a shaft at Lockwood Beck, with 150 m to be built via cut-and-cover construction, 800 m through conventional tunnelling and 11,900 m using a tunnel boring machine. Site mobilisation is to begin immediately.  Visit http://www.strabag.com. 13/18.



Sirius has varied its existing mineral transport system (MTS) tunnelling contract with Strabag to include engineering, procurement and construction of the conveyor system, the maintenance railway, electrical and communications infrastructure. The MTS fit-out scope includes the fit-out of; the MTS conveyor, the maintenance railway, electrical and communications infrastructure, and all other services in the tunnel essential to the operation of the MTS.

Mineral transport system

The MTS will carry the Company's mined polyhalite from 360 meters underground at the Woodsmith mine site to the materials handling facility at Wilton, Teesside, on a 37km underground conveyor system.  The tunnel will be constructed by three tunnel boring machines.  The conveyor system in the MTS will be designed to handle 20 Mtpa of throughput.  The tunnel will also contain maintenance rail and services, including a 66kV power feeder from Wilton International industrial complex.

Portal construction at Wilton for the first TBM remains on track for completion in 2018 with TBM delivery expected early 2019. 

For further information click here and for tunnelbuilder archive click uk/97. Visit https://siriusminerals.com. 46/18.

For further information, please contact:

Sirius Minerals Plc

Investor Relations

Jennifer Wyllie, Tristan Pottas

Email: ir@siriusminerals.com

Tel: +44 845 524 0247

Media enquiries


Alex Simmons, Ed Brown

Email: Siriusminerals@edelman.com