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PROJECTS - TUNNELING
Sovereign has successfully sealed more than 200 underground mine sites the past 45 years across 5 continents.
Tunnels sealed – Curtain and Reactive grouting of excavations during tunnel construction.
Tunnel maintenance: water proofing contracts.
Some projects undertaken by SOVEREIGN using our patented products and technology include:

Pretoria Portland Cement - Underground Tunnel. Transvaal, RSA. 1978

Odendaalsrust Grain Silos - Intake hoppers and tunnels. Orange Free State, RSA

Holzman - Franki JV - Outfall tunnel, Stone Cutters Island, Hong Kong. 1998 5 shifts only, sealed 95.3%. Manager - N A Hodge.

Thames Water Board, Dartford Tunnel - East. London UK 1992.

Gwithian Outfall Shaft - Sewerage tunnel. Penzance, Cornwall (Cementation Mining Ltd UK JV), UK.

Hazelbrook Main Sewer Tunnel - (Costain Contractor Public Works Dept) NSW Australia

Prospect Water Tunnel Costain Resources NSW Australia

Transfield / Kumagai JV - Port Hedland Harbour TBM Tunnel for BHP 1997.

CBH Group Co-operative Bulk Handling Ltd – Grain Silos – Numerous underground silos, tunnels, cells, hoppers and pits successfully sealed since 2007 throughout Western Australia.

Metropolitan Transport Authority / Granite–Traylor–Frontier JV – Queens Tunnels New York City – Grouting TBM excavation – New York, USA 2011

Shiavone / Kiewit JV. Queens Open cut Excavation Q-Tip – Northern Blvd, Queens - New York. USA 2011.

Perth City Rail Link – Sheet pile / sand - floor leak 6L/sec. John Holland WA, Australia 2012/13.

Bokomo Silo and tunnel sealed – Gaborone, Botswana 2013

Perth City Rail Link – D-wall and floor joints sealed – John Holland Perth WA Australia 2013/14

Steinway Tunnel C1 and C2 tubes sealed. J-Track /NYCT Queens - New York, USA 2013/14.

Montague Tunnel R1 & R2, B1 & B2 tubes sealed. J-Track /NYCT Manhattan - New York, USA 2014

MTA - New York City, Hudson Yards 34th Street Station Leak Remediation 2016