- Western Areas NL - Flying Fox Mine, Decline - WA, 2006
During decline development a flat water bearing structure was intersected 850 feet from surface making 18 Gal. / Second at 160 P.S.I. This aquifer was sealed in a single shift with no noticeable inflow after grouting. A second project was awarded to seal other areas of inflows elsewhere in the development.
- Newcrest Mining – Telfer Project – Ore pass – WA, 2006
Long holes were drilled into ore pass no.3 accessing a weak water bearing zone that leaked into the ore pass resulting in several dangerous ore hangs. All drilled holes were dye tested confirming connection to the leak.
- Gold fields - St Ives Gold Mine - Belleisle mine WA, 2007 & 2008
A single hole producing 24 Gal/Second at a pressure of 150 P.S.I. was intersected when an excavating tram broke through the rock face into a large aquifer. This sudden inflow resulted in a flash flood. Sovereign were summoned to seal the single leak and after 5 shifts all of the water was sealed. A second project was then awarded to reduce inflows elsewhere in the mine.
- Empire District Electric Company / BSC Holding Inc. /Sega Inc. CAES Bulkhead – KS, 2008
Compressed-air storage for energy use (CAES) has been used intermittently since the 19th century, but is finding new employment in the U.S. In 2009 an electric utility, BSC Holding, Inc. (mine owner),and Sega Inc., a design engineering firm, entered an agreement to investigate feasibility of storing wind energy as compressed air in the Lyons Salt Mine in Kansas. The test comprised isolating a cavern in the mine with a concrete bulkhead 25 ft wide, 17.5 ft high, and16 ft deep, embedded into the salt surroundings. The final seal was a flexible grout proprietary to and applied by Sovereign Group of Companies. A hydrostatic test with brine solution plus 20 cu ft of air was incrementally pressured to 50psi, then 100, 390, and finally 1,220 psi, with no measurable pressure drop inside. The bulkhead moved forward ¾ in. while pressing into the salt formation.
- Cargill - Avery Island Salt Mine, Underground Levels trial – LA, 2008
On site field testing was conducted during 2007 and 2008 in the 2-B slope on 500 level and T-27 on 700 level. After reviewing the photos and video clips of before and after grouting, it was clear that there was a major reduction in leaks. No erosion of the salt took place and the penetration was satisfactory even at low injection pressures. The coagulated grout remained flexible and did not wash out once solidified. Tests could not successfully be concluded in the T-27 site due to incorrect surveyed drilled holes - no dye reported in any of those leaks.
- Mosaic Potash Esterhazy K2 Plant, Underground Levels – Canada 2008, 2009, 2010
All grouting information restricted by Confidentiality Agreements.
- Xstrata Nickel Mine - Tapinos Ventilation Shaft / Rehabilitation – WA, 2008
Two areas needed grouting – making 4 Gal/Second hypersaline water: The seal of 80 feet concrete lined shaft – 330 feet from collar down to 410 feet. The second seal of 180 feet unlined shaft – 410 feet from collar down to 590 feet. A series of 18 feet long holes +/- 2inch dia. were fanned into the sidewalls of the fresh air intake shaft from the stage. This pattern was repeated but staggered every 12 feet down the shaft giving a three dimensional access to the water bearing area. All holes were dye tested to confirm connection. We were able to monitor direction of water flow but more importantly create our own flow pattern by manipulating flow through the multiport packer valves. Downstream holes were used for injecting activators – creating a deep seal. This was achieved by a build up of rubber lathes towards the upstream injection holes widening the spread of a solid rubber membrane in the formation.
- Barrick (Granny Smith) Pty Ltd – Wallaby Portal / VR2 Vent Shaft / Rehabilitation – WA, 2008
The VR2 shaft was leaking from a shallow aquifer underneath the collar. A ring of vertical drilled surface holes intersected the fractured ground around the vent shaft accessing the water bearing structure. Hypersaline water percolated from these fractures into the shaft. The injection of Sovereign’s grout into these surface drilled holes reduced the inflow by 96% with no disruption to the operation of the fan.
The Wallaby portal was leaking from underneath shot-crete rock support. Although the rock face was not visible to drill accurately, nuisance water was reduced by 60% after a short one day grouting programme.
- Xstrata Nickel Mine – Cosmos Deep Levels – WA, 2009
An inflow of 3 Gal/Second hypersaline water was entering this level in two locations - AMI Ore body and AMTA level at a pressure of 435 P.S.I. The fractured rock complicated the grouting process but longer holes ensured a deeper placement of the grout and all the veined inflows were subsequently sealed to satisfaction.
- Xstrata Nickel Mine – Tapinos Underground Levels – WA, 2009
Both areas were leaking 5 and 8 Gal/Second respectively with head pressure in excess of 500 P.S.I. All inflows in both areas were sealed off to satisfaction.
- AngloGold Ashanti – Sunrise Dam. Levels, Portal and Vent Shaft / Rehabilitation - WA, 2010
A large fractured surface area in this level was slowly percolating hypersaline water. Measurements were taken at the start of the project and measured at 6 Gal/ Second. After 13 days grouting the final water measurement was recorded at 0.5 Gal/Second. This resulted in additional grouting contracts, elsewhere underground.
- Lightning Nickel Mine – Moran Ventilation Shaft / Raise Bore – WA, 2010
Initial water inflow was 1Gal/Second. Short fanned holes were drilled to intersect the water bearing fissures. Dye tests were done to determine connections. Grouting commenced after a positive connection to the water flows was established. Multiport packers were inserted into the drilled holes. The leak area down the shaft, from 110 feet below shaft collar, down to 322 feet was to be sealed. The shaft inspection after grouting revealed the NOH2O grout injected into the water body travelled from 322 feet down to 720 feet through the structure – more than 390 feet, demonstrating how penetrable NOH2O grout is. A 93% reduction in inflow was achieved.
- Xstrata Nickel Mine – Prospero Ventilation Shaft / Raise Bore – WA, 2010
1 Gal/Second water was leaking into the shaft from compound fractures in the shaft wall between 260 and 600 feet below ground. This resulted in the exhaust fans emitting a hypersaline spray, impacting on the environment. The mine owners engaged Sovereign to seal this water inflow - a decision was made to grout from the surface through 9 surface bores, 20 feet away from the shaft collar. The twin fans were never turned off and no shaft inspection was done to confirm whether all the aquifers were intersected by surface drilling. The grouting resulted in a 76% reduction of inflow.
- CBH Group – Tunnels, Silos sites throughout – WA Australia 2006, 2007, 2008, 2009, 2010
Several underground silos, tunnels, cells, hoppers and pits successfully sealed since 2006.