The Belleisle decline’s portal is situated at the bottom of an open pit in the middle of a saltpan, Lake Lefroy – 50 Km south of Kalgoorlie, Western Australia. The paleo–channel at the top of the Belleisle Shear Zone is the source of brine water leaking down between two impermeable porphyry contacts. The sheared rock in between these lenses was intersected during mining development and a large rock burst out due to hydraulic fracturing, opening a 90 litre per second / 12 bar water leak (21 US Gallon per second / 174 P.S.I).
The result of this intersection was serious flood risk due to the unexpected high pumping load. Conventional grouts were not considered due to the high flow rate and brine content of the water. Sovereign Hydroseal was called in and after some dye tests a short drilling program was initiated, accessing the shear zone.
Sovereign’s own patented emulsion grouts, the NOH2O, are hydrocolloid and although miscible, do not form a true solution so they will not continue to disperse during application. Besides, these emulsion grouts have a particle size of 0.6 nanometre which makes them extremely penetrable.
Sovereign used 12 tons of these special water proofing emulsion grouts, NOH2O to plug the single leak in the Belleisle mine. The site was handed back to the mine management within 4 days of intensive grouting.
Sovereign returned to the mine in 2008 to help with the development through the shear zone on other levels, sealing water.