This underground mine, which is 1,100 feet below the surface, mined into a core hole taken from the surface. The core hole was dumping significant amounts of ground water into the mine. To stop the water inflow, a high-pressure probe and polyurethane grout was implemented. Grouting contractor Sub-Technical, Inc. used their specially designed probe to insert into the core hole. The probe contains a port where polyurethane can then be injected to permanently seal it off. The polyurethane used was SealGuard II, which is manufactured by SealGuard, Inc. SealGuard II (also called H2O Stop) is a dual component polyurethane grout that reacts in about 3 seconds to produce a rigid foam. The cured foam has a 900-psi compression strength.
