Since formulating its first grout in 1972 for high-flow, high-pressure water ingress in South African deep mines, Sovereign Mining has specialized in manufacturing and applying patented polymer grouts that seal water in subsurface environments. The privately held company’s NOH2O® penetrating grout is injected into water-bearing rock and is designed to remain flexible through normal construction and ground movement, with projects ranging from mine shafts and ore bodies to underground dams.