A lead mine in eastern Canada had serious issues where a zone of graphite passing through the shaft was swelling with moisture and causing a wedge of concrete to dislodge from the shaft lining.
  Several attempts were made to stop the motion which occasionaly caused the shaft wall to incroach on the movement of the cage. Competing latex / cementitious TSL products were tried, but adhesion to the concrete lining failed repeatedly. There was not enough room to apply shotcrete while allowing the cage to pass.
A composite support solution was devised where steel straps were used to mininmize the displacement of the wedge, and RockWeb was used to hold the edges of the wedge in place. Because of the low thickness and fast cure, holes drilled for the release of water pressure were easily left unobstructed.  
Shaft Sinking

Shaft Lining Repair

Tailings / Water Management