Raise Boring of the Migollas 2 ventilation shaft. Sotiel Coronado mine. Huelva

Owner: Sandfire Matsa
Client: Sandfire Matsa. UTE Works

Drilling, placing and grouting of 8 micropiles 12m deep surrounding 1m of the raise boring pit diameter. Drilling of 8 boreholes 88m deep located in a staggered pattern with the micropiles at 0.5m from the diameter of the shaft, and subsequent selective upward injection with the use of pluggers and injector with injection parameter control (pressure, flow, volume…). Selective upward injection from the raise boring pilot hole with a special large diameter (255 mm) plugger.