Construction of the reconnaissance gallery for the future Montezic II plant, secondary gallery(s) and a reconnaissance campaign for future structures (Factory and downstream balance chimney)

Construction of the underground reconnaissance gallery for the Montézic II plant (quantities are estimated):

1) Construction of the reconnaissance gallery for the future Montézic II plant (727m, section 47m²) and a secondary gallery (196m, section 27m²) using the traditional method. As an option, construction of the reconnaissance gallery for the future balance chimneys downstream of the plant (339m, section 19m²).

2) Carrying out a survey by soundings at the right of the future plant and optionally at the right of the downstream balance stacks.

3) Marinating and backfilling of excavated material (80,000m3) for the creation of platforms. Carrying out roadworks at the entrance to the reconnaissance gallery and at the level of the platforms created.