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Cigar Lake Operation

Owner:
Client:
Service:
Site supervision services, consulting, monitoring and on-site design performed by senior engineer and two tunnel inspectors.
Estimated cost: Commencement:
September 01, 2012
Completion date:
Ongoing
Location:
2121, 11th St W
Saskatoon, SK S7M 1J3
Canada
Technical data:
Geology description:

Highly thermo hydraulically weathered metapelites in form of weak rock and clayey-silty-sandy soils, highly anisotropic, cut with slickensided graphitic planes.

Geology types:
Categories:
Bid cost: Final cost:
$50 million CAD
Service areas:
Construction methods:
Description

Cameco Cigar Lake is the world's highest grade uranium deposit. It is considered one of the world's most technically challenging uranium deposits to mine. The ore body and the ground around has to be bulk frozen prior to extraction of the ore using high pressure water jets. Development of the freeze/production cross-cuts take place beneath the ore body in unstable, soil-like highly weathered and anisotropic rock. A flexible shotcrete lining with longitudinal slots of special yielding elements together with systematic rock bolting were utilized to cope with squeezing ground conditions.

Pocket excavation in unstable ground conditions
Installed yielding elements prior to spraying shotcrete