Minera Escondida, Organic Growth Project 1, Tunnel 4

Atacama Desert, Chile


Bechtel Chile LTDA.



Expansion of the Minera Escondida copper mine included constructing a corrugated steel structural plate arch tunnel. The tunnel acts as a buried bridge to carry a haul road over the mine’s conveyor system. During construction of the embankment, the tunnel experienced differential settlement along the length and across the span. On behalf of the contractor, SGH evaluated distress in the tunnel structure and its reinforced concrete footings, and designed repairs.