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Experience

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Clean-up and maintenance works in the galleries of the Bodovalle mine, in Biscay

The Bodovalle mine was the largest open-pit siderite mine in the Biscayan mining basin. It was exploited in open pit until 1885. From that date, the mineral extraction was carried […]

Execution of the Mina Fraguiña Project

Execution of 1,045 meters, of which 410 meters correspond to the execution of central galleries of 30 m2, with widening areas to form caverns of 200 meters in length and […]

Aduna Tunnel. New Railway Network in the Basque Country. Section: Zizurkil-Andoain

The length of the Aduna Tunnel is 4690 m. Nortúnel excavated from the mouth on the Andoain side a mine tunnel with a length of 1479 m, with an excavation […]

Calatayud diversion tunnel. Hydraulic correction of the Barranco de las Pozas

Tunnel with a length of 308.91 m with an excavation section of some 23 m². The excavation took place using mechanical methods (ITC) in conglomerate and clay loam.

Buciero Tunnel. Santoña – Laredo – Colindres Collector.

A tunnel 1500 m in length and with a 16 m² section to install a collector. Excavated using blasting and mechanical means on highly karstified limestone.

Nafarrondo quarry tunnel shaft system.

Innovative system in operation of quarries to eliminate waste of blasting materials on the front part of the quarry. It prevents the formation of dust and reduces the generation of […]

Rigoitia tunnel shaft

Operation system of the quarry with a tunnel of 45 m² section and 87 m in length, which feeds to a 4 m diameter and 140 m depth shaft with […]