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Soto Norte Project

Sociedad Minera de Santander

Minesa plans to commission the Soto Norte Project to reach a gold deposit located ~34 miles (~54 km) north­ east of Bucaramanga, the capital city of Santander. The proj­ect aims to produce more than 9 million ounces of gold over a lifetime of approximately 26 years, with an estimated invest­ment of $1 Billion over the next 5 years, with approximately $160 million for the construction of the mine access tunnels.

Consulting Services: Tunnel Rock Bolt Design and Geologic Evaluation Review:

Approximately 4.1-mile-long (6.6 km) twin tunnels are required to reach the gold deposit from the chosen portal area. These tun­nels have a parallel alignment for approximately half of the tun­nel length, with the upper bore remaining at roughly the same elevation along the alignment. Meanwhile  the  haulage  tunnel  will traverse a 10% decline halfway  and level  out at the  bottom of the ore body. Excavation of the  twin  tunnels  will  be carried out by a combination of conventional tunneling and Tunnel Bor­ing Machine (TBM) tunneling methods. The conventional tunnel­ing will be implemented over the initial ~500 m of the alignment, followed by TBM excavation up to the end of the alignment

Gall Zeidler Consultants (GZ) is providing Minesa technical and advisory support during the early stages of project development. Our work includes the review and assessment of the geotechni­cal conditions along the tunnel alignment, providing recommen­dations for the execution of the tunnels, conceptual tunnel sup­ port design, development of TBM specifications, assist in the production of procurement documents, as well as, review and assess TBM Supply and TBM Operations proposals. GZ’s tech­nical and advisory support will continue during construction.


Bucaramanga, Colombia


2017 – present


Mine Access Tunnels


8.2 miles (13.2 km) Length: Total Length (Two Bores)


26.9 ft (8.2 m) Diameter


Precambrian gneiss and intrusions of the Santander M ssif with sedi­mentary and volcanic sequences. Limestone , shale, and sandstone (the Andes) .


$160 Million


Sociedad Minera de Santander


Sociedad Minera de Santander