Our History

More than half a century opening ways



Founded in Asturias (northern Spain), originally dedicated to mining (galleries and shafts)
Important mining areas: Almadén, Iberian Pyrite Belt in Huelva, Linares and Suria


OSSA began hydraulic work
Projects: Hydroelectric Plants in Miranda, Conso, Toga; Nuclear Power Plant in Cofrentes, etc.


As a result of the downturn in Spanish mining, OSSA diversified its activity into the construction of road and rail tunnels

1985 - 2008

The company focussed its activity on roads and railways throughout Spain, working on major infrastructure development projects in Spain
Road tunnels: Guadarrama, Cadí, Negrón, Piqueras etc.
Railway tunnels: high-speed network AVE (e.g. Pajares, San Pedro, Ontígola etc.)

OSSA is currently involved in constructing the main railway network (AVE) and developing roads in Spain


In July 2008 Mercapital took majority ownership in conjunction with the Management Team. The original shareholders reinvested in a number of shares and they remain as minority shareholders

2008 - Actualidad

Key positions in the Management Team have been strengthened (CEO, COO, CFO, International Director), while maintaining the know-how of the previous team, as the company works towards reaching its new identified goals

Improvements in IT systems and Management Control

Launch of International Operations, having secured contracts worth over €682 million in Europe, Asia and Latin America, and working as a partner in deals in Emerging Markets


More than 900 Km of tunnels

› More than 75 Km of the Spanish High-Speed railway (AVE) in the last five years
30% de cuota de mercado

More than 800,000 m³ of caverns built for hydroelectric power plants in the major Spanish facilities

OSSA has established experience in mining in Peru and Chile.

More than 75 Km of shafts

More than 70% of the shafts built in Spain in the last fifteen years
Important clients include Rio Tinto, Hunosa, Iberpotash, CODELCO, Metro Santiago de Chile, MTR (Hong Kong)

Strong international presence. OSSA is present in over 15 countries.

More than 7 contracts for the Santiago Metro, Chile.