Limestone (mostly) and spilite (volcanic rock), are byproducts of the nickel-iron ore mining at the company’s mines.

Limestone is suitable for use in the production of cement (CaCO3 >95%, MgO<0,7%, Cr2O3<0,03%), as aggregate in concrete or other uses in construction works (roads, ports, etc).

Spilite is used as aggregate in road bituminous mixtures due to its polish resistant properties (PSV>57).