Minas de Barqueiros, S.A., has a concessionary contract with the Portuguese state to explore an area of 200 hectares of a sedimentary china clay mineral deposit in Barqueiros - 35 km north of Porto - Portugal. This deposit is essentially composed by Kaolinitic sand layers. Then in the western area of the deposit there is a level of quartzitic pebbles that decreases in thickness and finishes in the eastern area.

The kaolinitic levels go from extremely high degrees of whiteness to a shade of yellow. The extraction method is through excavation and is than transported from the sites to the storage or the washing area. This is the most suitable method to allow a good selection of the material.

The china clay is extremely fine and the silica sand of round grain. The sand from the whitest levels have a extremely low percentage of iron.

The quartizic peblles are white, but when wet show spots and grooves which makes a chameleon pebble. These pebbles exist in several sizes.

The associated company Campados - Caulinos do Norte, S.A., has a concessionary area of 100 hectares of china clay deposit of thicker grain of a white to yellow color. The silica sand grain is more angular and presents low percentage of mica and feldspar.

The extraction method is identical to Barqueiros Mines. Both mines at Barqueiros and Campados have million of tons of raw material reserves.