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.
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
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.
quartizic peblles are white, but when wet show spots and grooves which
makes a chameleon pebble. These pebbles exist in several sizes.
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.
extraction method is identical to Barqueiros Mines. Both mines at
Barqueiros and Campados have million of tons of raw material reserves.