Château Duc d'Arnauton AOC Graves Supérieures (semi-sweet white wine) Area: 1/2 ha. Location: Landiras. Average age of vines: 30 years old. Soil type: Strongly clayey, limestone (sub-soil). Grape-varieties: 70% Semillon, 30% Sauvignon. Density of plantation: 5 500 plants per ha. Vinification: By successive waves of hand picking. Maturing: Ageing in oak barrels for six months (from October to April).