The river mainly transports rhyolites, granite and a few metamorphic rocks. These alluviums and colluviums are deposited to the east, thus forming a sort of fan. The biggest rocks will form the soils of the highest part of the valley, to the west, while the finest particles will finish their journey on the plains, thus enriching its soils. The soils of Chacayes are therefore mainly made up of coarse alluviums and colluviums.
In Chacayes there are different types of soils and terroirs depending on the position in the fan and the altitude. Our Malbec Petit Voyage (link) comes from a relatively new estate in the high part of Los Chacayes at 1,300 masl. These vineyards were planted 20 years ago and are the last ones before reaching the cordillera. EIn this region, poorer, extreme, alluvial and colluvial gravel soils are usually found (profile photo).