The millerandage Pinot is from a massal selection of Pinot Noir known as the Valdivieso selection. It is not from a climatic incident as is usual on the grapes.

When I first started to make wines in Chile, back in 2002, I was attracted from the beginning by Biobio as a cold climate region that would suit really well varietals like pinot noir and chardonnay (which have to mature slowly to express the whole of their complexity).
VC Family Estate already had some vineyards planted with pinot noir and chardonnay there, near the small village of Negrete, in an area called Santa Ana.
The soils in Santa Ana are alluvionnal. They can produce very good fruity wines bit you would never get great terroir expression from them because they are not complex enough in terms of minerality. 
So, we decided to plant the hillsides from Millaflores nearby, very complex volcanic soils with a lot of diversity in terms of their mineral complexion. A type of soil with its own unique geology easily transmitable in a grape like pinot noir. 
Meanwhile these vineyards were going to produce, I was still looking at the Santa Ana plantations to learn how the different "Dijon clones" 115 and 777 , we performing in comparaison to the Chilean National selections. 
At the same time we started the Veranda label with chardonnay and pinot noir fruits we were buying from Casablanca (in region of Valparaiso).
The farm where these fruits were coming from also had the "Dijon clones" 115 and 777 plus two of the Chilean National selections.
These Chilean National selections are old massal selections who had been introduced to Chile about 60 years ago or so, back then in order to make sparkling wines.