Les Pierrières is a 1.2-hectare monopole in Vert-Toulon, the next village over from Collin's home village of Congy. The southeastern-facing plot features vines averaging 40 years old and chalky soils that also feature chunks and pockets of a rare black flint or silex noir. Pierrières was Olivier Collin's first bottling, and only bottling, in the 2004 vintage, albeit without the name of the site on the label at that time. As for all Collin Champagnes, the fruit is hand-harvested and pressed; the juice is lightly sulfured and settled overnight, then fermented spontaneously and slowly with natural yeasts in oak, with the reserve wine spending an extra year in barrel; the wine is bottled without fining, filtering or sulfuring and aged sur lattes for an extended period, 3 years in the case of Les Pierrières. The wine is disgorged and finished with a small dosage of 1-2 grams/liter at most.