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A large-scale site striving for maximum productivity See more, know more, do more with VisionLink® Productivity At 128 hectares, Groupe Pigeon’s Les Vallons Quarry is the largest quarry in Brittany, France. Every year it produces 1.8 million tonnes of construction material for both public and industrial applications such as concrete plants, asphalt and precast plants. It also helps to recycle and process waste, concrete and asphalt residues.