CB Group Aggregates, a division of CB Group - Find out more
Partners who trust us
Successful projects, satisfied customers
For over a century, Granulats du Groupe CB has specialized in quarrying and mineral processing.
We produce natural and recycled aggregates to meet the needs of companies in industry, construction, and public works, from small businesses to large groups, in France and internationally.
Discover the companies that place their trust in us and the projects that demonstrate our expertise, our commitment to quality, and our know-how.
These are just a few concrete examples that illustrate our performance and the dedication of our teams at every stage.
Our achievements
EOLE PROJECT – Mantes la Jolie railway viaduct (78)
A strategic part of the EOLE project, the Mantes-la-Jolie railway viaduct plays a key role in improving rail traffic in the Île-de-France region. It is located at the heart ofthe Mantes triangle.
Designed to allow trains from Normandy to pass through to Paris ahead of Mantes-la-Jolie, this structure also guarantees futureRER E serviceto Mantes without interference between traffic flows. Thanks to this infrastructure, more trains will be able to run in both directions, significantly improving the fluidity and reliability of the rail network.
Carrières du Boulonnaiscontributed to this large-scale project, helping to improve the daily lives of residents in the Paris region by making travel smoother and more environmentally friendly.
A total of50,000 tons of SNCF-approved aggregates from ourFerques site(62) were supplied for the earthworks carried out by our customersRAZELBEC, Bouygues, and Spie Batignolles.
The delivery of materials from ourmultimodal platform in Limay (78), supplied byrail from Ferques, is a concrete example of our commitment to high-performance logistics solutions with low environmental impact.
Protecting the coastline, safeguarding the future: coastal defense at Hengistbury Head.
Located on the south coast of England, betweenBournemouth and Christchurch bays, the natural site ofHengistbury Headis subject to severe coastal erosion. Protecting this wild headland is a major challenge for the preservation of the coastline and local biodiversity.
CB Groupaggregates, in partnership with theSOCAL quarryin Lanhélin (Brittany), suppliedgranite riprapto reinforce the coastline and ensure its durability against the forces of the sea.
Granite riprap, shipped from theport of Saint-Maloto our clientKML, was then precisely installed byBoskalis to provide long-term protection for the coastline.
This project illustrates our ability to mobilize high-performance technical solutions for large-scale international environmental projects.
We are proud to have taken on this challenge and thus contributed to the preservation of this exceptional site and the species that live there.
EXTENSION OF THE FRANCILIENNE – East Roissy bypass
The eastern bypass around Roissy via the Francilienne motorway is a key development for improving traffic flow in the Île-de-France region and promoting mobility.
As part of this project, our clientEUROVIA Île de Francelaid the asphalt for thetwo-lanehighway usinglimestone materials from our Ferques quarry (62), operated byCarrières du Boulonnais.
Over atwo-year period,100,000 tons of sand and gravelwere delivered to theEUROVIA MPRO asphalt plant in Mitry Mory (77).
All shipments were transported via100% carbon-free rail logisticsfrom ourFerques rail terminal, demonstrating our commitment to low-impact, sustainable transport solutions for the future.
100% recycled concrete aggregate: a high-performance solution for roads and housing developments
As part of roadworks for future housing developments,Carrières du Boulonnaissupplied TERSEN with 100% recycledconcrete aggregate, fully in line with a circular economy approach.
Produced at ourMitry-Mory site, located in close proximity to construction sites, this solutionsignificantly reduces CO₂ emissions associated with transportation, while ensuring technical performance that meets the requirements of road construction projects.
This partnership illustrates our shared commitment toresponsible resource management, thepromotion of recycled materials, andreducing the environmental impact ofurban development, in order to create more sustainable communities.
EMBARCADERE, Boulogne-sur-Mer (62)
Opened in 2024,L'Embarcadère, the new convention center in the city of Boulogne-sur-Mer, has established itself as an iconic cultural and event venue in the region.
To build this structure,Flandres Bétonrelied on local resources fromCarrières du Boulonnais, usingsand and gravelfrom theFerques sitetomanufacture the concrete.
A collaboration that showcases regional expertise
ARCHIPEL PROGRAM, Saint Genis Pouilly (01)
Carrières Blancparticipated in the construction of the "l'Archipel" real estate program in Saint Genis Pouilly by delivering32,000 tons of concrete mix fromtheHautevillequarry(01) to carry out the structural work!
VIARHONA cycle route in Motz (73)
The ViaRhôna cycle route, a cycling route between Lake Geneva and the Mediterranean, is a major greenway project promoting sustainable mobility and the region's appeal.
For the construction of the section connecting Seyssel to Motz (Haute-Savoie), TERELIAN chose materials from ourCarrières Blancsitein Hauteville(01). The work requiredrockfillandbackfill materialsfor the construction of the retaining embankment, as well asuntreated gravelfor earthworks, totaling 8,000 tons of materials.
LYON-TURIN Railway Project
Carrières Blanc is participating in this adventure as a supplier of aggregates for the manufacture of voussoirs by the Epierre factory in Maurienne. By the end of 2025, 20,000 tons of materials had already been delivered, making a concrete contribution to the construction of this major infrastructure for the mobility of tomorrow.
Our production, quality control, and logistics teams work in perfect coordination on a daily basis to support the ramp-up in delivery rates and meet project requirements.
The VERKOR Gigafactory in the Dunkirk area
Carrière du Boulonnaiswas one of the main suppliers for the construction of the platform for the future Verkor Gigafactory located in the municipality of Bourbourg (62). Our client EPV entrusted us with the earthworks, using 50,000 tons of our untreated gravel.
Expansion of the Port of Calais: a major contribution from Carrières du Boulonnais
As part of the expansion of the port of Calais, one of France's largest port projects,Carrières du Boulonnaiscontributed to the construction of marine structures by supplying limestone materials.
Oversix years of work, the company suppliedmore than 2 million tons of materials, including riprap for the construction of the 3 km seawall, as well as sand, gravel for concrete, and untreated gravel.
The scale of the project requiredrigorous industrial and logistical organization, capable of ensuring acontinuous and reliable supplythroughout the construction period.
Thanks to the quality of its materials and its expertise in the production of limestone materials,Carrières du Boulonnaiswas ableto meet the high technical requirementsof a complex maritime construction project designed to ensure the durability and safety of the port of Calais in the face of maritime and climatic challenges.
High-quality materials for building the Grand Paris Express
Les Carrières du Boulonnais is now akey partnerin the new Grand Paris Express metro lines. Industry leaders UNIBÉTON, BSM, and EIFFAGEtrust us for the consistent quality of our materials, which are essential for manufacturing thehigh-performance concreteused in these highly demanding engineering structures.
Thanks to our optimized industrial and logistical organization, more than2 million tons of sand and gravelhave already been delivered to their concrete plants, both fixed and mobile.
Our supplies come from our multimodal platform inMitry-Mory, which is supplied by train: a solution that combinesreliable volumes,control over delivery times, anda significant reduction in our carbon footprint.
Deliveries for Line 15 are continuing at asteady pace, demonstrating our ability to support our customers on large-scale projects with high-performance materials and perfectly secure flows.
They testify
“I am very pleased with the relationship we have. Everyday communication is very easy and pleasant. I am always happy to be in contact with you. I feel that we have built a good trust between us and I feel that we want to help each other in our business. Also challenging situations have been handled with understanding and good cooperation from both sides.”
Best regards
Pauliina Ruonala
Logistics Coordinator
SMA Mineral Oy
"We particularly appreciated this supplier's responsiveness, as well as their ability to listen and understand our needs precisely. The visit to the quarry and the presentation of the different categories of materials enabled us to make choices that were perfectly suited to the constraints of our project. The assembly tests carried out on site were decisive in determining the aggregate that met our requirements. The quality of the materials, as well as the control of the grain size and block size, fully met our expectations. Our philosophy was to work with a local partner who was committed to the success of the project alongside us. It was a complete success."
Philippe AZZI,
IngéMARINE Consulting,
DIKWE project for LEGENDRE Civil Engineering
"Our collaboration with Carrière Blanc is a true relationship of trust.
The quality of the products delivered is consistent and meets our expectations, enabling us to guarantee a high level of performance on our site.Communications with their teams are always professional, responsive, and pleasant, facilitating smooth and effective communication.
Deliveries are well coordinated, which contributes to the smooth organization of our supply chain.
We particularly appreciate their commitment and ability to adapt to our operational needs."
Alexis Froment
Site Manager
EQIOM Bétons
Central-East Region
"I am very satisfied with the quality of your products. They perfectly meet our requirements and we have never encountered any major problems at the Mardyck site. Our relationship is excellent. I particularly appreciate your responsiveness. You are always attentive to our needs and communication is smooth.
I would definitely recommend your company to other clients.
Carole DENIZET
Alternative Fuels – Miscellaneous Raw Materials Category Manager
“Over the course of this second season of the construction of the Princess Elisabeth Island, Carrières du Boulonnais have once again proven their reputation as a proactive and versatile partner for the supply of quarry products.
The intricate nature of the project and demanding timeline appeared to be formidable obstacles at first, however CB managed to tackle the challenges undauntedly and adapt to the ever-evolving circumstances with astonishing flexibility.
Anthony Neyt
Offshore Rock Installation
JAN DE NUL
Thank you very much for your cooperation this year.
We greatly appreciated your flexibility and the clear communication between us.
Your expertise in producing a wide variety of products while maintaining high quality is well noted.
Kind regards,”
Tobias Eeckhout
Offshore Rock Installation
JAN DE NUL
"Our first collaboration with Carrières du Boulonnais dates back to the fall of 2024, as part of a demolition project we carried out in Mitry Mory.
Given the proximity of the Carrières du Boulonnais recycling platform to our construction site, it was an obvious choice for us to work with this partner.
Beyond the geographical proximity that allows us to make the most of our demolition concrete, I really appreciated the fluidity and transparency of our exchanges. Our contacts were always available and responsive, offering solutions tailored to our site requirements, whether it was a range of natural aggregates that met our constraints or a solution for recycling our excavated soil, all while benefiting from optimized logistics.
Agathe Victoire
ENVIRONMENTAL ATTITUDE
"To meet the demand of certain customers looking for concrete containing recycled aggregates, I had the opportunity to visit the Carrière du Boulonnais recycling platform in Rieux (60), which produces recycled 4/20 aggregate.
I quickly got in touch with the local sales representative and was impressed by the quality of the materials produced on site.
We are now working together on the circular economy, and are very satisfied. The materials are high quality, the logistics services are efficient and punctual, and our contacts are available and responsive when needed.
Louis COLOMBO
Production Manager
EQIOM BETONS
"With 15 years of excellent collaboration between our two companies, we are always very happy to continue the adventure with you, Carrières du Boulonnais.
Your logistics department is renowned for its flexibility in dealing with last-minute requests from demanding customers.
Thanks to the quality and commercial follow-up of your services, we have always been able to work with complete confidence and focus fully on our daily activities.
Willy BEUVIN
Head of Asphalt Plant
RAMERY
"To meet the demand of certain customers looking for concrete containing recycled aggregates, I had the opportunity to visit the Carrière du Boulonnais recycling platform in Rieux (60), which produces recycled 4/20 aggregate.
I quickly got in touch with the local sales representative and was impressed by the quality of the materials produced on site.
We are now working together on the circular economy, and are very satisfied. The materials are high quality, the logistics services are efficient and punctual, and our contacts are available and responsive when needed.
Housni Ouled
Quality Manager
Lafarge
The Calais Port 2015 project required the supply of more than 6 million tons of rockfill and aggregates for the construction of dykes and platforms, and the production of concrete and asphalt. The vast majority of these materials were supplied by a consortium of quarries in the Boulonnais basin, of which Carrières du Boulonnais was a member. The contract was carried out with professionalism and adaptability, which made it possible to successfully meet the many constraints of such a project (quality issues, scheduling subject to weather conditions, sustained pace, large volumes, safety, etc.)."
François Quandalle
Bouygues Construction
"Les Carrières du Boulonnais, like Les Carrières du Bassin de la Sambre, are teams we enjoy working with for the supply of riprap and gravel.
Les Carrières is highly adept at adapting to our specific requirements related to our business. The logistics teams are responsive and enable us to organize ourselves as effectively as possible in the event of emergencies, scheduling issues, or storage space issues related to the construction site.
The products supplied are of very high quality and meet our customers' expectations.
Lucyle Duvauchel
Business Manager
REVET TP