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construction equipment working at a gypsum mine

The Antrim Gypsum Project

Project Overview

 

The Antrim Gypsum Project (the Project) is located approximately 50 km northeast of Halifax, Nova Scotia (NS), in the community of Lake Egmont, NS. The mine site will be accessible from the Lake Egmont Road

Pipeline right of Way path lined with grass and trees

PROPOSED SITE LOCATION IN COOKS BROOK, NOVA SCOTIA

Project Highlights

 

  • The Antrim Project includes construction, operation, reclamation (progressive and final) and closure activities for an open-pit gypsum mining facility. Construction is proposed to start in 2026, with gypsum production and transport commencing in early 2028. The mine is expected to operate for more than 20 years.
  • The Antrim Project will supply high purity gypsum at an estimated average rate of 1.5 million tonnes per year for wallboard production. Lower purity gypsum and anhydrite will also be produced for cement and agricultural products.
  • Gypsum will be transported via trucks to an existing port facility in Sheet Harbour, Nova Scotia, for shipment to manufacturing plants in eastern North America.
  • The Project is expected to generate new jobs and business opportunities for the local community, providing a significant boost to the provincial economy.

Project Team

 
Project Leader: CertainTeed North America– Mining & Mineral Resources Department

Our MMR Department, responsible for leading the Antrim Gypsum Project, is a multinational team of experienced Ph.D. Geologists, Geoscientists and Professional Mine Engineers, with many years of experience in gypsum mineral resources, sustainable mining projects, and biodiversity management successes in gypsum mines and quarries.  

Project Support

A group of highly skilled professionals, working for the following consultancy companies, have been supporting the Antrim Gypsum Project. 

Mining Method

 

The Antrim Project will use Surface Miner Machines to mine the gypsum in thin horizontal cuts, reducing the need for traditional drilling and blasting operations. Pit development and mining will begin at the north end and advance south through six phases (or pushbacks). 

Operations Activities

  • Overburden stripping – excavation of overburden (soils and rock materials covering the mineable gypsum).
  • Rock surface preparation – cleaning rock surface and levelling for mining (may require occasional blasting efforts).
  • Mining of gypsum – Surface Miners will cut strips of gypsum in horizontal lifts; load and haul equipment will move the cut gypsum to the stockpile area.
  • Backfilling the pit – previously mined out phases of the pit will be filled with overburden and process rejects (gypsum fines generated from sizing and screening mined gypsum).
  • Progressive reclamation (ongoing during mining operations) – overburden and topsoil materials will be placed, and vegetation encouraged or planted as soon as possible and practical to initiate site restoration and minimize the overall disturbed footprint.

 Post-Operations Activities

  • Closure reclamation – will be completed at the end of mining and will include the decommissioning and removal of infrastructure no longer required for the project and preparing the site to return to a pre-mining natural state.
  •  Post-closure monitoring of the site – will continue as required after closure activities have been completed.

Proposed Equipment

  • Surface Miner Machines (primary mining units)
  • Excavators and front-end loaders (primary loading units)
  • Rigid frame and/or articulated haul trucks (primary hauling units for rock and overburden)
  • Track dozers, excavators, graders, and water trucks (mine support fleet)
  •  Light vehicles, maintenance trucks, mine rescue vehicles, and crew vans (mine staff & contractor fleet) 

Mined Gypsum Product

The Antrim Project will produce marketable gypsum and anhydrate at an estimated average rate of production of 1.5 million tonnes per year, divided into three different products and markets, based on size and purity:

 

Drywall

Wallboard Grade Gypsum

Higher in purity, sizing 1/4" to 6".

Mined for the East Atlantic gypsum industy

Icon-Products-White

Cement Grade Gypsum

Medium/low purity, sizing 0" to 6".

Mined for the East Atlantic and local cement industry

Agriculture icon

Agricultural Grade Gypsum

Spreadable Agri gypsum, 0" to 1/4" fines.

Processed for local and Canadian farming and agricultural market

Our Gypsum Products

 

The majority of the mined gypsum supplied from Antrim, will be used to manufacture our sustainable and light construction products (our Drywall / wallboard gypsum products).

Sustainability & Biodiversity

Our Goal: Reduce Carbon Emissions

One of the major drivers of carbon dioxide emissions in the production of gypsum wallboard is in the transportation of gypsum supplies to the manufacturing facilities. With a major supply of the mineral in Spain, gypsum will often have to travel by barge for thousands of miles to reach Canada and North America. This can be a carbon intensive process. By strategically locating the Antrim Mine in Nova Scotia, CertainTeed will be able to supply its facilities in the Eastern provinces with Canadian gypsum and significantly reduce transportation miles and Scope 3 carbon dioxide emissions.

gypsum mine with flowers and greenery in the foreground and green mountains in the background

Saint-Gobain Gypsum Mine in Europe

Biodiversity Best Practices

In North America, gypsum is extracted from open-cast mines. The mined gypsum is crushed and screened to remove 'fines' (mainly a mix of clays, silt and gypsum low in purity). The extraction process implies an unavoidable impact on the landscape and the environment. However, mining activity does not necessarily mean loss of biodiversity and danger for ecosystems.

The gypsum mines managed by CertainTeed, a Saint-Gobain company, commit daily and on the field to the conservation of nature and preservation of biodiversity by bringing constructive solutions to the environmental impacts of gypsum quarrying.

  • The quarrying of gypsum formations creates habitats that hardly exist in our intensively used landscapes.
  • Based on Saint-Gobain's global gypsum experience, multiple case studies and scientific research, sustainable quarrying results in:
  • Open, sunny areas, for species that need light and warmth
  • Creation of wetlands and water reservoirs, in dry areas
  • Creation of structural diversity and wildlife refuge habitats, beneficial for pioneer species that require recurring disturbances for their survival.
  • Reclaim of sodic soils and/or nutrition improvement of the soil conditions poor in Calcium and Sulfur content
  • Successful recultivation and natural rehabilitation effect, due to the chemistry of the gypsum formations
  • Valorization of local habitats and biodiversity, proving controlled access to public fruition and investing in trails and informative panels
  • Few biodiversity projects and sustainable reclamation practices have been awarded by institutions

 

Karst system and Cave of Rio Tiberio

Saint-Gobain Gypsum Mine Property in Europe

Environmental Commitment

CertainTeed's sustainability commitments include:

  • Decarbonizing Construction: Shifting the paradigm toward homes, offices, schools and hotels that emit less carbon throughout their lifecycle, from materials and industrial processes through use and demolition.
  • Building Resiliency: Designing innovative materials and driving smarter construction that withstands weather extremes and extends the life of our buildings
  • Circularity is the Solution:  Remimaging the design and construction to better manage our resources through circular business practices: waste collection, repurposing materials, and recycling.
  • Transparency and Performance: Dedicated to healthy environments that take care of people, CertainTeed is leading in the breadth of our portfolio with HPDs and EPDs.

 

Provincial Environmental Assessment

 

The project received Environmental Assessment approval on October 25th, 2024.
The Environmental Assessment Registration Document can be found here.

A group in safety gear looking at a gypsum mine

Career Opportunities

 

In 2024 and for the 9th consecutive year, Saint-Gobain received the "Top Employer Global" label. After an analysis of our HR practices and our working conditions, we were recognized among the best employers in the world. This title is only held by 17 companies around the world.

The Antrim Project is expected to create 65 direct full-time jobs during operations.

Additionally, The Project is expected to create contractors, service and consultancy job opportunities during pre-engineering, construction, operations and transportation, including job opportunities at Sheet Harbor site, due to the increased business generated by the Mine.

Advertised job opportunities will be posted on the Antrim Project website as well as other common career sites.  

Looking For Your Next Career?

CertainTeed and its affiliates proudly employ more than 6,300 people and operate more than 60 manufacturing facilities throughout Canada and the United States. Come be a part of our team!

See Job Openings

Latest News

Please see the Antrim news archive for older posts

 

Community Liaison Committee (CLC) Update – Fourth Meeting – May 28, 2026
May 2026
Community Liaison Committee (CLC) Update – Third Meeting
January 2026
Community Liaison Committee (CLC) Update – Second Meeting
Community Liaison Committee Post

Frequently Asked Questions

What is CertainTeed?
What is the lifespan of this Project?
How will the gypsum be mined?
Is gypsum recyclable?
What jobs will be created at the Antrim Mine Operation?
What is the Antrim Project?
Where is the Mine located?
What is gypsum?
Is gypsum sustainable?
What infrastructure will be built on the site?
What is CertainTeed's corporate environmental policy?

Contact Us

Use the form below to reach out with questions or comments about the Antrim Gypsum Project. You may also email us at [email protected]

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