Canada has a well-developed lime and limestone industry, with a few major producers supplying materials for construction, steel, mining, agriculture, water treatment, pulp and paper, and environmental applications. The main names include Graymont, Carmeuse, and Omya, along with regional limestone and aggregate producers.
Graymont
Graymont is one of the most important lime producers in Canada and has a broad network of production facilities across the country. It supplies both lime and limestone products for industrial and construction uses.
Its products include:
- Quicklime
- Hydrated lime
- Dolomitic lime
- High-calcium limestone
- Pulverized limestone
- Agricultural limestone
- Limestone aggregates
- Construction stone
- Specialty lime products
Graymont serves industries such as steel, mining, water treatment, agriculture, construction, glass, pulp and paper and environmental services. Its high-calcium limestone is also used as a raw material for lime production and in industrial processes.
Carmeuse
Carmeuse is another major lime and limestone producer with important operations in Ontario, including its large Beachville operation.
The company supplies:
- High-calcium quicklime
- Dolomitic quicklime
- Hydrated lime
- Dolomitic hydrated lime
- Lime slurry
- Limestone aggregates
- Chemical-grade limestone
Its products are used in steelmaking, water treatment, environmental applications, mining, agriculture, glass, construction and pulp and paper.
Carmeuse is particularly notable for its ability to produce different grades of lime for industrial processes where chemical consistency is important.
Omya Canada
Omya has a different position in the Canadian market. It is particularly known for calcium carbonate and specialty mineral products, rather than being mainly a traditional quicklime producer.
Its Canadian operations produce and supply calcium carbonate products used in areas such as:
- Construction
- Paints and coatings
- Adhesives and sealants
- Plastics and polymers
- Pulp and paper
- Agriculture
- Food and other specialty applications
This makes Omya more focused on processed and specialty mineral solutions than the traditional lime-and-kiln business.
Crushed and Specialty Limestone Producers
Canada also has many regional companies supplying crushed, screened and graded limestone for construction and agricultural applications.
These products include:
- Road base
- Aggregates
- Agricultural limestone
- Limestone fines
- Drainage stone
- Riprap
- Landscaping stone
- Industrial-grade limestone
The exact products available depend heavily on the limestone deposits and processing facilities in each province.
How the Main Companies Differ
Graymont has one of the broadest Canadian portfolios, covering quicklime, hydrated lime, dolomitic products, high-calcium limestone and construction materials.
Carmeuse has a strong focus on industrial lime and chemical-grade limestone, with major customers in steel, environmental services, mining and other heavy industries.
Omya is more focused on calcium carbonate and specialty mineral products, serving industries where controlled particle size, purity and material performance are important.
Main Industries Served
Lime and limestone products are used across several major Canadian industries:
- Steel: Lime is used in steelmaking and impurity removal.
- Mining: Lime helps control pH and supports mineral-processing operations.
- Water treatment: Lime is used for pH adjustment and water purification.
- Construction: Limestone is used for aggregates, road materials and asphalt.
- Agriculture: Agricultural limestone helps manage soil acidity.
- Pulp and paper: Lime and limestone are used in several processing stages.
- Glass: High-quality limestone and lime are important raw materials.
- Environmental control: Lime can be used for wastewater treatment and air-pollution control.
Conclusion
Canada's lime and limestone industry combines large integrated producers with regional quarry and aggregate suppliers. Graymont is particularly broad in lime, limestone and construction products, Carmeuse is strongly connected with industrial and chemical-grade lime, while Omya focuses more on calcium carbonate and specialty mineral applications. Together, these producers supply materials ranging from basic crushed limestone to high-purity quicklime, hydrated lime and specialized mineral products.