What Premier Magnesia, LLC does

Premier Magnesia, LLC is a vertically integrated magnesia-based chemical company headquartered in Waynesville, North Carolina. The company operates the only commercially active magnesia mine in the United States, located in Gabbs, Nevada, and has done so for over 50 years, alongside manufacturing facilities in Greendale, Indiana and Hazelwood, North Carolina. It produces magnesium oxide (MgO) and magnesium hydroxide (Mg(OH)₂) products serving five primary end markets: agriculture and animal nutrition, water and wastewater treatment, construction and concrete, industrial manufacturing, and environmental remediation.

Its product portfolio includes high-purity calcined MgO (MAGOX) for animal feed and soil fertility, magnesium hydroxide slurries (AQUAMAG, THIOGUARD) for water and industrial treatment, the PREVent-C shrinkage-reducing concrete admixture, the Nutri-Mg++ potable water treatment process, the MgBalance biosolids program, EnviroBlend environmental remediation products, and the Giles Chemical Division's magnesium sulfate (Epsom Salt) line, in which it is the largest North American producer. Technical differentiators include domestic ore sourcing, GRAS-certified non-hazardous slurries, a 60% concentrated Mg(OH)₂ product, a claimed 60% solids content superiority over 50% competitors, and the MgOPS cloud-based data collection system for multi-site water treatment operations. The Giles Chemical Division produces USP, technical, and agricultural-grade magnesium sulfate heptahydrate.

The business operates as a B2B enterprise with quote-based pricing, multi-year industrial contracts, and direct field sales across industrial, agricultural, and water treatment customers. Distribution occurs through corporate direct sales, US-wide distribution terminals for liquid products, tank truck and railcar delivery, and packaged goods shipping. In July 2025, Martin Marietta Materials (NYSE: MLM) completed the acquisition of Premier Magnesia as a wholly-owned subsidiary to expand its magnesia-based products portfolio; parent 2025 consolidated revenue was $5.7 billion, but Premier Magnesia's standalone revenue is not publicly disclosed.

Name

Premier Magnesia, LLC

Legal name

Premier Magnesia, LLC

Website

https://premiermagnesia.com

Company type

Private

Founded year

1970

Operating status

Acquired

Headcount range

101–250 employees

Short description

Premier Magnesia is a vertically integrated magnesia chemical company operating the only commercial magnesia mine in the US, producing magnesium oxide and hydroxide products for agriculture, water treatment, construction, industrial, and environmental remediation markets.

Ownership category

akta.pro rank

Product category

Specialty Industrial Chemicals

NAICS

Sand, Gravel, Clay, and Ceramic and Refractory Minerals Mining and Quarrying (21232), Nonmetallic Mineral Mining and Quarrying (2123), Other Nonmetallic Mineral Mining and Quarrying (21239), Ground or Treated Mineral and Earth Manufacturing (327992), Phosphatic Fertilizer Manufacturing (325312), Coal and Other Mineral and Ore Merchant Wholesalers (42352)

SIC

Mining & Quarrying Of Nonmetallic Minerals (No Fuels) (1400), Abrasive, Asbestos & Misc Nonmetallic Mineral Prods (3290), Wholesale-Metals & Minerals (No Petroleum) (5050)

akta.pro primary industry

Magnesite & Magnesium Minerals Mining (IMAKAGAN)

akta.pro secondary industries

Magnesite & Magnesium Minerals (IMAEAFAL), Mineral Premixes (AFADAGAB), Trace Mineral Premixes (Chelated/Organic & Inorganic) (AFADAGAD), NPK/Compound & Blended Fertilizers (Granular Blends, Bulk Blending) (AFABABAD), Fertilizer Raw Materials & Intermediates (Phosphate Rock, Sulfuric/Phosphoric Acid, Potash Ore/Brines) (AFABABAH)

Keywords

• Magnesia products
• Magnesium oxide chemicals
• Magnesium hydroxide slurry
• Concrete admixtures
• Water treatment chemicals

Headquarters

HQ city

Waynesville

HQ country

United States

HQ region

North America

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Infrastructure, Marketing or Sales, Others

Revenue model

1. Magnesia-Based Products Sales: Sale of magnesium oxide and magnesium hydroxide products for agricultural, industrial and water treatment applications. Products include MAGOX feed grade, AQUAMAG slurry, THIOGUARD, PREVent-C concrete admixture, and Giles Chemical Epsom Salt products.
2. Technical Services and Consulting: Application consulting services, inventory management services, equipment management services, and technical support for water and wastewater treatment customers.

Pricing tiers

Go-to-market motion1 record

Distribution channels5 records

Marketing channels7 records

Core offering

Premier Magnesia, LLC mines magnesia ore at its Gabbs, Nevada operation (the only commercial magnesia mine in the United States) and manufactures magnesium oxide and magnesium hydroxide products for sale to agricultural, industrial, water treatment, construction, and environmental remediation customers. The portfolio spans animal feed (MAGOX), plant nutrition (Magriculture magnesium sulfate), wastewater treatment (AQUAMAG, THIOGUARD, Nutri-Mg++, MgBalance), concrete admixtures (PREVent-C), environmental remediation (EnviroBlend), Epsom Salt/magnesium sulfate (Giles Chemical), and Sorel cement feedstock (Oxymag). Sales are conducted via B2B direct enterprise sales, distribution terminals, and bulk tank truck/railcar logistics.

Product overview

Premier Magnesia, LLC is a global market leader in magnesia-based products and solutions for agricultural, industrial, and environmental markets. The company operates a vertically integrated structure with multiple divisions: Premier Magnesia core magnesia products (MAGOX®, AQUAMAG®) sourced from their Nevada mine; the Construction Products Group (CPG) offering PREVent-C® concrete admixtures; the Giles® Chemical Division producing Epsom Salt (magnesium sulfate); and MgWater™ platform providing water treatment solutions including THIOGUARD®, Nutri-Mg++®, and MgBalance™. The portfolio serves applications ranging from animal nutrition and agriculture to wastewater treatment, concrete construction, and environmental remediation.

Differentiator

Problem solved

Functional benefit

Products and services

• MAGOX® High-purity calcined magnesium oxide used as a magnesium supplement in animal feed, soil fertility, and plant photosynthesis applications for agricultural customers.
• AQUAMAG® Magnesium hydroxide slurry used for acid waste neutralization, wastewater treatment, SOx control in coal- and oil-fired power plants, and pulp and paper applications.
• PREVent-C® Shrinkage-reducing and crack-control concrete admixture for bridge decks, industrial flooring, water containment structures, and other infrastructure applications where reduced shrinkage cracking is required.
• THIOGUARD® 60% concentration magnesium hydroxide slurry for municipal wastewater treatment, odor control, corrosion protection, and biological process optimization in water utilities.
• Nutri-Mg++® Enhanced potable water treatment process using magnesium hydroxide to replace caustic soda and soda ash while providing an essential magnesium nutrient and supporting disinfection byproduct compliance.
• MgBalance™ Comprehensive biosolids treatment program and resource recovery solution for wastewater utilities, focusing on nutrient treatment and sludge management.
• Giles® Chemical Magnesium Sulfate (Epsom Salt) Products Magnesium sulfate heptahydrate (Epsom Salt) products in USP grade, technical grade, and Magriculture agricultural grades, sold in packaged and bulk formats for agricultural, industrial, and retail customers.
• EnviroBlend® Magnesium-based reagent products for heavy metal contaminated waste treatment, groundwater and soil remediation, and brownfield and Superfund site reclamation.
• Magriculture® Agricultural-grade magnesium sulfate heptahydrate for plants and animals, OMRI certified for organic crop fertilizers, soil amendments, and livestock feed applications.
• Oxymag® Magnesium oxide specially produced as a feedstock for Sorel cement manufacturing.
• Amphomag® Magnesium-based product line sold under the Amphomag brand for industrial applications including fire retardant uses.
• MgOPS® Cloud-based data collection and management system providing access from any location with concurrent user support for equipment selection, placement, management, and maintenance of water treatment instrumentation across multiple sites.

Quantifiable outcome

• Provides 27% more alkalinity than lime or 37% more than caustic soda
• +5 more outcomes

Named customers6 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Scale indicators4 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• RHI Magnesita: Global leader in refractory and magnesia-based products with vertically integrated mining and processing; directly comparable to Premier Magnesia in magnesia chemistry and industrial end-markets, but at much larger scale and international footprint.
• Martin Marietta Materials: Parent company of Premier Magnesia; a major U.S. aggregates and building materials producer with overlapping customer relationships in construction and infrastructure, and the acquirer that integrates Premier's products into a larger portfolio.
• Imerys: Global specialty minerals producer with operations spanning performance minerals, including some magnesia-related and refractory product lines—comparable in specialty industrial minerals and downstream applications.

Direct peers

• Magnesita Refratários (now part of RHI Magnesita): Historical South American magnesia and refractory producer offering comparable calcined magnesia and magnesium hydroxide products for steel, industrial, and agricultural applications.
• Grecian Magnesite: Greek-based vertically integrated magnesia miner and producer serving similar industrial, refractory, environmental, and agricultural applications—directly comparable in mining-to-product model.
• NedMag Industries: European producer of magnesium oxide and magnesium hydroxide from brine sources, serving industrial, environmental, and animal feed markets with comparable product chemistry.
• Hawkins, Inc. U.S. specialty chemical distributor and formulator serving water treatment and industrial customers with complementary chemistries (including acid neutralizers and water treatment chemicals); comparable in water and wastewater treatment customer base.
• US Lime & Minerals: U.S. producer of lime and limestone-based products competing directly with magnesia in water treatment, steel, and environmental applications; relevant as a substitute chemistry supplier to overlapping customers.
• Premier Chemicals (BPM Minerals): Specialty chemical producer offering magnesium hydroxide and related chemistries for environmental and water treatment applications; directly comparable to Premier Magnesia's AQUAMAG and THIOGUARD product lines.

Regional players

• Ube Material Industries (Ube Industries): Japanese magnesia and specialty chemicals producer serving Asian industrial markets; comparable in magnesia chemistry but geographically focused on Asia rather than North America.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/premier-magnesia-llc

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Subsidiaries3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Premier Magnesia, LLC