Magnesite Specialist

Grecian magnesite place
Grecian magnesite place
Grecian magnesite place
Grecian magnesite place
Drilling wagon at Yerakini mines Grecian Magnesite


Sculptures and memorials are not made of it. Almost everything else is. The versatile Μagnesite tacitly participates in the widest range of modern day uses, to the benefit of civilization and the environment.

We’ve played our part. For over sixty years we’ve made it our business to create Magnesite products and grades for practically all industrial applications. Some of them have sprung right out of our laboratory. Most of them we developed alongside our clients. Every single one of them can be traced back to our mines and our superior processing technology.

grecian magnesite specialists background

Magnesite specialists

The Portolos family got into the exciting business of mining in 1914. True to the family legacy and ever eager to excel, the company prioritized R&D and managed to develop products for practically all magnesite applications known to date.

As the magnesite specialists we proudly are, we offer a wide range of application-specific grades of Caustic Calcined Magnesia, Deadburned (Sintered) Magnesia, Magnesium Carbonate (Raw Magnesite) & Basic Monolithic Refractories for a host-lot of industries; from iron & steel, mining & metallurgy to manufacturing, construction, and the environment.

Our expertise and meticulous attention result in products, which lead their field in the consistency of their chemical and physical properties. Quality of products and integrity of our operations have paid off in customer satisfaction and a leading position in international markets.

“They look to the future for the welfare of future generations” 
Dr. Paul Lohmann®

Coming from the EcoVadis 2021 Gold medalist, 
this is not another compliment -it is a recognition.

R & D background

R & D

Next to our expertise in mineral exploration, mining, processing and delivering high quality magnesite products, we do a lot of R&D work. We place special emphasis on research and development and our dedicated R&D center has been operating for the last 3 decades. Our R&D plays a critical role in delivering and shaping corporate strategy by combining market input with scientific insights to improve existing products and develop innovative and high added value products.

Best Sellers background

Best Sellers

Top quality magnesite is a work of nature

[ we provide the rest]

Nature provides the materials that human intelligence turns into high quality products. At times, these materials happen to be of rare quality. This is the case of our highest purity natural calcined magnesium oxide AK98®HR, mined and processed for the most demanding applications. It is a first-class alternative to costly, top-end, synthetic magnesium oxides and the ideal source for a wide range of specialized applications.

Connect with us, background

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Giving back to 
the environment

In more than one way! Most industries try hard (or not that hard!) to mitigate their impact on the natural environment, or put simply, to do less harm. We have been walking down that path for more than a century already: vegetation, pure air and clean water are the earth’s most valuable resources. No toxic or hazardous materials are used during our mining and production processes, thereby safeguarding our environment. The use of thickeners allows us to recycle and recover more than 90% of the water used in production. We use the most advanced and effective filtration systems to control emissions, we increasingly replace fossil fuels with sustainably-produced biomass and we operate a state-of-the-art flue gas desulfurization (FGD) plant.

In our efforts to restore nature we use special software for surface planning and automated watering; we replace topsoil and revegetate using trees from our own plant nursery. We take every pain to preserve nature in an area long appreciated for its beauty.

We also make products for the environment: soil decontamination applications and wastewater or flue gas treatments prove that magnesium oxide has an active, multifunctional role in neutralizing pollutants. 

Olive trees cultivation in Grecian Magnesite Yerakini mines & works

Magnesite stories

The new Evia Underground Mine

The new Evia Underground Mine:
narrow vein mining, broad-minded investment

On the island of Evia, Greece, we are more than favored by probably one of the purest magnesite deposits on the entire planet. Above ground, this is also a place of exceptional natural beauty and of relatively untouched flora and fauna habitats. Mining in our region has always been a balancing act: respect, preserve, produce. Those are the guiding values for our newest mine.