The Pyhäsalmi Mine, located in the town of Pyhäjärvi, Finland, is one of the deepest known mines in Europe reaching 1,445 metres underground. As mining will end, a globally unique multidisciplinary operating environment, Callio, will emerge. The mine and the surrounding brownfield area offer a diverse range of opportunities for success for new and innovative projects and established operators seeking new horizons alike. Will your business be one of the first to seize the opportunity?

Latest news »

Super big news for Pyhäjärvi! The pumped hydro storage plant is going forward. €26.3 million investment support for Finlands Energy Storage Ltd. 2.September 2021.  Read more.

Callio TestMINE project has received positive funding decision from Business Finland on 24.8.2021. Read more. (Finnish)

Testing, Developing, and Operating a Geothermal Energy Solution.Intention is to drill the deepest bore hole in Europe, generate green electricity and test new use cases for the technology EURACTIV. 22.4.2021. Read more.

Callio Underground Rescue animation video released from ACUUS 2021 seminar 3-4.February 2021.

What type of bioenergy terminal concept would be a profitable part of Callio? Mr Martti Kettunen has started as a project manager for this interesting feasibility study. Read more (Finnish).

There are some beautiful things taking shape in the town of Pyhäjärvi, Finland. Located in the one of the deepest known places in Europe, in the depth of Pyhäsalmi mine, an operation environment Callio offers one of fewest underground research facilities in the whole world. Please read more here.

Latest publications »

Callio press release 1.11.2022: Callio FutureMINE digital testmine of the future – 2,1 m€ Business Finland funding has been secured. Read more.

Callio press release 18.5.2022: A huge solar power plant to the mine tailing ponds – on green electricity operating concentrator plant is the first of its kind in Finland and in the world. Read more.

Callio press release 10.5.2022: Centria University of Applied Sciences and Pyhäjärvi Callio will commercialize MineTRAIN training for the mining industry and underground construction in the Pyhäsalmi mining area. Read more.

Callio press release 21.12.2020: Better Underground Occupational Safety – first trainings have started in Callio Pyhäjärvi. Read more.

Press Release 19 Dec 2018: FutureMINE – Callio Pyhäjärvi transforms to multi-functional and customized testing environment.

Press Release 27 Feb 2018: The world’s highest hydraulic head in the underground energy storage plant – Pyhäjärvi, Finland.

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