About us


Sialtech and Geosonic France are internationally recognized as leading fieldwork companies, with decades of experience providing expert drilling and sampling services both onshore and offshore. We have successfully completed a diverse range of projects across Europe, including geotechnical drillings in the heart of Amsterdam and Paris, water sediment surveys in the bustling ports of Rotterdam and the North Sea, and archaeological and environmental research in locations such as Antwerp and Sweden. Additionally, we have carried out drilling and sampling projects in mines at depths of up to 600 meters and core drillings up to 1000 meters, as well as on nuclear sites under the most stringent safety measures.

At Sialtech and Geosonic France, safety and quality are always our top priorities. We strictly adhere to rigorous safety protocols and use the latest equipment and technology to ensure that our work is conducted with maximum precision and care. Our experienced team of professionals is dedicated to providing reliable and accurate results, no matter how complex or challenging the project may be.

We recognize that every project is unique, and we work closely with our clients to understand their specific needs and requirements. Whether we are working on a small-scale local project or a large-scale international operation, we are committed to delivering the highest standards of quality and service. Our team is equipped with the latest scientific techniques and technologies to provide our clients with the most comprehensive and reliable data possible.

At Sialtech and Geosonic France, we take pride in our reputation as industry leaders in fieldwork. Our team is passionate about using the latest scientific techniques and technologies to provide our clients with exceptional results. By working with us, clients can be confident that their projects are in the hands of experienced professionals who are committed to delivering the highest standards of quality, safety, and service.

Fieldwork specialist

Effective soil research requires a strong and reliable link between fieldwork and laboratory analysis. At Geosonic France and Sialtech, we understand the critical role that high-quality soil sampling plays in generating accurate data and insights. We have developed our expertise in this area over many years and have become a leading choice for companies seeking specialized fieldwork services.

Our focus on providing comprehensive and reliable soil sampling services means that we are equipped to handle the complex demands of this work. From drilling to sampling, we are committed to delivering the highest standards of quality and accuracy. This has helped us to build a reputation for excellence in the industry and to earn the trust of our clients.

We recognize that our work in the field must be supported by strong partnerships with certified laboratories in order to ensure that our research is conducted with maximum rigor and reliability. As such, we work closely with our laboratory partners to ensure that our research is reproducible and meets the highest standards of quality.

At Geosonic France and Sialtech, we are committed to providing our clients with the highest level of service and expertise. By working with us, companies can be confident that their soil research is in the hands of experienced professionals who are dedicated to delivering reliable and accurate results.

Sialtech and Geosonic France

The business cooperation between Sialtech and Geosonic France is a great example of cross-border collaboration within Europe. Despite being based in different parts of Europe, their partnership shows that businesses can work together effectively across borders to achieve shared goals.

By joining forces, Sialtech and Geosonic France can combine their respective strengths and expertise to deliver better services and solutions to their clients. This kind of cooperation not only benefits the companies involved but also contributes to the growth and prosperity of the wider European community.

Overall, the partnership between Sialtech and Geosonic France serves as a positive example of the spirit of collaboration and cooperation that exists within Europe, and the potential for businesses to work together across borders to drive innovation and progress.

It’s fair to say that soil science is at the core of Geosonic France and Sialtech’s DNA. Our dedication to constant development and innovation is a fundamental part of our company culture. We pride ourselves on having some of the most experienced employees in the industry, who are committed to using their knowledge and expertise to deliver high-quality drilling and soil sampling services across Europe.

Over the years, we have successfully completed numerous projects across a wide range of countries, including Belgium, France, Luxembourg, Spain, Portugal, Germany, Poland, Romania, Turkey, Denmark, Norway, and Sweden. Our extensive experience in different regions and soil types allows us to provide tailored solutions that meet the specific needs and requirements of each project.

At Geosonic France and Sialtech, we are passionate about using the latest technology and scientific methods to provide accurate and reliable soil data to our clients. We believe that our commitment to excellence and our collaborative approach are key to our success, and we look forward to continuing to drive innovation and progress in the soil science industry.



Sialtech was founded in 1992 by two physical geographers, Marijn Rang and Chrit Schouten. In 1999, Henk Nijmeijers joined the company, eventually becoming its current owner. Under Nijmeijers’ leadership, Sialtech expanded significantly, beginning with the acquisition of the fieldwork team of the consultancy and engineering firm DHV in 2001, followed by the fieldwork team of the consultancy firm Chemielinco in 2003.

In 2011, Nijmeijers took over as the sole owner of Sialtech, which continued to operate as an independent company. Since then, Sialtech has become a leader in drilling and sampling. In 2021, Sialtech joined the ABO Group as an independent drilling company within the group


Geosonic France has an interesting history, which began in 2001 as the European branch of ProSonic, a US-based company specializing in sonic drilling. However, in 2003, ProSonic was acquired by Board Longyear, also a US company. But in 2005, Board Longyear decided to discontinue its European operations. The then manager of the European branch, Bernard Lacroute, continued independently and founded ForaSonic.

In 2013, ForaSonic was acquired by Geosonic, a UK-based company that was also a former branch of Board Longyear. After the acquisition, ForaSonic was renamed to Geosonic France. In 2018, Geosonic France expanded its drilling capabilities by acquiring Cofor, a company specializing in core drilling.

Today, Geosonic France is part of the ABO Group, a leading player in the drilling and geotechnical engineering industry. With this integration, Geosonic France has access to a broader range of expertise, resources, and technology, enabling it to deliver even better services to its clients.



Vleugelboot 61

3991 CM Houten

The Netherlands

Tel. +31(0)30 659 40 60

Email: info@sialtech.nl

91 Rte de Berardier

38200 Jardin


Tel. +33 (0)6 26280347

Email: jcsparfel@geosonicfrance.fr


Branche office Assen, The Netherlands

Branche office Sittard, The Netherlands

Branche office Kapelle, The Netherlands

Branche office Uppsala, Sweden