Brewing Up Innovation: Made-in-BC Device Boosts Exploration for Critical Minerals

Vancouver, BC – June 14, 2022 – A new Geoscience BC report shows how a small, made-in-British-Columbia device that uses sensors typically found in breweries and greenhouses can be used to boost exploration for critical minerals, following testing at the Mount Milligan Mine located between Fort St. James and Mackenzie.

The device measures oxygen and carbon dioxide concentrations in soil (‘soil-gas’) in real time, which can indicate the presence of geological faults and sulphide mineralization. Soil gas testing can help geologists to identify potential mineral deposits when this mineralization is buried beneath sediments such as glacial deposits, and the new device saves the need to send gas samples to laboratories for analysis.

BC Geological Survey Emeritus Scientist and lead report author Ray Lett designed the device. He said: “The results from Mount Milligan Mine are very encouraging. The correlation of carbon dioxide and oxygen anomalies with observed fractures and potentially mineralized faults, combined with the ability to give reliable, real-time data demonstrates a tangible benefit to the mineral exploration sector. The soil gas measurement system also has potential applications in other areas, such as geothermal or seismicity detection, where the measurement of soil gases would be of benefit.”

Geoscience BC Vice President, Minerals Christa Pellett said: "This research demonstrates an innovative and cost-effective technique to support exploration for critical minerals in areas of BC and beyond that may host undiscovered mineral deposits.”

The new report provides an update to a 2020 project, which was extended so that the research team could refine the operability and accuracy of the prototype device and further test the system at the Mount Milligan Mine. Centerra Gold Inc., which operates the Mount Milligan Mine, provided the research team with bedrock and surficial geology data to allow the correlation of soil gas measurements with known bedrock structures and mineralization. Centerra Gold Inc. also trenched the project area allowing for direct field observations of the bedrock. Collectively these techniques gave a higher level of confidence in the project results.

Results from Mount Milligan Mine show a correlation between carbon dioxide and oxygen concentrations in the soil above geological structures and mineralization. These results provide a framework for using real-time soil gas measurements to support mineral exploration in areas where bedrock is covered by sediment.

Accessing Information

To view the reports, data and maps, visit the project page or view the information on Geoscience BC's Earth Science Viewer online mapping application.

Geoscience BC Membership

Geoscience BC’s Corporate, Individual, Student and Associate membership make it easier for a wide range of partners to provide more input on, and benefit from, Geoscience BC research priorities and project ideas as the transition to a lower carbon economy increases demand for British Columbia’s natural resources.

About Geoscience BC

Geoscience BC generates independent, public geoscience research and data about British Columbia’s minerals, energy and water resources. This advances knowledge, informs responsible development, encourages investment and stimulates innovation.

Our collaboration with the resource sectors, academia, communities, Indigenous groups and government develops and shares unbiased and credible earth science research and data. Geoscience BC is a not-for-profit society incorporated under the BC Societies Act. Visit or follow us @GeoscienceBC to find out more and join Geoscience BC as a member.

For more information, please contact:

Richard Truman Geoscience BC 604-662-4147 / 778-929-1662