The device uses sensors to test soil gases, the levels of which may indicate deeply buried mineral deposits. | Palmer
A simple device that measures CO2 and oxygen in the soil could help geologists concentrate on valuable but deeply buried mineral deposits, according to new research from Geoscience BC.
Research has shown that soil gases that are high in CO2 and low in oxygen are indicators of oxidizing sulfides in the bedrock, an indication of mineralization.
Soil gas testing can be useful for geologists when a potential mineral deposit is buried beneath sediments and glacial deposits, according to a new report from Geoscience BC, which conducted field tests using a simple device developed by a scientist from Geological Survey of Canada.
“Abnormal concentrations in these gases are thought to indicate the presence of hidden mineralized faults beneath glacial sediments,” the report states.
The device uses the same types of sensors that are used in breweries and greenhouses to detect CO2 and oxygen levels, and has been adapted to test soils in the field. The device has been tested at the Mount Milligan mine in BC
“The results of the Mount Milligan mine are very encouraging,” said Ray Lett, a scientist emeritus from the Geological Survey of Canada who developed the device and is the lead author of the recent study.
“The correlation of carbon dioxide and oxygen anomalies with observed fractures and potentially mineralized faults, combined with the ability to provide reliable real-time data, demonstrates a tangible benefit to the mineral exploration industry.”
“Soil gas testing can help geologists identify potential mineral deposits when this mineralization is buried under sediments such as glacial deposits, and the new device saves the need to send gas samples to laboratories for analysis.” says GeoscienceBC.
“This research demonstrates an innovative and cost-effective technique to support the exploration of critical minerals in BC areas and beyond that may harbor undiscovered mineral deposits,” said Geoscience BC Vice President of Minerals Christa Pellett.
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