Project Update Webinar: Initial Results from Carbon Mineralization Potential for BC Project – November 2020

Geoscience BC hosted a webinar on November 3, 2020 to discuss initial results from this minerals research project assessing the potential for rocks in British Columbia to capture and store the greenhouse gas carbon dioxide (CO₂).

The Need

Both Canada and BC have challenging climate targets. In BC, the CleanBC plan identifies a need to put in place a regulatory framework for carbon capture and storage methods.

This project is building on a decade of ongoing research examining the natural reaction between magnesium-rich minerals in serpentinized ultramafic rock (serpentinite rocks) and atmospheric CO₂, while finding ways to accelerate the reaction.

CO₂ binds with the magnesium minerals in ultramafic rocks. These magnesium minerals are particularly abundant in serpentinite rocks. Serpentinite rocks can also host nickel deposits, so crushed serpentinite rock is found in mine tailings (waste rock) at some nickel mines.

Identifying the distribution, abundances, geometries and quality of these serpentinized ultramafic bodies in BC is the first step towards quantifying the opportunity to use them to reduce atmospheric CO₂.

Goals

This Minerals project fits under our Strategic Objective of Advancing Science & Innovative Geoscience Technologies, and our goal to:

• Increase research and development of innovative exploration and mining methods, tools, approaches and geoscience technologies.

The goal of the Carbon Mineralization Potential Assessment for BC project is to produce an inventory of ultramafic rock localities in BC that includes both their mineralization potential as well as abundance estimates.

Specifically, the project is:

1. Determining the mineralogical and physical characteristics of localities with high carbon mineralization potential throughout BC;
2. Determining the distribution of ultramafic rocks throughout BC using existing geophysical and geological data sets;
3. Establishing the 3D geometry of ultramafic bodies for key sites to indicate potential resource size, quality and potential extraction; and
4. Establishing a BC Carbon Mineralization Potential index by integrating the project results and other publicly available datasets.

Benefits

The ability to capture and store atmospheric CO₂ using this naturally occurring material could provide environmental and economic benefits.

This project could identify how companies mining ultramafic rocks could use what was previously considered as waste to capture CO₂ from the mining operation, as well as potentially capturing additional CO₂ from the atmosphere.

Graph of carbon capture from air with mine tailings (black line). Credit: UBC – BRIMM

Simulated mineralization of powerplant exhaust CO₂ in laboratory experiments. Credit: Eric Wynands (UBC)

Example of mineralized atmospheric carbon in tailings at Clinton Creek Mine, Yukon. Credit: UBC – BRIMM

Survey Area

Province-wide. View in Earth Science Viewer

What Was Found?

The following is a summary of the findings in the first of two reports for this project, published on November 3, 2020.

The researchers found that approximately 75% of the ultramafic rock bodies in BC are associated with large magnetic anomalies that suggest extensive serpentinization, and created geophysical models to estimate the volume of these rock bodies below the surface.

The volume of serpentinites in the upper kilometre of the crust is estimated to be more than 1,000 km³. The readily extractable magnesium content of these rocks is estimated to have a carbon sequestration capacity of more than 56 Gt of CO₂, representing more than 800 years of GHG emissions for BC at current rates.