Prospects for CO2 mineralization and enhanced weathering of ultramafic mine tailings from the Baptiste nickel deposit in British Columbia, Canada

Le potentiel du stockage géologique du CO 2 par minéralisation

“…Le processus de minéralisation du CO 2 peut également s'appliquer dans d'autres situations, notamment en surface : actuellement, des équipes travaillent sur la carbonatation ex-situ de matières mafiques disponibles en surface, comme les résidus miniers (Power et al, 2020), l'olivine 9 ou même du béton 10 . Ces approches devraient pouvoir offrir des possibilités de stockage au niveau local et à des coûts attractifs mais à plus petite échelle (Snaebjörnsdóttir et al, 2020).…”

Global Carbon Dioxide Removal Potential of Waste Materials From Metal and Diamond Mining

“…Solutions to improve the efficacy of weathering of mine wastes take two forms: (a) approaches to increase W r , and (b) engineering techniques that maximise the exposure of waste materials to the atmosphere or reacting agents. Reaction kinetics can be accelerated through reaction with CO 2 -rich fluids and gases (Huntzinger et al, 2009;Harrison et al, 2013;Marieni et al, 2020), addition of water and heat (Martinez et al, 2000;Zevenhoven and Kohlmann, 2001), the addition of organic and inorganic acids (Azdarpour et al, 2015;McCutcheon et al, 2015McCutcheon et al, , 2016McCutcheon et al, , 2017Power et al, 2016;Li et al, 2018), and techniques exploiting microbial metabolisms (Salek et al, 2013;Power et al, 2015, Power et al, 2020 that push local reaction environments away from the slowest near pH neutral conditions. For example, carbon capture rates of brucitecontaining Ni sulphide tailings were increased 5-fold by aerating tailings with 10% CO 2 gas (Power et al, 2020), with a ∼2400-fold acceleration for pure CO 2 (Harrison et al, 2013).…”

Deducing Mineralogy of Serpentinized and Carbonated Ultramafic Rocks Using Physical Properties With Implications for Carbon Sequestration and Subduction Zone Dynamics

“…Mineral carbonation may be achieved using either ex situ or in situ techniques; the former involves exposure of fine-grained material, such as mine tailings, to either atmospheric CO 2 or from a concentrated source, whereas the latter involves injecting CO 2 to a depth of >2 km. Ex situ techniques take advantage of the increased reactive surface area of tailings and the high reactivity of minerals such as brucite (e.g., Power et al, 2013Power et al, , 2018Power et al, , 2020Vanderzee et al, 2019), whereas in situ techniques exploit the elevated temperatures and pressures at depth to accelerate reactions and fully carbonate the rock (e.g., Kelemen & Matter, 2009;Kelemen et al, 2018). As resource extraction invariably requires the consumption of energy and emission of CO 2 , whether it be for transportation of materials and personnel or for ore processing/extraction, any deposit hosted in ultramafic rocks should explore their potential to sequester CO 2 and so offset or prevent emissions and promote an environmentally sustainable mining industry (e.g., Hamilton et al, 2020;Power et al, 2013Power et al, , 2018Power et al, , 2020Wilson et al, 2014).…”

“…Highly serpentinized ultramafic rocks are particularly susceptible to carbonation by CO 2 -bearing fluids and follow three simplified reactions (e.g., Hansen et al, 2005): Carbonation is also commonly considered to behave isochemically with respect to the major-element cations (Falk & Kelemen, 2015;Hansen et al, 2005;Menzel et al, 2018), resulting primarily in the formation of (hydro-)magnesite (e.g., Hansen et al, 2005), except for at high degrees of alteration in which some Ca may be added to the system (e.g., Bideau et al, 1991;Falk & Kelemen, 2015). These carbonation reactions serve as a proxy for the reactions that are commonly used in experimental carbon sequestration models (e.g., Power et al, 2020).…”