I don't know why you have to "suspect," when you can read the linked papers or any others... "A life cycle assessment (LCA) about the potential of basaltic roc

I don't know why you have to "suspect," when you can read the linked papers or any others... "A life cycle assessment (LCA) about the potential of basaltic rocks for enhanced weathering and soil carbonation (Section 5.1.) found transportation (related to the distance between the quarry and the place of application) as the major process negatively affecting CO2 sequestration, whereas grinding had less effects on the CO2 budget, which could however be related to the relative coarseness (<5 mm) of the particles." A lot of companies doing this use fines or waste material, but it can still be done efficiently. One thing you seem to be missing coming from the copper world is that the ore for copper is very low percentage of copper and has a maybe 3:1 stripping ratio, so you need to mine and grind and use 300-400 tonnes to get 1 tonne of copper out. With ultramafic and mafic rocks, you can have huge continuous bodies of these minerals, with very high usage and efficient ratio. One tonne of olivine removes more than 1 tonne of resultant carbon based on its Mg cation content. Transport is electrifying and so is the grid that powers those vehicles, therefore in the long run you can assume these will become more and more efficient. Potential and costs of carbon dioxide removal by enhanced weathering of rocks https://iopscience.iop.org/article/10.1088/1748-9326/aaa9c4 https://iopscience.iop.org/article/10.1088/1748-9326/aaa9c4 Environmental life cycle assessment of CO2 sequestration through enhanced weathering of olivine https://legacy.projectvesta.org/wp-content/uploads/2019/06/Environmental-life-cycle-assessment-of-CO2-sequestration-through-enhanced-weathering-of-olivine.pdf https://legacy.projectvesta.org/wp-content/uploads/2019/06/E...