Well, yes, a lot of farmers (not all, probably most) are interested on adding those to their soil and will do it if it's cheap enough.
I'm not sure we can mine, pulverize, and distribute it in a carbon-negative way. But yeah, coupled with large scale implantation of renewables and decarbonization of transportation, it may be enough to even roll climate change back a little bit.
For basalt, it's around 200kg net, so the supply chains have to be shorter.
I checked my math with the DOE's experts, and it checks out.
See their website here: https://www.sibelco.com/en/150-years/aheim
"The proximity of Aheim’s mine, processing facility and shipping terminal enables Sibelco to run a highly efficient operation with minimal transport or double-handling of materials. Quarried olivine is moved via conveyor belt through a 4km tunnel to the processing plant where it is crushed, dried and screened into different grades."
When transporting mostly by ship, olivine ERW efficiency can remain >90% even with 1000+ kilometers of sea transit.
See this working paper: Environmental life cycle assessment of CO2 sequestration through enhanced weathering of olivine https://legacy.projectvesta.org/wp-content/uploads/2019/06/E...