Yes, further details would be very illuminating !

Sibelco's Aheim mine essentially supplies a large part of the world's olivine today. It is located in a Fjord with its own port. The transportation distance is very small.

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...