> The chemistry, however, is sound that each 1 ton of olivine will sequester 1.25 tons of carbon.
But what's the total CO2 cost of the olivine (extraction, processing and transport to the sea) ?
But what's the total CO2 cost of the olivine (extraction, processing and transport to the sea) ?
We are not planning to do any new mining for the first allotments of olivine though, as there are literally "tons" of piles of olivine-rich rock sitting as "tailings" on the property of old mines.
This already excavated rock was mined in the pursuit of the mineral deposits below it and are considered "waste" by these mines. Kind of like buying a used car instead of having a new one created, that rock's CO2 is already accounted for. So, in this case, we do not have to mine it, only transport (ideally in an efficient manner like a train) and then mill it and spread it on the beach.