Read their FAQ [1]. They're using olivine, not limestone, and there's a ton of olivine in the crust. [1] https://projectvesta.org/frequently-asked-questions/ h

Read their FAQ [1]. They're using olivine, not limestone, and there's a ton of olivine in the crust. [1] https://projectvesta.org/frequently-asked-questions/ https://projectvesta.org/frequently-asked-questions/