[AstralStorm]

There's not enough limestone deposits for this to work - that aren't actually being currently mined.

You cannot use a an active mine for this technique, you have to let the stone lie and weather.

[quotemstr]

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/