The maximum level of the Rock world mine should be increased to 128

In the late game, when there is a need to develop a large sea area, there are huge difficulties when trying to expand the output of Rock from the mine, although I have enough construction resources, expanding capacity through research is limited by the production complex, since its expansion requires area, accelerating the mine through officials requires population, and for them, a sowing area is required, digging holes to obtain rocks also requires a place to dig them, and also requires a transport limit that has already been exhausted, it turns out that the only way out is to just wait, but the maximum speed of the game is meager

I do not think you can make enough unity to supply this level of mine. But you can always make compost and dump it - it will turn into dirt. I think that easiest way is to trade wood for corn, turn it into animal feed and that into a compost. 1 unit of wood turns into 2.1 units of dirt this way (not counting with focus bonus).