Maybe One Day Advanced Plot idea. Wood Ash Cement.

[Lancars]

I direct your attention to this video. Watch it if you want to understand otherwise i will try to explain.

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The plot can be an evolution of the coal pit. It can generate concrete over time or if you have spare coal and clay from the excavator you can make some yourself from the plot like how you can put coal in the water purification and get some ultra pure water on demand.