Copper cannot be obtained through cobblestone, which results in absurdly low rates resulting from needing to sift copper at a low rate (~24% combined) from granite/diorite, themselves which need to be sifted from dirt (~0.15 of a block from each block of dirt), resulting in a prolonged grind to basic automation.

@Dat-Guy I apologize for there being no Questbook or smth yet, but you can let witchwater float to lava and it will generate you randomly granite, diorite, stone and andesite.