I plan to build a SAG mill shortly (after all I need to power something with all this Hootch my MFR tree farm has produced by way of apples), but for Silicon I just go to a Mesa biome, gather an inventory full of hardened clay, macerate it, and run the clay dust through electrolyzer. All the Lithium and Silicon I need right there.Man I wish I'd discovered the SAG mil so much earlier. Silicon's been killing me, mostly because I was getting it as a byproduct of using the entire GT macerate/ore wash/thermal centrifuge/hammer/centrifuge-electrolyzer method.