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I made the first part of Mekanism's ore processing system yesterday, Dissolution, Washing and Crystallising, including all the gas production needed for that yesterday.
It was quite the grind, because my modpack makes every metal ore yield only one nugget instead of an ingot, unless you use the ore processing systems of several mods to your advantage.
It was my first time building this system and I liked it quite a lot. Now I'll have to somehow collect enough Osmium to get my Brine production going.
And finally, there is the Technnomancy ore multiplying, which costs an impossible amount of Ignis, Mana and Blood.