It’s a pure odds weight; and an approximation of the processing chances.
If you get (about 36 whole) Crushed ores, sluice them, and then centrifuge it all, on average you will have x tiny Refined Ore of each thing per 528 Tiny Refined ores total (as material amount, since smelting transform is included by default).
Bedrock veins have massive numbers as they include the 1:32 chance of getting any byproduct raw ore instead, thus Tiny Refined Ore per about 108 thousand whole Crushed ores (ten or eleven IRL hours well powered on a good spot).
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