Chapter 114: This part is omitted and cannot be included in the novel.

After a simple weighing, just over ten tons of black iron sand yielded more than two thousand jin of low-grade pig iron, over two hundred jin of pure iron, and about one hundred and thirty or forty jin of tamahagane, with a conversion rate of around 12%.

And that's not the end of the losses—these two thousand-plus jin of pig iron can't be used directly, and need to be laboriously forged into wrought iron by hand. If it's for making ordinary household tools, there's still about 30% more lost in the process; but if you want to make armor, you'll need at least another five rounds of forging—and by then, you're lucky to get three jin of usable iron from ten jin of raw pig iron.

Likewise, the tamahagane has to be cooled and quenched before use, then separated into soft steel and hard steel, with several dozen jin lost in the process as well.