She knew this could only be kept from Zhao Ming temporarily, and once the iron mine was officially mined, she wouldn't be able to hide it for much longer.
Moreover, she didn't really want to hide it because after all, using wood to smelt iron consumes too much wood, and the results are not good, so she needs coal.
Fu Tinghan had already used the high furnace to smelt steel; that high furnace had been modified again and again, and now it can be confirmed.
He did not intervene in the matter further but instead handed over the construction of the high furnace and the craftsmen skilled in iron and steel smelting to Zhao Hanzhang, and then took Zhao Hanzhang's sword to the newly built high furnace.
At this time, Lu Tiejiang was sweating all over while working on iron by the high furnace.
Outside, it was bitterly cold winter, but inside it was warm; although the craftsmen found the work hard, they didn't feel unhappy.
