"Don't worry, little brother. Listen to me. This is a rare natural iron ore vein! This iron is mainly used to make weapons such as swords and is not easy to rust, and the iron sword is extremely sharp, known as "blowing hair and wind"! And mining in the vein is several times more likely than mining in the ordinary vein! But even if it is mined in the ore vein, the output is extremely rare. The proportion is: 8:2, that is, only 2% of the iron can be extracted from a kilogram of iron! And even one percent of the common iron ore is hard to extract! So this...