Chen Jingke took out a few pages from his sleeve and said: "It's already written. Not only the method of drying salt, but also several places that are more suitable for drying salt."

In previous lives, China had three major salt fields, four major salt fields, seven major salt fields, etc. There are different opinions, but there are three places that are most suitable for drying salt.

One is Laizhou, Shandong, which is the largest industrial salt production base in China. The other is the Butai Salt Field on Taiwan Island, which is the largest salt production base in China. The other is the Yinggehai Salt Field on Hainan Island.

Speaking of Hainan Island, Chen Jingke remembered another thing and said: "There is a large-scale open-pit iron mine on this island, with iron ore reserves of more than 300 million tons."

There was no unit ton in the Tang Dynasty, but Chen Jingke often used the word ton, and people familiar with him basically knew what it meant.

One ton is two thousand kilograms, three hundred million tons is six hundred billion kilograms of iron ore... Changsun Wugu was tempted just by hearing this number.

Before the Tang Dynasty, the steel production was only about 500 tons. New steelmaking technology was obtained from Chen Jingke, and the trial results in several iron mines were remarkable.

According to estimates from the Ministry of Industry, Datang's iron production this year will exceed about 2,000 tons.

Nowadays, steel production is completely limited by ore mining. If there is an open-pit iron mine and new steel-making technology, Datang's steel production can be doubled several times.

With more iron, more weapons and armor can be made, which improves the combat effectiveness of the army. More agricultural tools can be made, and with enough agricultural tools, more land can be cultivated and more people can be fed.

In short, iron is too important, it is a symbol of strength.

Chen Jingke continued: "The grade of this iron ore is very high, generally exceeding 50%, with the highest being 70%. It is easy to mine and refine."

"Moreover, this iron mine is also accompanied by a large copper mine and a gold mine. As long as they are mined, many problems of the imperial court can be solved."

"As for the miners...there are many native people on the Nanyang Islands, and those who don't accept the king's rule are all taken over to mine."

"Wait, wait." Changsun Wugou stroked his forehead and said, "You talk too much and I'm a little confused."

"You just said that there is a place called Yinggehai in Yazhou that is suitable for drying salt, and there is also a large open-pit iron mine with associated copper and gold mines, right?"

－－－－－－Digression－－－－－

"At the beginning of the civil fort, the Ming God of War was a little panicked" Recommended words: The counterattack of the Ming God of War Zhu Qizhen!
Chapter completed!