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Mao Geng heard that the place where 6 Jiuyuan gave a lecture was in Guixi, and he was impulsive, almost wanting to mobilize 6 Jiuyuan to mine that large silver mine, even if 6 Jiuyuan couldn't go back to preside over the financial business of opening the mine, at least his disciples could do it on his behalf!

Speaking of Guixi silver-lead-zinc mine, it is said that the silver alone has a reserve of 10,000 tons, what is the concept of 10,000 tons? Song Jin is 64o grams, one tael is 4o grams, 10,000 tons of silver, that is, 250 million taels, no matter what you do, it is impossible to dig up ready-made silver and get rich quickly! Wouldn't it be good to let a generation of great Confucians and moral masters get rich first! Hey! If 6 Xiangshan gets rich first, in addition to maximizing social benefits, the news value is also extraordinary.

But then Mao Geng dispelled this idea, think about the late Guixi silver-lead-zinc mine, although the reserves of silver, lead and zinc are very amazing, but that is the mid-to-late eighties to discover the mineral deposits, it is said that the exploration is quite difficult, it is said that this has to be buried in the ground, it will take decades to explore! Even if the 6 Jiuyuan Movement disciples found this mine, I am afraid that it would be difficult to dig out the ore.

I didn't come to Da Song Keng, besides, it's good for anyone to pit it, and you can't pit the respectable 6 Jiuyuan.

Wait! We have a lot of land and resources, and there are more mineral resources that are easy to mine, isn't it copper and zinc!

As a small shareholder who once held Jiangtong shares with perseverance, Mao Geng certainly knows that Dexing Copper Mine and Yongping Copper Mine are both open-pit copper mines, that is to say, the copper mine is buried very shallowly, so shallow that the upper layer can be open-pit mined, as long as the vein is found, there is no worry about not digging out. Well, it is the copper mines in these two places that are more valuable to mine in this era!

As for zinc ore, there is no need to worry at all, since the Great Song Dynasty has a large lead field, there will be no shortage of zinc ore, and the doctrine is faster than their own original or new digging, according to the view of later generations, the interests of resources can be doubled back in deep processing. Occupying the highest end of the industry is the key to success, and this is the truth!

Mao Geng turned back and forth many times in his heart, and finally felt that the disciple resources of 6 Jiuyuan did not need to be used in vain, rather than letting his disciples have an epiphany every day, they were idle, it was better to ------

"Mr. Xiangshan, I heard that there are no less than thousands of disciples who have listened to Mr. Xiangshan's lectures in Xiangshan, and there are not a few disciples of Mr. Xiangshan himself, Mr. Xiangshan pays attention to both epiphany and physical behavior, I want to give those disciples of Mr. Xiangshan a chance to create a physical line, I wonder if Mr. Xiangshan will mind?"

"I don't know what Mao Te wants 6 a disciple to work for?"

"I said Mao Geng, why did you take a while in Jinxi and a while in Guixi, and now suddenly it is on Mr. Xiangshan's disciples! I see that you have always been rigorous, there are not many times to go off topic, today's topic was originally a copper coin war, how to pull and pull it will be thousands of miles away! ”

Zhao Luan was anxious to do a good job of the topic handed over by the emperor's grandfather immediately, Mao Geng brought himself to see the zinc, Zhao Luan admitted, it was at least related to copper, but suddenly it was on the disciple of 6 Jiuyuan, Zhao Luan couldn't help but be anxious to pull Mao Geng back to the original track.

Mao Geng realized that the prince in front of him was serious about solving the problem today, presumably it was the pressure from Lin'an!

"Guogong, the excitement is still to come, let's go, let's go and see that side again."

The three of them walked to a place, only to see an iron trough resting on the fire, the gray-white liquid in the trough was boiling, and the hot gas was lingering on the trough, Mao Geng handed over two masks, and then demonstrated, and asked Zhao Lian and 6 Jiuyuan to wear masks as well. There is lead in the tank, and the lead vapor is toxic, so of course you should take precautions.

Mao Geng explained, Fugui took an iron bar, Mao Geng showed the iron bar to Zhao Lu and 6 Jiuyuan, and when the two confirmed that it was an iron bar, Mao Geng threw the iron bar into the liquid, only exposing a part of the tail outside the trough.

"It's nothing else, it's a liquid that melts zinc. Wait a moment and take it out, and you'll see. ”

After less than a minute, Fugui scooped up the iron bar, and the section inserted into the groove had turned a silvery-white color, which was completely different from the exposed tail section.

After cooling, Mao Geng let the two of them touch it again, feeling that this layer of silver-white things is like being born on an iron bar, well, it seems to be like a layer of silver-white paint, no matter how you touch, how to pinch, how to rub, the silver-white coating will not fall off at all, and 6 Jiuyuan, who is used to seeing the paint off, began to feel magical.

"It's called hot-dip galvanizing." Zinc also has the function of electrochemical anti-rust, galvanizing is very common in later generations, and the melting point of zinc is low, even if later generations can choose electroplating, hot-dip galvanizing still occupies an overwhelming position.

Mao Geng took the two of them out of this leaded environment, and then gave each of them a hot-dip galvanized disc, while explaining:

"This thing is also coated with a layer of zinc on the iron, and after galvanizing, it will not rust for many years."

"Is it really that amazing?"

In Zhao Lu's concept, as long as it is iron, it can't run away if it's rusty, and if it doesn't rust, it can only be said to be a miracle.

"Yes, exactly."

Mao Geng replied very affirmatively, the iron tools of the heart are really weak in these years, and the iron money cast by the Great Song Dynasty is even more uncontrollable, the iron money is cast thick and heavy, and it is rusted to a mess at every turn, and the people are unwilling to use iron money, which is really reasonable.

6 Jiuyuan rubbed the silver-white metal object in his hand, only felt heavy, smoother and brighter than ordinary iron, if he had not seen the scene of hot-dip galvanizing beforehand, he really couldn't believe that this was the product of iron galvanizing in his hand. It is only because he has seen the demonstration and seen it with his own eyes that he will not doubt what Mao Geng said.

"I witnessed a hot-dip galvanizing today, which opened the eyes of 6. It turns out that this zinc is so magical! ”

Of course, hot-dip galvanizing is magical, and later generations don't know how many galvanized pipes and galvanized sheets are coming off the production line in a steady stream, if you talk about their output, you will definitely be dumbfounded.

People say that a trick is eaten all over the world, and hot-dip galvanizing is naturally a very fresh trick at the moment, and this trick has to be hidden. So, Mao Geng smiled:

"Mr. Xiangshan, it is precisely because this zinc is indeed miraculous, so it is necessary to keep the secret, if the Jin people learn the secret of zinc, wouldn't it be bad! You're right? ”

"Yes, you can't let Jin Ren learn."

Zhao Yan agreed very strictly.

"So, I thought, let Mr. Xiangshan choose some disciples to learn the secret of zinc smelting, the secret of zinc smelting, before this I only taught the Fu family, but after all, the Fu family does not produce much zinc, can not fully guarantee the supply of zinc, there must be other people to smelt zinc together." Come to think of it, Mr. Xiangshan's disciples should be trustworthy, and if they learn this secret skill, they don't have to worry about leaking it out at all. And after they learned the secret technique of zinc smelting, it is not difficult to find zinc ore in Jiangxi, presumably with their participation, we will never be short of zinc again. I just don't know what Mr. Xiangshan thinks? ”

6 Xiangshan talks about conscience, attaches importance to moral education, and the disciples can be said to have both ability and political integrity, if such a group of people are not credible, who else can they trust! Zhao Lian also nodded on the side, feeling that it was a temporary choice.

6 Jiuyuan opened the curtains, looked north, and then turned back and said:

"6 A certain disciple is to spare his life for national affairs, thanks to Mao Te's refusal to give up, so much value 6's disciple, 6 can live up to the good intentions of Brother Mao! In this way, Fu Ziyun who came with me will count one first, and I will think about it again, and see who else can take on this role among the disciples, in short, as long as Brother Mao is willing to teach, 6 A group of disciples to learn zinc refining should be no problem. ”

"It couldn't be better."

6 The disciples of Jiuyuan are all intelligent and cultured people, their qualifications are impeccable, it should not be difficult to learn a simple trick of zinc smelting, and in terms of secrecy, there is no need to doubt it. Mao Geng was overjoyed, and Zhao Lu was also overjoyed.

Then Mao Geng talked about his understanding of money:

"Metal currency, there is a principle first, that is, base metals must be used as raw materials, in the Han Dynasty and the early Tang Dynasty, copper is still a base metal, and it is of course good to use copper coins. But in this dynasty, if the copper material in the first few decades of the dynasty was still a base metal, in the Shenzong period, the copper material was expensive, and the copper coin was close to a loss, if it was not for the imperial court to forcibly lower the price of copper, in essence, the copper coin was already in a state of loss. ”

"Since there is a risk of losing money, the method of copper smelting in bile water arose at this time, and the method of bile copper greatly reduced the cost of copper smelting, which made the minting of copper coins barely equal. However, after the southern crossing, the price of goods soared, and the price of copper also rose, although the imperial court forcibly insisted on collecting copper at a low price, and the minting of copper coins was essentially a loss. Nowadays, the price of copper, hehe, I mean the market price, or the black market price, is obviously several times higher than the price of copper purchased by the imperial court, and today's copper is no longer a base metal in any case. ”

The Great Song Dynasty copper material was banned, which belonged to the government's monopoly of the copper industry, and to put it bluntly, it was the same thing as the unified purchase and sales of later generations, and the unified purchase and sales often covered up the imbalance between supply and demand, and also covered up the price imbalance.

Speaking of which, 6 Jiuyuan interjected:

"In fact, since the fifth generation, in the casting of iron money, iron is cheaper than copper, not suffering from its material is more expensive than the value of money, but the iron money is too heavy, the heaviest consistent iron money in Sichuan, there are twenty-five catties, the transaction is extremely inconvenient. Second, it is very easy to rust, and after a long time, the money has no money, and the people do not like iron money, because the iron money is rough and heavy. ”

Mao Geng smiled:

Mr. Xiangshan got to the point. Since copper can no longer be called a base metal, it is inevitable to use iron that is cheaper than copper to make coins. ”

Speaking of this, Mao Geng couldn't help but think of the fifth set of RMB coins in later generations, the silver coin in one corner is an aluminum coin at a glance, the five-corner one looks like copper, but it is actually a steel core copper plated, and the one-yuan coin looks like stainless steel, but it is actually a steel core nickel plated. In later generations, the price of copper rose sharply (from a minimum of 15oo US dollars / ton in six years to 88oo US dollars / ton in O8 years), and the price of stainless steel also rose sharply. So the central bank did not hesitate to choose base metals as the core material, just to make the appearance look like it was made of precious materials.

With such a mystery, there is no need for Mao Geng to hide it:

"However, to make money out of iron, you have to pay attention to it. At least it should be made more delicately, at least not rusty. If I were to make iron coins, the method of casting would have to be abandoned, and the method of stamping would have to be used, and it would have been necessary to coat the iron coins with a layer of zinc. ”

The countermeasures of the central bank in later generations are also applicable to the Great Song Dynasty - the price of copper has risen sharply, so we will use iron, but at least we must be able to get by on the face, right!

Of course, iron money is only one of the parts.