Cao Shuang knew that the ocher Huan Fan mentioned should refer to hematite. The ancients discovered that when reddish-brown hematite appears above a certain place, a large iron ore will appear below.
Then he continued: "I think as long as the ocher reaches the place and reddish-brown ore is found on the ground, it can be concluded that there is no iron ore underground. However, this method will consume more manpower and material resources."
Huan Fan responded: "Yes, but in order to make the Wei Dynasty stronger, all this manpower and material resources are insignificant."
This kind of iron ore usually refers to skarn type iron ore, and my country's famous Daye Iron Mine is this type of iron ore.
During mineralization, hot and iron-rich slurry invades carbonate rocks to form iron ore.
A large amount of magnetite ore can appear in the main mineralization period, while ores such as pyrite and siderite are formed in the later process.
Of course, the ocher here, that is, hematite, may have been associated with the mineralization period, but it is more likely that various iron ores formed reddish-red iron ore due to later weathering.
In large iron mines, high-grade iron ore is exposed to the surface and is weathered to form hematite. When prospecting, ancient people used these exposed ochres to find the enriched iron ore underneath.
Magnetite is what we now call magnetite. Because the ancients discovered that magnetite can attract many ferromagnetic minerals, they thought it had maternal kindness, so they called it magnetite.
This formula often refers to porphyry copper deposits. The development of porphyry copper deposits is closely related to oxygen fugacity. In the early stage of mineralization, oxygen fugacity is suitable for the mineralization of copper and gold.
In the late stage, when the oxygen fugacity is no longer suitable for mineralization, magnetite will appear. Therefore, when magnetite appears widely, copper, gold and other minerals are likely to appear in its lower part.
The lead here mainly refers to galena, while the silver refers to natural silver or albite.
Although the natural silver mentioned here is secondary, it is often associated with argentite and occurs in the oxidation zone of lead-silver deposits.
Primary chalcite is a common mineral in medium- to low-temperature hydrothermal deposits, which also develop galena ores.
Galena and chalcocite are closely related during the mineralization process, and the two are often seen in conjunction.
The ancients also had a particularly profound understanding of this point. "Lead is the mother of silver, and silver is the essence of lead." Although the formation of the two may not promote each other, it is not difficult to see the close symbiotic relationship between the two ores.
This prospecting formula is not suitable for current prospecting. The two minerals cinnabar and natural gold usually exist in their respective primary veins, and a very small number of them may have a symbiotic relationship.
However, the ancients were not mature enough to study the mineralization of mercury and gold. The mercury mines and gold mines at that time were mainly placer deposits, so there would be placer deposits where mercury and gold coexisted. Therefore, according to this formula, we found
Mine is quite accurate.
The formula that there is lead, tin, and copper under the tombstone is not only applicable to lead-zinc-copper polymetallic deposits dominated by lead, but also to tin deposits and cuprite deposits that are symbiotic with copper, lead, and zinc.
Because these deposits are rich in sulfide, chloride and copper ions, some malachite will be formed during the supergene weathering process.
Of course, the two situations of "there is tin above the mausoleum stone" and "there is red copper below the mausoleum stone" are also experiences summed up by the ancients based on actual prospecting phenomena.
Where there is silver above, there is lead below. This motto seems to be the completely opposite conclusion to the third one, but in fact it was also widely used in ancient mining.
This relationship of silver on the top and lead on the bottom actually does not refer to the vertical distribution relationship of the two metal minerals in one ore body, but the spatial relationship between the two minerals that are present in the strata of two different eras.
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Cao Shuang casually picked up a volume of memorials and continued reading. He also thought that in addition to the lack of iron ore, the Wei Dynasty was also in short supply of copper, silver, gold and other minerals.
For example, a few years ago, my own advantageous father-in-law, Sun Quan, had a lot of copper mines in Jiangdong. The Wei Dynasty lacked copper mines, so he could let people use "Daquan Fifty" to buy supplies in the Wei Dynasty, and use a Soochow copper coin as a big
Wei's fifty five-baht coins are used,
This really troubled the Wei Dynasty for a while, and they could only return to the more primitive method of bartering to counter Soochow. Although it was a little behind, it was still very effective.
During the Jian'an period, Sun Quan looked at the map showing the distribution of copper mines in Jiangnan and fell into deep thought: Since we have so much copper, can we use them to take advantage of Cao Wei?
Zhou Yu obviously thinks so. Before Red Cliff, Zhou Yu told Sun Quan, "The copper mines in Jiangnan are the richest in the world, and the amount of coins minted is many times greater than that of Cao Cao. Why should we be afraid of Cao Cao?"
Sun Quan thought about it for a long time. Apart from casting copper mines to weigh money, going to Cao Wei to buy things, and plundering Cao Wei's wealth, he really couldn't think of any other good idea, but he was a little unwilling to do this.
Although Sun Quan did not understand the concept of inflation, he should have been vaguely aware that more money is not always better.
So Sun Quan decided to intensify his efforts to plunder Cao Wei's wealth: he decided to mint a currency called "Daquan Fifty", which weighed about the same as the five-baht coins left from the Han Dynasty, but Sun Quan stipulated that a "Daquan Fifty" currency
Ten" is worth fifty five baht coins.
In this way, we can not only rob Cao Wei of more supplies, but also destroy the monetary order of Cao Wei.
So he happily sent soldiers disguised as merchants to pull carts of Daquan fifty to Jiangbei in exchange for food and other supplies.
However, ideals are full and manifestations are cruel. Sun Quan did not realize that he was not the lord of Jiangbei, and his orders could not cross the Yangtze River.
The people of Jiangbei will obviously not admit that a Daquan fifty of the same weight can be used as fifty five-baht coins.
How much is it? One piece. But Sun Quan thinks it’s not bad, just one piece. Anyway, if I buy one more grain to the south of the Yangtze River, you will lose one grain of grain to the north of the Yangtze River.
Zhou Yu might have vaguely felt that something was wrong at the time, but he couldn't express it, so he didn't say anything.
Facts have proved that even if there is no theoretical guidance, when it comes to money, people's IQ will suddenly rise online.
The soldiers and civilians of Cao Wei in the north of the Yangtze River received Daquan fifty, and also heard about Sun Quan's regulations on the exchange ratio. They were keenly aware of a problem: we can deny this exchange ratio, but those in the south of the Yangtze River cannot deny it.
So, after the people from Jiangbei got the big spring for fifty times, they transported it to the south of the Yangtze River, where they plundered the wealth of the south of the Yangtze River at a ratio of fifty times.
Sun Quan was stupid, so he quickly stopped the casting of Daquan Fifty and ordered that once the government received Daquan Fifty, it must be recast. But even so, Sun Quan's purpose of destroying the original currency system of the Wei Dynasty was achieved.
Cao Shuang thought of this and continued to give instructions: "In addition to the lack of iron, the Wei Dynasty is also short of gold, silver, copper and other minerals. If there are these minerals nearby, they must pay attention to them. The Wei Dynasty is very short of money now.
Ever since I was forced to exchange things for things by my cheap father-in-law, I still haven't recovered yet. This is really a big weakness of my great Wei!"