After hearing this, Liu Tan's eyes lit up and he immediately put aside the matter of the Xi'an Yang County Magistrate. If there was no other way, he would let his brother, the Crown Prince, choose an obedient one.

Nothing is more useful now than coal mines.

Liu Tan asked Wei Buyi to bring the rock over. After a careful look, he found that most of the stone was red, and a small part was... black!

Liu Tan hadn't thought they'd find a coal mine so quickly. He immediately jumped up and said, "Hurry, hurry, get someone to bring a brazier!"

Brazier?

Sang Qian was a little puzzled. There hasn't been anything that requires jumping over a fire pot recently, right?

Is he worried about the Xi'anyang County Magistrate? But the Magistrate has been dead for several days, is he worried about the seventh day?

Just as Sang Qian's imagination began to wander, he saw someone bringing a brazier. Liu Tan had someone chisel the stone into pieces, picked out the darkest pieces and threw them directly into the brazier.

Everyone: ???

Is your Highness alright? Why are you burning the stones?

Liu Tan ignored everyone else and just squatted there, observing the brazier carefully.

When Huo Guang came over, he saw a group of people gathered around a brazier, staring at the flames, each with a dull expression. For a moment, he even wondered if he had walked into some obscene ritual scene!

Fortunately, except for Liu Tan, everyone quickly noticed Huo Guang's arrival and greeted him.

However, Huo Guang felt uneasy when he saw Liu Tan squatting there. He couldn't help but walk over and ask, "What are you doing, Your Highness?"

"Shh." Liu Tan carefully placed his index finger between his lips and made a gesture to keep quiet, as if he was afraid of scaring something in the brazier.

Huo Guang subconsciously held his breath and looked at the brazier carefully, and then found out... the brazier was just a brazier, nothing special about it.

When he came to his senses, he felt a little embarrassed for a moment. How could he be almost taken away by their prince?

Huo Guang coughed lightly and was about to say something when he heard Liu Tan say, "Come here, bring me a clamp or something and get this thing out for me."

He was talking about the black stone in the brazier.

Huo Guang was stunned for a moment, stepped back to make room for others, and at the same time felt relieved that his prince finally knew not to do it himself.

But he soon realized that it was fire, how could he do it himself?

For a moment, Huo Guang deeply doubted whether he had become a little stupid.

At this time, Liu Tan had no idea that he had already made Huo Guang infatuated and he began to doubt himself. After he asked someone to pick out the black stone, everyone was surprised to find that there was a flame on the stone!

The red flames wrapped around the black stones, making people unable to help but widen their eyes.

Huo Guang also realized something and couldn't help but whispered, "Your Highness, have you done something? Can this stone catch fire?"

Liu Tan looked at the black stone that was still burning after being taken out and placed on the ground, and a smile slowly appeared on his face. He looked up at Huo Guang, and then looked at Sang Qian and Wei Buzhi in turn.

For a moment, Liu Tan was so excited that he even wanted to cry. He didn't know why he suddenly became so tearful. Perhaps it was because the meaning of this black stone was more than just burning.

Huo Guang and others also saw the watery light in his eyes, and gradually quieted down, waiting for what Liu Tan said.

Liu Tan took several deep breaths before he managed to steady his voice and said, "I found it."

Without waiting for anyone to ask, he said, "I found coal. From now on... the people of the Northern Territory will no longer have to endure the cold due to lack of firewood. From now on, the Northern Territory can plant trees."

Huo Guang was stunned for a moment, then he couldn't help but hold Liu Tan's wrist and asked, "Your Highness, are you telling the truth?"

Liu Tan looked down at the still burning stone on the ground and said, "Look, the fire is so strong."

Everyone lowered their heads and found that as the flame burned, the stone was gradually getting smaller. The group of people looked at the small flame as if it were a rare treasure. They didn't come to their senses until the flame burned out and only black powder was left on the ground.

Huo Guang looked incredulous and said, "So... this stone... can burn?"

Liu Tan nodded vigorously: "Yes, it can."

After he finished speaking, Liu Tan suddenly looked up at Wei Buyi and said, "Wait, take my warrant and go fence off that area! Tell everyone I'm going to use it to build a manor and grow grapes!"

Wei Buyi also realized the seriousness of the matter and turned to leave, but soon turned back and asked, "Your Highness, how big is the circle?"

Liu Tan was confused. Yes, he didn’t know how big this coal mine was.

Even if he were to go to the scene, he might not be able to make a judgment.

Before he could answer, Huo Guang decisively said, "First, fence off the area within a radius of ten miles, and then expand it little by little from this area. When you dig out more, expand the area. Are there any houses around there?"

Wei Buyi shook his head: "No, it's on the next door."

Huo Guang immediately breathed a sigh of relief. If there were people living here, he would have to think about how to relocate them, but he could not guarantee that the disease would not spread to the residents' homes.

Huo Guang pondered for a while, then turned to look at Liu Tan and said, "Your Highness, it's time to choose your auspicious place for eternity."

Liu Tan was originally happy, but when he heard this, his smile froze on his face. He slowly turned his head to look at Huo Guang, and a question mark slowly emerged in his head.

The place he lived in when he was alive hasn't even been built yet, so is he already looking for a place to sleep after his death?

Huo Guang said calmly, "After we find the auspicious site for eternity, we can start relocating the tomb-guarding village."

The emperor's mausoleum has a mausoleum town, where wealthy people are moved to live and reproduce, in order to guard the emperor's mausoleum and prevent it from being visited by tomb robbers.

The princes and kings could only have tombs. Although there were no mausoleum towns, there were corresponding villages surrounding the tombs to protect the kings' tombs.

Huo Guang was worried that if Liu Tan came up with something new in the future, he would have to move people away if he didn't want to be discovered. However, moving people away for no reason would only arouse suspicion. With this excuse, it would be much easier.

Liu Tan was slow to grasp Huo Guang's intentions, and finally said cautiously, "Don't ask me to choose the location of the cemetery again."

Huo Guang glanced at him and said, "Of course not. We should have someone look at the Feng Shui first."

Liu Tan nodded seriously, knowing that people believed this at that time.

But he soon realized that the royal palace should also be inspected by a Feng Shui master.

After all, a palace is a place where living people live, so it needs to be a place with good feng shui, right?

Why let him choose?

Liu Tan couldn't help but ask, "Why didn't they check the feng shui of the palace's location?"

Huo Guang paused, lowered his head, and said, "Your Highness, now that the autumn harvest is complete in all counties, except for Dunhuang County, which is tax-free, I have a record of tax revenue from previous years. You can take a look at it..."

Liu Tan said, "Don't change the subject!" as he saw the document that Huo Guang had copied.

Huo Guang looked up at him and said, "You've chosen so many, there must be one that is a good feng shui site."

Liu Tan: ...

He was silent for a moment and then asked, "Have you sent anyone to look for it?"

Huo Guang said with some worry, "I have looked for it, but it seems I haven't found it."

Having said that, Huo Guang couldn't help but look at Liu Tan with regret.

Liu Tan was provoked by him and rolled up his sleeves and said, "Impossible, I don't believe it! You must not know what good things those are. Take them all! I don't believe it!"

Huo Guang suppressed a smile and said, "Okay, I will order someone to bring the things over right away."

Liu Tan realized belatedly that something was wrong. Shouldn’t he be happy that he couldn’t be found?

This will dispel the rumor that he is best at finding minerals!

Liu Tan looked at Huo Guang and found that his expression was completely different from before. He couldn't help but look at Huo Guang in confusion, suspecting that he was trying to trick him.

But what good tricks were there? He didn't know a lot, and he might not be able to discover things that the people sent by Huo Guang hadn't discovered.

Just as Liu Tan was puzzled, Huo Guang said sternly, "Your Highness, how do you mine this...thing you call coal?"

When Liu Tan came to his senses, he realized that finding the coal was nothing, and the next thing was the most important thing.

This time there was no craftsman to help him, and if anything went wrong, something would go wrong.

In an instant, the smile disappeared from Liu Tan's face.

Huo Guang saw that Liu Tan's expression gradually became serious and he felt that he had asked a very important question.

Liu Tan scratched his hair and said, "Then I...I'll go think about it."

Although he didn't think he could come up with anything, but if he searched through his memory, he should be able to come up with something?

Liu Tan walked while deep in thought. Before he had taken two steps, he heard several people behind him shouting, "Your Highness, be careful!"

Liu Tan turned around subconsciously: "Huh?"

As soon as I asked the question, I felt like I bumped into something. I took two steps back and my head was buzzing.

Everyone gathered around at once, looking at Liu Tan, tears welling up in his eyes as he covered his face and mumbled, "Can't you just hold me back first?"

Everyone: ...

Isn't it too late?

But perhaps it was this collision that sparked some inspiration, but Liu Tan, covering his face, suddenly thought of something very important: "Ah, water! Be careful with groundwater when mining. There's also a flammable gas there. You have to be careful!"

Coal mine water leaks seem to be very frequent, and the flammable gas is naturally gas.

Gas is also quite annoying. If the purity is not high enough, it cannot be collected and used. Moreover, there is no better way to collect the gas now. We can only be careful not to let the gas explode.

Liu Tan didn't feel sorry for the coal mine, but if the gas exploded, it would be a major accident, and who knows how many people would die.

When Huo Guang first heard about being careful about groundwater, he didn't think much of it. You know, even other minerals can have water seepage accidents. Although he may not be very experienced in this area, he always has countermeasures.

But when Liu Tan mentioned flammable gas, Huo Guang was stunned.

How do I do this?

Huo Guang hesitated for a moment and asked, "Your Highness, how do we dig this coal?"

Liu Tan was momentarily stumped. He rubbed his face and said, "Wait a minute... I'll go back and think about it. Oh, right, have them collect some data. They must carefully observe the surrounding environment and underground rock structures at coal mining sites. Don't be afraid of details; the more detailed, the better. Got it?"

Wei Buyi immediately said, "I understand. I will give the order immediately."

Liu Tan rubbed his face and walked away. Huo Guang carefully gathered the coal dust from the ground. Sang Qian asked, "Prime Minister Huo, isn't this useless?"

Huo Guang said, "I don't know, but...what if Your Highness suddenly has an idea and it comes in handy?"

Anyway, since he met Liu Tan, Huo Guang has learned not to ignore anything.

After Liu Tan returned to his study, he sat down and thought for a while, then raised his hand and wrote on the paper: First, we must determine the depth of the coal seam.

After writing this down and putting it aside, he casually tried to pull out another piece of paper. He felt it and found that the paper was very thin. He looked down and saw that there were only a few white sheets left. The only ones left were the oldest yellow papers. He couldn't help but ask, "Huh? Why is there no paper?"

Miao Rui, who was standing by, said cautiously, "Your Highness, the paper we brought here is all used up, and the new paper hasn't been delivered yet."

Liu Tan: ??? He said something seemed wrong. He didn’t even build a workshop to make paper!