"Old Song, let's go. You don't have much time to give me, and it's time tight."

Seeing Song Tianyu nodding, Fang Yi was also very satisfied. Judging from the spirit stones obtained by Ito and others, there must be a spirit stone vein under his feet, and five or six days is enough for Fang Yi to obtain enough spirit stones.

"Okay, let's go to the mine first."

Song Tianyu knew what Fang Yi meant, so he took the lead and walked out. In fact, Song Tianyu had some thoughts about this spirit stone vein. Before the sect came, he could still gain some Fang Yi's glory. If he could not afford three or five spirit stones, he could always get it.

"The mine is there, I'll go down first?"

When he arrived at a place more than 100 meters behind the terrace house, Song Tianyu stopped. In order to survey the reserves of underground diamonds, the staff dug more than a dozen mine caves of different sizes within the mine. The mine that Song Tianyu came to at this time was the deepest one among them.

"Okay, be careful." Fang Yi nodded and said to Song Tianyu with a smile: "Old Song, don't say I don't care about you. All the spirit stones you found before you left belong to you. As for how to hide those spirit stones, it's your business."

"Hehe, thank you brother!"

Song Tianyu couldn't help laughing when he heard this. He was planning to stay here for three days before leaving. These three days were naturally used for mining. Although Song Tianyu wanted to reward the sect, he had this opportunity. Song Tianyu didn't want to miss the spirit stone that was equivalent to currency in the world of cultivators.

There are usually two types of mining diamond mines, the first one is open-pit mining.

Open-pit driving means digging the soil and rocks covering the ore body first and mining directly in the open-pit. Since the mining work is carried out in the open-pit, this method is much faster than underground mining. Usually, step-by-step mining is used. After mining, deep pits of hundreds of meters deep will often be left on the ground.

The largest and deepest open-pit diamond mine in the world is Siberia where Fang Yi and Song Tianyu are located, and is called the Peace Diamond Mine by the world.

This is a diamond mine discovered and mined in 1955. It was not closed until the past two years. After half a century of mining, the diamond mine is more than 500 meters deep and has an entrance diameter of 1,200 meters, which is equivalent to 161 floors high. It is the second largest huge pit in the world caused by man-made excavation, second only to the Bingham Canyon Copper Mine in the United States.

The second method is underground mining. As the open-pit mine expands, the waste stones that need to be transported will increase, and the cost of transporting waste stones will continue to increase, which ultimately makes underground mining more effective than open-pit mining.

When surveying diamond mines, the second method is usually used, which is to create a mine cave and drill the depth of kimberlite deep into the strata to judge the reserves of diamond mines. The mine chosen by Fang Yi and Song Tianyu is a mine cave with a depth of more than 50 meters.

"Fang Yi, be careful, there are piles of stones underneath."

Song Tianyu jumped into the mine first. Because he wanted to survey the veins of the diamond mine, the mine was not straight down, but extended more than fifty meters in winding down, with a depth of only three or four meters at the entrance.

"It's okay, Lao Song, please be careful."

Fang Yi agreed and jumped down lightly. Although there was darkness in the mine, the influence of Fang Yi and Song Tianyu was not great. With their cultivation, they could see things in the darkness, but they were different from Song Tianyu's eyes widened and looked around. Fang Yi used his spiritual sense to observe the situation in the mine.

"It should be here." Fang Yi nodded slightly in the darkness. He could sense the trace of spiritual energy remaining in the mine.

"Fang Yi, why is the temperature here so low?"

Song Tianyu walked in a few steps, couldn't help but shivered, and said, "According to common sense, the temperature underground should be higher than the ground, but it's too cold here."

At this time, Siberia was the coldest season of the year, and the ground temperature was usually minus 50 or 60 degrees below zero, but Song Tianyu found that the temperature in the cave seemed to be even lower, so cold that his blood seemed to be unable to flow.

"Let's take a look inside."

Although the temperature was extremely low, the other party had no effect. Moreover, the low temperature also made Fang Yi secretly happy, because the Arctic ice cave he encountered last time was so cold, and Fang Yi found more than ten spirit stones in it that time.

"Okay." Song Tianyu started to practice his skills, and his body was a little stiff, but the more he went inside, the lower the temperature. If he had not been promoted to the innate world, Song Tianyu would have been frozen long ago.

"No wonder the early exploration progress of this diamond mine is so slow."

Song Tianyu was moving his body and said, "Not to mention winter, even in summer, the temperature underground is probably not much higher. We are all frozen to this way, and those ordinary people are even worse."

"There should be equipment outside to get the electricity inside, right?"

Fang Yi observed the situation in the mine and found that the mine had a conveyor belt installed on the ground, and there was a lamp on the wall every few meters. Although Fang Yi could see things in the dark, if there was a light, it would be much more convenient.

"I'll go out and have a look." Song Tianyu's cultivation is far inferior to Fang Yi, and his eyes are not real to look around. He greeted Fang Yi and returned to the ground.

After about seven or eight minutes, Fang Yi suddenly heard a roar from the ground in his ears, and then the lights in the mine began to light up. Then Song Tianyu jumped down and said, "There is a diesel generator, but there is not much diesel, so it can only take five or six hours at most."

"You know if you really dig out the spirit stone without lighting."

Fang Yi smiled and shook his head. In the eyes of ordinary people, the spirit stone may be a crystal clear jade, but the cultivator can sense the spiritual energy emitted from the spirit stone. Song Tianyu is now a congenital cultivator. Although he cannot practice with spirit stones, there should be no problem in sensing the spiritual energy.

"How do you dig this?"

Song Tianyu scratched his head, the mine cave was down and the lights were turned on, but he had no experience in how to mine the spirit stones. Looking into his eyes, the entire mine was full of soil and stones, and Song Tianyu had no idea where to dig it up.

"I don't know this either."

The spirit stones that Fang Yi encountered in the Arctic Ice Cave were all on the surface of the ice cave, and he could get them with just a hand. This was the first time Fang Yi saw the spirit stone vein like the one in front of him, and he didn't know where to start.

"There are tools over there, I think we can find a direction to dig it in."

Fang Yi didn't want to waste his time, so he pointed to the manual gravel hammer in the mine and said, "Old Song, we have said so much before. It would be funny if this is not a spirit stone vein. Don't talk nonsense, start working."

"Okay, I'll dig in from here." Song Tianyu nodded, reached out and picked up a gravel hammer. He was also afraid that he would make a mistake. If there were only those three spirit stones here and he reported it again, the reward of the sect would probably turn into punishment immediately.

The gravel hammer is the most commonly used and common tool in the mine cave. It is also called a gravel crusher. After shaking the hard stone walls and ground, and activate the gravel hammer in his hand, a huge roar suddenly sounded in the mine cave.

Using a gravel hammer requires a lot of arm strength, which is not a problem for Song Tianyu and Fang Yi. The two brothers chose their own directions and dug them in the mine cave with a stone crusher. The pieces of gravel were sent to the conveyor belt and transported to the ground.

The broken stones of the stone crusher are all small stones and frozen soil. If there are spirit stones inside, it is impossible to escape the mental sensing of Fang Yi and Song Tianyu. However, after working hard for most of the day, neither of them found a spirit stone.

During this process, Fang Yi found that some crystal clear small stones were mixed in the soil and ore. However, Fang Yi was not interested in diamonds, and only occasionally picked up one or two more conspicuous particles and put them in his pocket.

Five or six hours passed, and even though Song Tianyu was already a congenital cultivator, his arms were sore that he felt sore in his arms. The stone crusher, which was originally light in his hand, seemed to have become heavier. Just as he was about to go out for a rest, Song Tianyu suddenly felt a faint trace of spiritual energy.

"Hmm? I picked it, I picked a spirit stone!"

After throwing away the stone crusher, Song Tianyu almost lay his whole body on the ground. He carefully picked up a spirit stone that was only slightly larger than his thumbnail, and rubbed it hard on his clothes. Song Tianyu's face was full of excitement.

"It's true."

Fang Yi came over after hearing the sound, glanced at the spirit stone in Song Tianyu's hand, and smiled bitterly, "Old Song, I feel that I am at a disadvantage. I have only dug a spirit stone in the past half day. Even if I dig for five or six days, I can only dig a few?"

I don't know if it was affected by some substance in the mine, Fang Yi's spiritual consciousness could not penetrate the soil and kimberlite to find spirit stones, so he could only use this stupid method like Song Tianyu, but the efficiency of this method was too low. So far, Fang Yi has not been able to mine a spirit stone.

"Fang Yi, you are content."

Hearing Fang Yi's words, Song Tianyu couldn't help but curl his lips and said, "The spirit stone veins are not that easy to mine. You know that in the spirit stone veins in the spiritual stone veins of the cultivator realm, thousands of mortals can only mine a few spirit stones every day. We can dig one in half a day, which means that the spirit stone reserves in this ore vein are definitely quite large."

"The problem is that I'm at a disadvantage."

Fang Yi glared at Song Tianyu in anger, and turned around and started working again with the gravel hammer. However, Fang Yi knew that Song Tianyu was not easy to use his methods here. After Song Tianyu left, Fang Yi could speed up his efficiency in mining spirit stones.

"You've got three more dollars before."

Song Tianyu complained in his heart, and picked up the gravel hammer and continued to mine. After obtaining a spirit stone, Song Tianyu seemed to be full of strength again, and his originally sore and soft arms seemed to be fine.

I don’t know if my luck is really not as good as Song Tianyu. During the three days of sleepless excavation, Fang Yi actually dug only one spirit stone, while Song Tianyu actually mined seven. With his own strength, he dug out a passage more than 40 meters long.

"Fang Yi, I'm going back."

After getting the seventh spirit stone, Song Tianyu called Fang Yi up and said reluctantly: "I have to go back, otherwise I can't explain to the sect that I will hand in two of these seven spirit stones, and then you can take two of them too. Plus the one you mined by yourself is equivalent to three of each of our brothers."

To be honest, Song Tianyu was really embarrassed at this moment. There were indeed spiritual stone veins underground, but Fang Yi's luck was really bad. He dug one in three days. If this were the case in the next few days, Fang Yi's harvest was probably not as much spiritual stone as he had snatched from Ito and others.

However, not all of these seven spirit stones belong to Song Tianyu himself. He needs to take out two of them and hand them over to the sect. Otherwise, without any evidence, Song Tianyu would not be able to make the sect believe that there is a spirit stone ore vein here. As for the two spirit stones handed over, Song Tianyu doesn't know whether the sect can return them to him.

"Old Song, yours is yours, you don't have to give it to me." Fang Yi shook his head, pushed the two spirit stones back, and said, "I have three days left. Maybe I'll dig more than you. You can keep these spirit stones yourself."
Chapter completed!