Zhong Hou thought of a fatal question at this time.

When he left the monkey tribe that day, he took a sample of water quality, so that one day he could figure out what substances were in the water, and what substances were decreasing, causing changes in water quality.

However, how can these two questions be confirmed?

There is no answer to these two questions, and even if the Xuanyin sand vein is found, it cannot be confirmed by each other.

Zhong Hou suddenly patted his head.

Why did you forget the three books sent by Ning Fengzi?

If you don't understand, can't you turn the book?

The grinding gun is not fast and light.

So, he followed the army and read a book at the same time.

For a cultivator, it is not very difficult to be distracted.

Not to mention, walking and reading are not very complicated things.

Despite the hurried efforts, it took three days to reach the destination.

In the past three days, Zhong Hou has really found some doorways.

The most basic requirement for learning exploration techniques is to know how to release mental power, because the ore veins are generally underground, and if the spiritual power cannot penetrate into it, it is impossible to judge whether there are mineral deposits inside.

With Zhong Hou's current realm, he naturally can't release his spiritual power, but he doesn't need to do this, he just needs to hold things in his hands, and he can also achieve the effect he wants.

For example, if there is a piece of gold buried in the ground, and you don't know how to release your spiritual power, you can't know the existence of the gold. But now that the gold is in your hands, you don't know it yet?

The same principle is the Qiankun bag, as long as the Qiankun bag is placed on the body, the spiritual power can directly enter the internal space of the Qiankun bag to achieve the purpose of storage and withdrawal. If the Qiankun bag left his side, it would be invalid for Zhong Hou.

This also shows that if the spiritual power can be released, even if the Qiankun bag is far away from you, as long as the mental power can cover it, then the Qiankun bag can still be used normally.

For three days, Zhong Hou carried out many repeated trials.

The operation process is very simple, that is, put your hand directly into the water quality sample, and use your mental power to feel it carefully.

Water is the source of life, and the cultivators of this world will also study and analyze water. Of course, all the purposes of a cultivator's research are to improve their strength.

Studies have shown that the substances contained in water are largely the same, but there may be slight variations in different environments.

Based on the results of the current experiment, Zhong Hou has come to three conclusions.

First, there is only one unknown substance in the water quality sample, and the rest of the substances are all known to Zhong Hou and are very common. It is a conventional substance, and there is no shortage of water anywhere.

Second, if an unknown substance is decreasing and the water quality is changing, then it is enough to confirm whether the substance is black silver sand. However, after confirmation, if you want to solve the problem, you can only find a substitute for the black silver sand.

Third, if there is a change in water quality due to the decrease of other substances that Zhong Hou knows, then the problem can be solved by bringing in water from elsewhere.

In other words, the second point can find the problem, but it is not known whether it can be solved. The third point is that you can't find the problem, but you can easily solve it.

However, on a comprehensive analysis, the second point is very likely.

Now Zhong Hou needs to confirm whether this unknown substance is Xuanyin sand or not.

The Xuanyin sand vein is only a dozen kilometers in radius, and the scale is not very large.

However, the size of the vein is not measured in terms of footprint, but in terms of depth.

The reason why the scale of the Xuanyin sand vein is not large is because the depth of this vein is only more than 100 meters, and it has been mined for less than 100 years, and it is close to exhaustion.

There are dozens of ore veins in the territory of Half Moon Villa, the largest of which has been mined for thousands of years but still only less than one-third of the place.

There are more than 100 mine caves within a radius of more than 10 kilometers, and the entrance of each mine is filled with earth and gravel dug out of the ore vein, plus some flowers and trees, which caused the entrance to be filled in instantly after the earthquake.

Since there are no modern and advanced tools, the process of mining veins can only be done by hand, so the only way to dig the hole is now.

There were countless disciples at the scene, some of them were digging with hoes, and the clanging sound was non-stop. Some carried flat baskets and transported the debris dug out.

At a glance, this group of cultivators still had the appearance of being high in the past, all of them were gray-headed and dirty, and they were completely a hard-working miner.

Longshan briefly introduced the location of the mines, and then divided more than 10,000 people into more than 100 parts, distributed hoes and baskets, and immediately pointed out the excavation areas they were responsible for.

When everyone dispersed, Zhong Hou came to Longshan with his hoe.

Before he could speak, Long Shan interrupted: "I know that you are the young sect master, but when you come here, everything must be listened to me." Don't try to be lazy with your identity, it won't work with me. Human life is at stake, dig the hole a day earlier, the disciples inside will have a better chance of survival, as a young sect master, you should understand this truth. ”

Hearing this, Zhong Hou was stunned for a while.

Where's this?

When did I say I was going to be lazy?

smiled bitterly before he said, "Elder Long has misunderstood, I just want to ask if you have any Xuanyin sand on you, borrow me to observe it." ”

"Hehe, I misunderstood... Long Shan smiled awkwardly, and then grabbed a handful of things from the Qiankun bag.

Zhong Hou took it with both hands, and his ten fingers were closed as much as possible, but there was still a lot of dark silver sand oozing out of his fingers and spilling all over the ground.

The shape of the black silver sand is the same as that of ordinary yellow sand, but the color is very bright, bright silver, and the texture is very strong, without the softness of yellow sand.

"Can you give me these silver sands?"

"You can take it if you want, but this little bit of Xuanyin Sand has no effect at all, what are you doing with it?"

"Just looking into it. By the way, I wonder if Elder Long is familiar with the situation of the other two ore veins?" Zhong Hou didn't want the other party to investigate deeply, so he immediately changed the topic.

"It's not familiar or unfamiliar, you basically know, if you want to know anything, just ask. ”

"I would like to know if there is a river next to the other two veins. ”

"Nope. ”

"How long has the sect been mining this Xuanyin sand vein?"

"Ninety-nine years. ”

"Thank you. ”

got the exact answer, Zhong Hou was determined.

Then I found a relatively remote place and took out a water quality sample for final confirmation.

Multi-party comparison, repeated verification, and then combined with evidence from all aspects.

In the end, Zhong Hou was finally ninety-nine percent sure that the problem with the water source of the monkey wine was caused by the mining of the Xuanyin sand vein in Half Moon Villa.

After temporarily letting go of this heart stone, Zhong Hou immediately threw himself into the rescue.