Tian Zhong and their camp can still see the traces left, they have not been affected by the collapse of this mountain range at all, but it is estimated that they saw the collapse of the mountain range here, and they were afraid that the mountain range on their side would also collapse, so they chose to leave this place.

Judging from the traces left behind, Tian Zhong and they seem to have lived here for a long time, so the question is, all this ...... Is it the work of the Spirit of the Jade Gate, or is it naturally formed? It looks more like it was naturally formed.

It's just such a massive collapse...... If it weren't for an earthquake, it would be very difficult.

"General, is this the vein you are talking about?" Xu San walked over and asked respectfully.

"Yes." Huo Gang nodded.

"Isn't this the Lime Mountain? This kind of thing is very common. Xu San jumped off the horse directly, took a few steps forward, picked up a stone and looked at it carefully, and even stretched out his tongue to lick it, before turning around and speaking to Huo Gang decisively.

"You know?!" Huo Gang was stunned for a moment.

"Know, it can burn lime, we can make lime mortar to build a house, such a large piece of natural ore vein, this is really a good thing, the problem of building a house has been solved, general, don't we need to repair the Yumen Pass? This thing is a good thing. Xu San said with a quick smile.

Huo Gang: "......"

Huo Gang was a little dumbfounded, no, how can people of your time know about this thing? Tian Zhong didn't know it before! And there is also lime mortar? This...... Have you been playing with this thing since the Middle Ages?

This was completely unexpected by Huo Gang! He really didn't know that.

However, since Xu San said it so easily, it means that people in this era have already begun to use this thing, which is worthy of being a craftsman who follows Anno, and his knowledge is much wider than that of Tian Zhong.

"General?" Huo Zheng, who was standing beside Huo Gang, seemed to be stunned when he saw Huo Gang, and reminded him in a low voice.

"Ahem, it's okay, this is indeed a good thing, I'm here to confirm this, Xu everyone, will you burn lime?" Huo Gang asked directly.

"I won't, but Sun Er should be, although the pottery is different from this, but their principle is the same." Xu San immediately spoke.

"Yes, General, although I haven't burned it, as long as I am told the method, I should be fine." Sun Er immediately bent down and saluted.

"General, are we going to build a kiln here and burn lime?" Wang Luo looked around and said, this kiln is the work of their masons.

"Yes, but we're not burning lime, not primarily, to be exact, but we're using it to make something else." Huo Gang took a deep breath and said, although Xu San knew that lime had caused Huo Gang some surprises, but he was very sure that only the Romans had used primitive cement in ancient times, and cement was definitely a modern invention.

"Sun Er, can you see if you can find clay around here?" Huo Gang asked again.

Sun Er was stunned for a moment, but he immediately began to look left and right, there was a lot of grass near where they were, but the grass was not very good, it was very barren, but although the grass was not good, since there was grass, it meant that there was water underground, not sand.

"General, I can't be sure, there are some places that may need to be excavated to find out." Sun Er took a closer look at the neighborhood before he turned around and spoke.

"Okay, then I'll arrange a task, Sun Er, I'll send you twenty people, you lead them to start looking for clay nearby, the best can be found nearby, if you can't find it, as long as you find it in our sphere of influence! You should understand the general topography of the clay formation. ”

"Yes, General." Sun Er immediately spoke seriously.

"Wang Luo, Xu San, Tian Zhong, I need you to build the furnace for burning lime here, and the house that our workers will use later, and I also need to use a few large stone mills, because my calcining needs to grind these limestones into powder." Huo Gang said.

"Stone mill I am going to use the wind power of the windmill to replace, how much stone mill is needed to grind limestone into powder, you study, because the efficiency must be considered later, the size of the problem you first make a moderate consideration, in the early stage, we can use horses or cattle to pull the stone mill." Huo Gang probably said his request.

Because the hardness of limestone is not high, it can be polished into powder by stone grinding, these are not problems, as for lime, since there are people who know it in this era, Huo Gang believes that these craftsmen can complete it, don't underestimate the wisdom of the ancients!

"How? Can this be done? After Huo Gang finished speaking, he looked at them and asked.

"General rest assured, these things are not difficult, they just need some manpower." In the end, Xu San discussed it with a few people, and then spoke.

"Okay, I'll send you as many people as you need, and if you need cows and horses, you can also apply. I've already sent someone to buy charcoal. Huo Gang said.

"It's the general, but we may need the Sun family to find clay, so that the cellar furnace behind us can be built with bricks."

"Well, these things are going on at the same time, and this first cellar furnace may need you to build it with stones." Huo Gang nodded, "Lu Mu, do you think the windmill can be built to grind?" ”

"Back to the general's words, it can be, I just discussed with Master Wang Luo and Master Xu San, if you grind these lime ores, the stone mill required is very large, and to drive such a stone mill, the windmill required is probably more than forty feet high, and a single fan surface will be more than ten feet to twenty feet long."

"We haven't seen such a windmill before, mainly because the wood required for its structural parts must be very strong, and we don't have such a large leather, just sheepskin needs a lot." Lu Mu replied respectfully.

"Can you make the blades directly into wood?" Huo Gang thought about it, in fact, in this place, the European-style tower windmill is more practical, because the wind blowing in the Western Regions all year round is almost always a west wind or a northwest wind.

And in this position where they are, the south side is the east-west Qilian Mountains, the north side is also east-west, the small mountain range where Yangguan is located, between the two mountain ranges is a narrow canyon, this place, the most in the four seasons of the year is the west wind, occasionally there may be winds blowing from other directions, but too little.

So here, the tower windmill is more practical, and the most important thing is that the tower windmill can be made taller and larger, and more stable, don't forget, this Western Regions will blow sandstorms, so that the tower windmill is more solid, and you can also directly use cement to make the tower body.