Wu Yanzhi stayed in the mountains near Pulu Village for five days, taught those people the mining, smelting, and safety management of many metal mines, and found three mining sites again.

On the sixth day, still under the leadership of Sang Hongfei, he came to a coal yard called Xinlong to check, which is close to the first Yashi Mountain Road of Sanya Road, and it is more convenient to go to Xiangcheng County.

He was about to take a look here and leave. Those of their brothers are still worried about themselves in the city.

Along the way, Yao Kuan always shouted to catch a few wild animals to give Wu Yan wine, but people thought he was joking.

This Yao Kuan doesn't know how to bow and arrow, and he wants to catch wild animals, but it's more difficult than climbing to the sky!

When he arrived, he found that the coal mine was in a mountain col, where the terrain was fairly flat, and the coal storage yard was full of dozens of tons of coal.

Sang Hongfei sent someone to inform the mine owner, and the mine owner was very surprised when he heard that a senior official had come to inspect it, and hurried over to greet him.

Wu Yan looked at it, this Liu mine owner was close to fifty years old, short in stature, but he looked very shrewd.

After saluting and meeting, Wu Yanzhi began to understand the situation.

"How much coal can this coal mine produce in a month? Who is it mainly sold to? Wu Yanzhi asked the mine owner.

"Ambassador Huiwu! There are about 150,000 catties a month, some of which are sold to people who smelt copper and iron, and some are sold to the local county seat and Nanyang City.

In the past, I also took a small road to transport to Shendu, but Shendu is too far away, not very cost-effective, the price is not advantageous, and it is almost not sold there recently! ”

"I see a lot of charcoal here, why is there no foreign transportation? The mountain roads here are rugged, how to transport them out? He asked again.

"Ambassador Wu didn't know that when he crossed this mountain, it was the Raven River. I waited for the transportation once a month, specially rented mules, ox carts, etc., to the river, and then boarded the boat, and the two boats were pulled out! ”

In this mine, transportation conditions are very important. Otherwise, the shipping cost is too high, the price is too expensive, and no one will buy it.

Subsequently, Wu Yanzhi took a closer look at the quality of the coal and found that there was still a lot of lump coal. The coal was black and shiny, and the coal quality was excellent.

Intuitively, this may be high-quality coking coal, but it is not necessarily the main coking coal. Someone happened to be burning a stove with a jar boiling water on it.

He went over and the man took the jar and looked at the burning coals in the stove! Then he took a closer look at the ashes next to him.

Based on the combustion of the coal and the burned ash, he judged that the coal must be a high-quality coking coal, but he did not know what the sulfur content was.

If the sulphur content is too high, it is not good, and the sulphur will seep into the iron, causing the steel to become brittle.

Of course, I don't have the instruments to test the sulfur content.

However, there are no large iron ore deposits in the area, and there are no steel mills built here. This coal can only be used as ordinary fuel, which must be a pity.

Then he went to the entrance of the mine again, and he did not dare to go to the mine. In case the gas exceeds the standard and a gas explosion occurs, it will be troublesome to reimburse yourself.

He inquired about the occurrence of coal seams underground, and learned that it was a slow-dipping coal seam. According to their comparison, the average slope is about 20 degrees.

The average thickness of the coal seam is about 1.4 meters, and the roof is hard fine sandstone.

When he heard this, the top and bottom plates were hard, which was a good thing for the mining of their small coal mines. Because the amount of support can be reduced, and the probability of roof accidents is also lower.

Of course, the roof is too good, which is very unfavorable for the long-arm backward coal mining in later generations. Because the roof will not be pressed periodically, it will not collapse with mining; The goaf was also not filled.

If the overhanging area is too large, it is easy to cause a large area of roofing, it is extremely dangerous.

The so-called forced roof is to drill the hole and fire the gun, put down the roof of the goaf, reduce the top pressure and the danger of roofing.

This is a bit like adopting the forward knife-pillar coal mining method, that is, if you mine a few meters, you have to leave a few meters of coal pillars, and there is no danger of rising to the top, that is, the loss of coal pillars is very large.

Of course, to put it mildly, he is not as good as the knife pillar coal mining method, because he does not have a return air roadway. This is also the technical and safety management problem that Wu Yanzhi wants to solve for them.

……

Wu Yanzhi told them about some methods to prevent gas explosions and carbon dioxide poisoning, ventilation management, stope layout and other technologies.

In the end, the production process of the bellows was handed over to them, so that they could reduce the number of working faces in the underground.

Every time before going into the mine, you must blow away the gas and carbon dioxide inside before you can enter the mine. As long as ventilation is ensured, there is no need to worry about accidents.

Of course, how much these people can understand, Wu Yanzhi can't control. He decided that when he had time, he hurried to compile a simple "Instructions for Coal Mining", in which he emphasized safety management.

These farmer brothers risked their lives digging coal in the mines, earning barely enough to support their families in a single day, and if a laborer died in the mines, his family would be ruined.

……

After having lunch at the coal mine at noon, Wu Yanzhi, under the leadership of Sang Hongfei, left the coal mine, took the sidewalk, and rushed towards the city and county.

The so-called side road, of course, is a small road, because the mountain bandit Gou Chong has been injured and suffered heavy losses, and it is impossible to ambush again. And it's hard to be being pursued by Captain Xu. So the crowd was not worried about being robbed.

However, of course, this side road is far from being compared to the official road, it is just an ordinary country road, and the road is very rough and narrow.

Fortunately, it didn't rain for a few days, and if it did, the road would have been muddy and very difficult. Nasang Hongfei walked while observing the surrounding situation.

Yao Kuan looked at him and couldn't help asking, "What are you looking at?" Is there still a tiger and a leopard? ”

"It's hard to tell! There are often tigers in this area. Usually there are more than a dozen people walking together, and there are only five of us! He was a little worried.

"With you and Yufei, the archers, what are you afraid of?" Jiang Shipeng said with a smile.

But as soon as the words fell, suddenly Sang Hongfei became extremely nervous, and said softly: "Everyone, stop!" There's a male bear over there! ”

When everyone heard, there was a bear?

Everyone looked in the direction Sang Hongfei pointed, and sure enough, they saw a huge bear. Wu Yan Yi, this bear is also too big! It doesn't seem to be a black bear, it's obviously a large male grizzly bear.

I saw that Yufei sneered: "It's just a bear, wait for me to shoot it!" ”

After that, he opened his bow and set up an arrow, and he was about to shoot the brown bear, but Sang Hongfei couldn't see it well, and he just wanted to stop it, but Yufei had already shot it with an arrow.

Finished! Sang Hongfei immediately reminded: "Everyone quickly draw their swords and prepare for defense!" ”

Everyone didn't pay attention to it at all, thinking to themselves, this Yufei is a magic archer, and this arrow must not kill the big bear?

But look at the arrow, with a screeching sound, flying directly to the neck of the big bear. The bear lifted slightly, and the arrow plunged into the bear's front leg.

I saw that the big brown bear, who was originally just looking up at everyone, first shook the arrow on his shoulder after being attacked, but it still didn't fall.

Then, perhaps feeling a hint of pain, it stood up on its front legs and roared, apparently demonstrating to several people, before lowering its front legs and running towards the crowd with a loud roar.

Wu Yan looked, damn, this bear's skin is too thick! But he complained bitterly in his heart: Oops, I'm afraid these people can't fight this big grizzly bear!