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In the past two days, He Jingkun organized the absentees to continue to advance in the direction of 50 meters according to Jiang Hai's requirements.

And every time he went down the well, He Jingkun had a little different experience from the beginning.

Especially in the analysis of the samples collected recently, He Jingkun came to a conclusion that he was shocked: this mine is likely to be a high-rich ore with an average grade of 56 hematite.

After Jiang Hai came, He Jingkun changed his not very optimistic attitude in the past, and congratulated Jiang Hai with a smile: "Manager Jiang, there may be a surprise in this mine." ”

"Really?" Jiang Hai looked like Zhuge Liang knew it, "For me, I may be able to accept any situation, so there is no big surprise." ”

Jiang Hai patted He Jingkun on the shoulder, "Actually, as long as you believe in yourself, it doesn't matter what the result is, what we want is the process of this experience." ”

He Jingkun actually admired Jiang Hai even more, the more this kid looked at it, the more sophisticated he became.

According to the usual theory, the most suitable development method for iron ore buried at a depth of 50 meters below the surface should be the shallow hole ore retention method, and the geology here is very stable, and the thickness of the ore body has also reached the level of medium thickness, and it is the most economical way to mine with the shallow hole ore retention method.

However, after giving it to Jiang Hai, the latter did not adopt this most economical mining method, the main reason is that He Jingkun told him that although the investment in the early stage of the shallow hole retention method is less than that of other mining methods, this mining method has one of the most fatal shortcomings, that is, the recovery rate is too low.

Although the release rate of shallow hole ore retention method can theoretically be as high as 60%~75%, in practice, this mining method can eventually cause about 30% of waste, which does not meet the said standard. In other words, if the storage capacity of this mine is one million tons, the mining method of shallow hole retention method is adopted. In the end, 300,000 tons of iron ore were wasted in the mine!

What is this concept?

The reserves of this mine itself are not very large, and if this mining method is adopted, the waste of iron ore alone is enough to make Jiang Hai feel distressed.

Therefore, Jianghai adopts the most common bottomless pillar segmented caving mining method. Although the initial investment of this mining method is high, the maximum loss of iron ore by this mining method is only 20%.

This greatly ensures the amount of iron ore mined. Of course, this is also the most important part of the mine owner.

In the end, He Jingkun in accordance with Jiang Hai's ideas, the use of the bottomless pillar segmented caving mining method for mining, mining, ore chute, pedestrian ventilation equipment well, equipment well liaison road, chute liaison road, cutting well, segmented contact roadway, mining roadway, stage transportation flat roadway, cutting roadway, machine repair room, etc.

And there are very few wooden supports in the roadway. Most of them are a combination of concrete support and spray anchor support.

In this way, everyone's safety is ensured, which also shows He Jingkun's professionalism in this regard.

Because Jiang Hai was very interested in going to the mine, after leaving Shaolin to guard above, Jiang Hai followed He Jingkun down the mine together.

Follow the sidewalk down the pit to the mining roadway below, and the big guys will move separately. In addition to Jiang Hai He Jingkun, the other absentees also came down this time.

Because of today's power outage, the underground is very dark, and the operation was not prepared, but everyone saw hope. I just wanted to collect more samples.

In the mines, even if there is a miner's lamp overhead, in this kind of mine fifty or sixty meters underground, if the timid person is absolutely scared.

According to the express regulations of the fluorite mining company, when going down the mine, it is necessary to ensure that there are two people at the operation site at the same time, Jiang Hai walks down the inclined pedestrian shaft, and when he walks to the mining roadway, he follows the distribution map of the entire mine and advances along the mining roadway to the farthest excavation front.

The work of the fluorite mining company is still quite in place. Even in the underground mining roadway, the situation in the roadway is still very good. Not to mention, these walkback roadways are very clean, except for some large equipment that is inconvenient to transport out. Other messy little things are rare.

However, the further he walked, the more messy the roadway became, and to Jiang Hai's surprise, the farthest roadway did not go all the way down, but when it reached the deepest point, it began to gradually go up again.

This is rare. However, it is not for nothing, because the underground mining face is mined according to the trend of the vein, so the horizontal position of some mining roadways is not static, and there are ups and downs.

Although Jiang Hai has also gone down several wells before, but this farthest excavation face has not been visited by all the staff of fluorite mining companies, this time to this farthest excavation face, the main work is done by He Jingkun, Jiang Hai is to collect the number of jù collected by He Jingkun on the side.

The next shaft was troublesome, and the mine stretched for kilometers underground, and the farthest point alone would have taken nearly an hour to walk. The alleyway was very quiet, and the footsteps of two people could be heard far away. Fortunately, it was two people walking together, otherwise, it would be difficult for ordinary people to walk alone for an hour in such a dark well. He Jingkun was already accustomed to this situation, and while speaking, he introduced the work of ore vein development to Jiang Hai.

Speaking of which, the veins of this hematite are really small among the veins he handles.

This hematite is actually a barren mine, and he has not opened silver mines and gold mines in fluorite mining companies, especially the golden mile gold vein mine in Africa, which is the most important vein that makes fluorite go to the world and dominates Africa.

It was also that mine that made Shi Ying.

Let her transform from a small mine engineer to start a fluorite opening company.

Jiang Hai inquired and learned that Shi Ying was working in a mining company, and with the deepening of his research on ore veins, he began to think about mining.

She was a little girl at that time, where was there this kind of financial support, I heard that her boyfriend raised the first pot of gold for her, relying on this fund, she strategized, and then during a business trip to Africa, she got the mining rights of this vein, independent portal, led a few absenteeism, and used her boyfriend's funds to maintain the mine with difficulty, and then excavated gold.

It becomes white Fumi.

But it's a pity that the boyfriend took the money and also made a transaction, what the specific situation was, I don't know, in short, the two were fated and didn't get married.

Jiang Hai listened, but naturally thought of it, that boyfriend was probably Zhao Yang! (To be continued.) )