Judging from the schematic diagram of the mine, the Yantugou bauxite mine is a large-scale mine, with a designed production scale of 1 million tons/year.

The scope of the mine is very broad, with an area of 20 square kilometers.

No wonder the early investment is so huge, hundreds of millions of funds.

Xu Xin started the system and set a single Al2O3 content, according to the data, in addition to bauxite, there are clay ore and iron ore in this mining area, but there is no surplus energy at hand, so the only measurement can be made.

The depth is directly adjusted to 400 meters, the ultimate depth that can be analyzed by the stratigraphic analysis horizon.

Looking at the ground, the line of sight is like a laser, penetrating layers of thin or thick strata, reaching 400 meters underground.

Quaternary floating soil......

Mudstone......

Dolomite......

Judging from the results of the lithology of the stratigraphy, his current position is the underlying stratum of the ore layer. The ore layer above has been weathered.

Continuing to walk, about two hundred meters or so from the headquarters, the stratum suddenly changed drastically.

The automatically generated section in the field of vision is no longer a picture of layers of lines parallel to the obvious boundary of the strata, but a curve of an arc suddenly appears.

It looks very strange in the stratum, as if a huge tunnel has appeared underground.

In the middle of the "tunnel", the lithological patterns are complex, and in some places there are dense small black dots, which represent fine sandstone.

In the middle of the small black dots, sometimes you see sharp triangles, sometimes you see small rounded circles.

Such lithology is very rare in mineral geological exploration.

On the contrary, it is widely used in engineering geology.

"Gravel?"

"Pebbles?"

"There's another layer of alluvial soil on top?"

"Is this a rock formation created by the impact of the riverbed?"

One difficult question after another lingered in Xu Xin's mind.

It seems that this place was once a big river, but for some unknown reason, the river channel was buried by all kinds of mud and stones, and it is completely impossible to see the traces of the past.

And in this area, because the soil and rocks are soft and suitable for vegetation growth, it is surrounded by dense pine forests.

He is really a little uncertain, his real geological knowledge reserve is not as good as a geological person with the least qualifications.

"How did the lithology of the strata in this vicinity be described in the previous data?" He questioned the two geotechnicians beside him.

The two technicians who accompanied him were both young people, and they took out the report they carried with them, as well as a section field record book, and looked through them for a long time.

One of them muttered: "This is the weathering zone of ore-bearing shale, and there are some upper strata, that is, the weathering of roof limestone. ”

"According to the information, and your understanding, this is still a normal formation?" Xu Xin really couldn't hold back and smiled sarcastically.

"Yes, but it's more weathered." One of the technicians nodded firmly, not noticing the change in Xu Xin's expression at all.

Another technician pointed ahead and tried to prove his words, "We go less than a hundred meters before we can see the outcrop of the mine." ”

Xu Xin came to check the situation of the ore formation, and he didn't care about the sudden changes in the rock formations here.

A few people walked about a hundred meters forward, and the slope dug out by the field road was exposed with gray-white bauxite, which was very loose due to weathering.

According to the data, the ore-bearing rock series is the Permian Liangshan Formation, with a layer of shale below, a stable magnetite layer under the shale, and a thin coal seam can be seen locally.

This dew point fully validates this statement.

A single point doesn't say anything.

Xu Xin glanced at it and continued to walk forward.

When I looked through the ground, I saw that the ore layer was inclined at an angle of about 7 degrees, and the slope was very gentle and inclined to the earth.

In the horizon, ore layers began to appear.

Al2O3 grade: 60%

Thickness: 3.1m

Less than 200 meters ahead, the ore body has undergone a dramatic change:

Al2O3 grade: 75%

Thickness: 37.9m

After walking another 300 meters, I saw that the situation of the mine had taken a sharp turn for the worse:

Al2O3 grade: 46%

Thickness: 1.1m

Continuing fifty meters, the ore body is almost gone:

Al2O3 grade: 15%

Thickness: 0.3m

The ore layer goes from thin to thick, then thins again until it disappears.

For the next 500 meters, there was no more bauxite enrichment.

What does this mean?

This is not a sedimentary deposit at all, but a lenticular ore body!

Xu Xin asked with some uncertainty: "What is the type of deposit of the large bauxite in Yantugou?" ”

"Sedimentary deposits, the top plate is limestone, the bottom plate is shale, sandy mudstone, and the strata are very stable." One of the technicians replied as a matter of course.

The idea of sedimentary deposits, since the end of exploration more than a decade ago, has firmly supported the argument for large deposits.

However, in Xu Xin's eyes, the truth of this kind of nonsense with his eyes open was completely revealed under his nose.

At that time, why did the expert group fail to pass the acceptance of the exploration project repeatedly?

Experts are not blind, they have already seen that they are tired of cats, right?

However, the difference between sedimentary deposits and lenticular deposits is so obvious, how did they confuse the public and finally pass the acceptance?

Where is the specific cat?

"Look, we've come this way, how many boreholes have been drilled?" Xu Xin asked.

"Four boreholes, the middle borehole spacing is smaller, and the spacing to this side is relatively large."

"I only saw three boreholes on the engineering layout drawing, where did I miss one?"

"Not to be missed, three of the holes were drilled 12 years ago and one was drilled last year to validate the accuracy of the data from previous holes."

"You don't count the drills you made!"

Xu Xin snorted, laid the engineering layout plan on the road, and gestured his finger to the distance between the drilled holes.

"The distance between the two boreholes at both ends of our position was 700 meters! This is not in accordance with the rules, if it is a sedimentary deposit, the situation is so good, and it is a detailed survey, the best plan, the drilling spacing of two or three hundred meters is considered long, and the grid spacing of one hundred meters is no problem to make a hole! ”

"Uh...... This is a borehole that was laid out more than ten years ago, perhaps because the exploration cost is not high, and the drilling is not so dense. ”

"The cost of a bullshit survey is not high!" Xu Xin couldn't help but scold.

He didn't mean to scold the people around him.

He, an entry-level geology person, saw that it seriously did not meet the requirements of the specification!

The speaker has no intention, but the listener has the intention.

The two geological technicians glanced at each other, both young and vigorous, and suddenly they also had fire.

You look younger than us, what kind of garlic is in here?

Xu Xin did not pay attention to the changes in the emotions of several people around him, looked at the layout of the engineering layout of the drill hole, and decided to follow the exploration line of the drill hole and move forward in a straight line.

As a result, they had to abandon the flat concrete roads and have to take country roads and even through the woods and thorns.

Because of the resentment against Xu Xin, the two technicians did not lead the way.

Xu Xin walked ahead, and his face and hands were cut by branches and spikes.

After walking about three hundred meters, he suddenly stopped, because he had made a new discovery.

On the overgrown ground, the earth buried cylindrical stones.

These stones are not ordinary stones, the cylindrical surface is smooth, and it is clear that the core of the drill rig has been drilled out of the ground!

These discarded cores were originally buried in the soil.

However, the burial depth was not deep, and after the rain washed away, some cores were exposed from the ground.