Bow and thank "Heaven is not the end of the season" and "Twilight Breeze" for their 588 tips! "Super Battle Tyrannosaurus" and "Nature Hehe" each received a generous tip of 100 each, and "Violet Violet" gave a generous reward!

The open pit mine is an important aspect of cost savings, and another important aspect is the grade of the vein.

In the mineral resources industry, there is a well-known law that "the higher the grade vein, the lower the cost of extraction!" ”

This is a consensus reached by those who have been mining mineral resources for hundreds of years. On this earth, pure "heavenly mines" are extremely rare, just like the natural silver and natural gold that Tang Feng used cheating methods to get last time, which is the so-called "heavenly mines". This kind of ore does not need to be coarsely refined, only needs to be purified, and the cost of mining is naturally very low. But this mine basically exists only in legends.

After all, on this earth, many mineral resources exist in the form of chemical compounds, which are called ores. Therefore, modern mines dig ore directly, ores containing various mineral elements.

Take silver ore as an example, generally speaking, the mining boundary grade of silver ore is 40 grams ~ 50 grams / ton, and the normal industrial mining grade is 80 grams ~ 120 grams / ton, just calculate it according to the grade of 100 grams / ton, if you want to get a ton of pure silver, you must mine at least 10,000 tons of silver ore to extract a ton of pure silver from these ores.

And if you have a vein grade of 200 g/t, then you only need to mine 5,000 tonnes of silver ore to get one tonne of sterling silver. The gap between the two is the gap between the cost of extraction.

The higher the grade, the lower your mining costs!

Tang Feng has a star core in his hand, if he is not afraid of attracting the suspicion and attention of others, Tang Feng really wants to directly condense this mineral vein into a "heavenly mine", and what is dug out is not silver ore, but natural silver in different forms!

Of course Tang Feng would not be so brain-dead, more than a month ago he just made a batch of natural silver and natural gold that shocked the industry, if he made such a natural silver and silver vein with more huge reserves, it is estimated that the relevant departments will have to invite Tang Feng in for tea, and then slice and study.

This kind of thing must not happen, for the sake of safety, we still honestly make an ordinary silver ore vein, the big deal can be made a little higher, so that it will not arouse the suspicion of others.

Tang has produced high grades for this symbiotic vein, with an average grade of 860 g/t silver and 80 g/t gold and platinum group metals. Although this grade is very high, it is not outrageously high.

It is important to know that although the average industrial mining grade of silver ore is only 80 grams ~ 120 grams / ton, and the gold ore grade with mining value is only 0.3 grams ~ 0.5 grams / ton, there are still several silver mines in the world with a grade of more than kilograms / ton, and there are also gold mines with a grade of more than 200 grams / ton.

None of these rich ores aroused people's suspicion, and they only created a slightly higher-grade vein, and people would not doubt it nine times out of ten.

Now this symbiotic vein has finally been condensed and formed under Tang Feng's continuous efforts for half a month, so the next job is to find the leader, and then use the leader's mouth to make this world-class silver mine public.

These cover-ups must be done, and the reputation of the Explorer Company is also very loud in the industry, and the announcement of this news by the Leader can not only greatly increase the reputation of the Explorer Company, but also cover up what Tang Feng has done.

"Hey, Sam, put the work at hand for a while, I have good news here." Tang Feng, who had been wandering around the ranch for half a month, found Sam in a prefabricated house on this day, and said in an excited tone.

Seeing that Tang Feng's mood was very good, Sam couldn't help but smile and quipped, "What? You've been surveying alone for half a month, didn't you find the mine? ”

Tang Feng laughed, patted Sam on the shoulder and said, "Isn't this guy the roundworm in my stomach?" How do you guess the good news I want to tell you all at once? ”

"Oh,, don't compare me to that disgusting thing. But man, did you really find the baby? ”

Tang Feng shook his head and said: "Of course I haven't found the specific ore vein, and I don't have those professional survey tools, besides, do you think I can find a ore vein alone?" I mean, after half a month of surveying, I am 90% sure that there is a vein of precious metals under this land! ”

"Veins of precious metals? Can you be sure? Sam asked with some doubts, but Sam was not puzzled, although this ranch is also in the MacArthur Fault Basin, but more minerals here are those lead and zinc, those base metals, or there are seven world-class deposits in a huge area, and only one precious metal vein is the Cannington silver mine. Therefore, in Sam's opinion, even if precious metal veins can be found here, their scale and reserves should not be very large. On the contrary, the veins with large reserves should belong to the lead-zinc ore.

After all, in the hilly terrain of less than 20 kilometers north of the Lechhat River, there is a lead-zinc-uranium mine in progress, and the reserves of that mine are said to be not small.

That is to say, in the north and south ends of the MacArthur fault basin, rich reserves of lead-zinc ore have been discovered, so the pasture sandwiched in the middle, it is estimated that the largest reserves are still lead-zinc ore.

Seeing that Sam didn't seem to believe it, Tang Feng didn't think it was wrong, if there was no star core, then according to normal people's thinking, they would think that the most buried under this land should be lead-zinc ore.

Tang Feng smiled, handed the information in his hand to Sam, and said: "This is the data that I have detected in various locations of this land in the past half a month, look at the change curve of this precious metal element, it increases with the change of position, and it is not evenly distributed, that is to say, for example, the closer we are to our location, the higher its precious metal content, and vice versa." What does this mean? This means that right under our feet, there is a very rich deposit of precious metals waiting to be excavated! ”

Sam has been working with Explorer for more than four years, so he can naturally understand these data, so the more he looks, the more surprised Sam's face becomes, because even Sam, a half-baked resource surveyor, can see something from this data!

Tang Feng is naturally very sure of this data, because these data are directly taken out of the holographic analysis map, and the accuracy rate is absolutely not said!

After reading the data, Sam said with a look of surprise: "Then we can conduct a specific survey next?" Do you want me to send an invitation to the boss and let him come over? ”

Tang Feng laughed: "This is a must!" ”