So Yang Jing guessed 1 gram/ton, which he thought was not a low guess. After all, the Porgera gold mine is a silver-gold co-existing mine. In addition to more than 400 tons of gold reserves, it also has more than 1,000 tons of silver reserves.

Liu Zhaoming smiled and shook his head, saying, "Director Yang, your guess is a bit low."

"Ah? This is still low?" Yang Jing couldn't believe it.

"Yes, your number is really a bit low. Here are some numbers for you to listen to. The Porgera gold mine was built and put into production in 1990, and it has been in production for 28 years. From the start of production in 1990 to 2015, the gold mine produced a total of 19.36 million ounces of gold, which is about 602 tons of gold. Now the gold mine is still said to have 400 tons of gold reserves, which is the remaining gold resource reserves of the gold mine. The gold mine has been in production for 28 years, and the average grade of gold ore in the entire gold mine is as high as 44 grams per ton."

This number made Yang Jing and Guo Xiang gasp. Guo Xiang asked in disbelief, "Teacher Liu, is the average grade of this gold mine really this high?"

Liu Zhaoming nodded and pushed up his glasses. "When I came to investigate two years ago, I was shocked to learn that the highest gold ore grade of this gold mine was over 726 grams per ton. But I have to admit that both the Porgera gold mine and the Grasberg copper-gold mine to the west of this gold mine are huge treasures bestowed upon this island by the master."

After a pause, Liu Zhaoming continued, "In fact, the average grade of gold ore in the two largest gold mines in Papua New Guinea is very high. Even the Lihir Island Copper-Gold Mine on Lihir Island has an average grade of 2,732 grams per ton. In other words, if we can find another gold mine or a copper-gold mine or other associated mineral, the gold ore grade there will definitely not be much lower."

Liu Zhaoming's words reminded Yang Jing of the fleeting green light he saw from the mountain range when he was about to arrive at Porgera. Although he only took a glance and did not observe carefully, he felt that the green light that appeared in the mountain range did not seem to be much worse than the green light revealed by the Porgera gold mine.

Is there a gold mine in that place with a similar situation to the Porgera gold mine?

Thinking of this, Yang Jing asked Liu Zhaoming: "Teacher Liu, if you can find another gold mine in the Mahler Mountains, will the grade be equally high?"

Liu Zhaoming paused for a moment and said, "I'm not completely sure about this, but based on the reasons why the Porgera gold mine was formed, I am 70% sure that if another gold mine can be discovered in the Male Mountains, its grade should be similar to that of the Porgera gold mine."

Liu Zhaoming pushed his glasses and pointed to the surrounding mountains and said: "The Porgera gold mine is located in the New Guinea orogenic belt. The orogenic belt is located on the northeastern edge of the Australian plate. It is the boundary between the Indo-Australian plate and the Pacific plate and a series of other plates such as the Caroline plate and the Philippine plate. The orogenic belt began to form after the Triassic-Jurassic period, and experienced a series of arc-continent collision processes in the Mesozoic and Cenozoic eras, forming the current form of the orogenic belt. In other words, Porgera is a typical shallow low-temperature hydrothermal deposit. In this area, once gold mines are discovered again, they will almost be low-temperature hydrothermal deposits like the Porgera gold mine."

Liu Zhaoming babble a lot of professional terms. Although Yang Jing didn't understand much, looking at Liu Zhaoming's confident expression, Yang Jing knew that what he said was true.

Liu Zhaoming was a real mining expert that Guo Dabao had invited from Hua Xia University of Mining and Technology with great effort. Since he dared to say so, he must be confident enough to prove that what he said was not groundless.

In that case, after visiting this gold mine, I will go back and take a look at the area that I just discovered that was emitting green light!

If a gold mine of the same level as the Porgera gold mine is discovered, Rongbao Mining will be able to enter another precious metal mine with huge profits!

ps: I bow to thank “震世界” for the reward of 500.