Firewood was brought and a flame was lit in a room in the slave courtyard.

Han Cheng picked up the two smallest pieces of rubble from a few pieces of rubble and threw them into the fire.

Under the gaze of everyone, it didn't take much effort, and the two green stones began to change color and become black.

After burning for a while, Han Cheng used a branch to start pulling the two small blackened stones out.

The stones burned by the flames became very fragile, and in the process of pulling, one of them had already cracked.

Han Cheng pressed the stick in his hand against the stone that had been pulled out, pressed it down, and it didn't take much effort to break it.

After waiting for a while, after the broken stone was cold, Han Cheng squatted down, pinched up a small piece of blackened stone, and twisted it with his fingers, and it turned into a crumb.

Looking at the fine soil-like scraps in his hand, the smile on Han Cheng's face finally began to be uncontrollable.

This green stone is malachite, and where there is malachite, there must be an open-pit copper mine nearby.

Because malachite is formed by long-term oxidation of open-pit copper ore and seeping to the outside.

Malachite has always been an important basis for people to find copper ore.

This black fine powder is the oxidized copper, and if it is reduced at high temperature with charcoal, copper can be obtained.

But he didn't, because there was so little malachite.

Han Cheng's actions touched the hearts of everyone around him, and when he smiled, everyone around him who was watching also breathed a sigh of relief and became excited.

"From this stone you can refine a metal that is not as hard and sharp as iron, but just as good as it is."

Han Sung announced the good news to the people around him.

Copper is soft, not suitable for sharp tools, but it is still very good for blunt tools, after all, it is easier to shape, and it also has a toughness that stone does not have.

However, if tin ore and lead ore can be found, and copper-tin or copper-tin alloys can be smelted, the situation can be greatly improved.

Because copper-lead or copper-tin alloy is bronze.

Bronze is hard and can be used to forge sharp weapons and farm tools.

The famous swords in history, such as Ganjiang and Mo Ye, are all bronze swords.

Of course, the chopping is not as good as the well-made steel knives of later generations, but it also directly proves the feasibility of making such tools from bronze when steel has not been greatly developed.

Tin ore is relatively easy to solve, because tin ore is generally easy to be associated with copper ore.

Speaking of which, it makes perfect sense that bronze and then steel appeared first in the history of civilization, because the melting point of the metal ore required for bronze is much lower than that of steel.

After Han Cheng announced the news, Wu and the others smiled.

The existence of iron knives and axes made them deeply realize the usefulness of metal tools, and now how could they not be happy to hear Miko announce that they could make another metal out of this beautiful green stone to make tools?

As for what Han Cheng said was not as good as iron, it was directly ignored by them, as far as they were concerned, as long as it was metal.

"Where did you get this stone?"

Han Cheng asked the long legs standing not far away.

Long Legs still looked a little stunned, no matter what, he didn't expect that the stone that he used as a talisman could actually refine metal.

Metal, he had seen, and the somewhat blackened axe carried by the lame carpenter of the tribe was made of metal.

Even though he had seen the lame creature chopping down trees with a black axe several times, Longleg was still amazed at how fast it was.

Now that he learned that the amulet he had worn for a long time could refine a metal, how could he not be stunned?

"In... Tribal ......"

Long-legged in broken Mandarin slowly tells the origin of malachite.

Han Cheng also slowly figured it out.

On a hill near the Teng Snake tribe, where the vegetation grew sparsely, there were some beautiful blue puddles, where Long Legs picked up a beautiful piece of malachite of the right size, polished it, tied it with a rope and hung it around his neck as an amulet.

In the long-legged story, Han Cheng also heard another thing.

That is, there were once people in the Teng Snake tribe who drank those beautiful waters, and then their stomachs hurt and they died.

Since then, they have learned that the beautiful water in those pits is not drinkable.

This is the characteristic of primitive times, and a lot of knowledge is acquired with the death of man.

Han Cheng asked the man why he drank the water from the stone pit, and the reply was that the water there was as blue as the sky, and some people thought that after drinking it, he could get the blessing of the gods.

Han Cheng couldn't help but sniffle, sure enough, he was an ignorant and fearless.

By the time the rain had stopped for almost a day, it was already dark.

The rain stopped, but because it was already night and the sun had not risen, the air was still very cold, and it was most comfortable to sleep at night.

Han Cheng didn't feel much sleepy at this time, on the one hand, he slept a lot during the day, and on the other hand, he was thinking about the surprise news he got today.

There is nowhere to find the iron shoes, and it takes no effort to get them. It is a true portrayal of the news of the copper mine this time.

It is really surprising and surprising that the fruitless copper ore is actually right under the nose.

Han Cheng didn't care too much about the size of the copper mine there, because according to the current situation of the Qingque tribe, even the smallest copper mine was enough to use

I have to go to the lair of the Tengsnake tribe to see what is going on in the copper mine, and walk around to see if I can find traces of tin ore.

After thinking about copper mines and copper-related things for a while, Han Cheng made such a decision in his heart.

After all, he is a latecomer in the tribe who is more familiar with these things, and he must go to this matter.

And he has to leave as soon as possible, on the one hand, he wants to confirm these things as soon as possible, and on the other hand, it won't be long before Bai Xuemei will give birth.

He had to do a good job of this in the period before Bai Xuemei gave birth, and then return to the tribe from there.

No matter what kind of customs this era is, when Bai Xuemei gives birth, Han Chengdu has to return to the tribe to stay by Bai Xuemei's side.

Because this is the most vulnerable moment for women, it is easy to be dangerous, although Bai Xuemei is not as flexible as she is now, and she does not have the slightest consciousness of a pregnant woman.

Another important reason is that he wants to welcome the birth of his child.

It was his first child in the flesh and blood, the afterlife and the present combined, and he didn't want to miss this important time.