Jia Zhengjin went down to recover the pickaxe as much as he could, sealed the huge cavern formed by the methane explosion with stones, and then retreated to the surface first.

Re-recruit 1,000 kobold miners, send the tools down again, and let them keep digging.

This time, however, they adjusted their course, turning the steps fifty or sixty meters to the right, and then turning again and continuing towards the vein.

After returning to the surface and waiting for about half an hour, a kobold finally came up and kept calling to inform him that he had dug through.

Jia Zhengjin immediately entered the mine and reached the deepest part in one go.

Sure enough, walking down the stairs to the end, there is an unusually rich layer of ore. And very lucky, in addition to the abundant iron ore, copper ore, gold ore, silver ore, it seems that there is another color of ore buried deep in it.

However, just by looking at the color, Jia Zhengjin couldn't tell the composition of this ore, so he could only wait until the kobold miners successfully dug it to know what it was.

"You don't care about the other mines, dig in that direction for me!" Jia Zhengjin ordered the kobold miner troops, "When you dig the innermost ore, bring it up and show me!"

When the kobold received the order, he immediately brandished the iron pickaxe in his hand and desperately mined into it.

Four or five hundred kobolds dug together, and the scene was quite lively, and the speed was quite fast. The remaining kobolds were responsible for transporting the mined ore and stones up and down to the two mines outside before the mine was wide enough.

Jia Zhengjin returned to the land and slept soundly until a kobold came to wake him up.

"Huh?" Taking the ore handed by the kobold, Jia Zhengjin took a closer look.

Tungsten ore is a rare ore with a very low content.

Jia Zhengjin was immediately full of energy, and the haze of the loss of hundreds of kobold miners caused by the explosion just now disappeared in an instant.

On his way to Tansandia, he obtained a light bulb and street lamp manufacturing blueprint from a man named St. Thomas, and he originally said that this modern item should not be needed for the time being. But I didn't expect to accidentally find a tungsten mine!

The tungsten filament required for the production of light bulbs is smelted by tungsten ore.

Although the output of this tungsten ore is not high, the scale of the city now, it should be enough to fill the street lamps!

After dark, it was pitch black, and it was by far the biggest trouble. If you have street lights, you can brighten up at night!

Of course, electric lights need to be electric.

However, Jia Zhengjin is not worried about this, because he has the manufacturing drawings of the magic core battery! Only one electric magic core, two coal mines and two copper mines can be successfully manufactured!

Of course, he didn't understand how strong the power of the magic core battery was. But since it's made of magic cores, it's impossible to only drive some small toys like the small batteries in the previous life, right?

"Dig out all the tungsten ore for me!" Jia Zhengjin immediately ordered, "Don't move the silver ore until you leave it alone." When the tungsten ore is finished, then give me iron ore, copper ore and gold ore at the same time!"

The kobold received the order and immediately entered the mine to convey it.

There were really very few tungsten ores, and hundreds of kobolds sped up and dug them all out in just an hour.

After all, this kind of mine only accounts for about one thousandth of the stock in the entire underground mine.

There are also more than 400 tungsten ores, all of which are packed into Jia Zhengjin's virtual backpack.

Keep all the kobold miners, drop all the raw meat in their backpacks in their nests and mines, and let them mine on their own. Jia Zhengjin only needs to collect the mine once in a while and put in the food!

Riding back to the city on an imposter dragon, head to the warehouse and store the dirt and rocks that almost fill your backpack in wooden crates.

When he came out, he remembered that there seemed to be a second-order demonic beast in the beast pen.

So I stopped by and took a look, the fire-type demonic beast named Proboscis Bear had already been tamed!

Jia Zhengjin takes the proboscis bear out of the pen and asks Wolf to call the werewolf Vera.

Give the proboscis bear to Vera, so that the three werewolves have a powerful second-order demonic beast.

Two Dakras, a proboscis bear, and three werewolves who are all good in their own strength, can then take them out to hunt some first- to second-order electric demonic beasts and hunt the magic core in their bodies!

If you encounter other types of Warcraft, you can also catch them and bring them back to continue domesticating and expand the Warcraft army!

Vera got the second-order Demonic Beast Proboscis Bear, which seemed a little surprised. However, she did not have any doubts about Jia Zhengjin's decision.

"Early tomorrow morning, the three of you will bring your respective demonic beasts and go out hunting with me!" Jia Zhengjin said to them, "I need more demonic beasts and electric magic cores!"

"Yes!!" the three werewolves immediately responded.

Letting the werewolves continue to patrol, Jia Zhengjin rushed to the factory and put the 400 tungsten ore in his backpack into the furnace.

The smelting speed of tungsten ore is very slow, and only 4 tungsten alloys can be smelted out of 400 tungsten ore, which is pitiful!

However, now Jia Zhengjin does not want to make alloys, so he uses 1 tungsten ore to smelt into 1 tungsten wire, which is enough to make 400 tungsten wires!

The formula of the bulb is 1 tungsten filament, 2 glass. In other words, it's all smelted here, enough to make 400 light bulbs, and there is no difficulty in lighting up the whole city!

The glass is made of sand, which is very simple and can be made directly from stones.

1 stone is equal to 10 sand, and 5 sand is equal to one glass.

So when smelting tungsten ore, Jia Zhengjin simultaneously grinded sand on the tool table, and then made it into glass.

Light bulbs do not require many materials and are relatively easy to make.

However, the material requirements of street lamps are more troublesome!

A street lamp requires 1 bulb, 5 iron ingots, and 50 cement blocks.

Iron ingots are quite a troublesome part, after all, there are too many places that are needed, and the consumption is staggering. And 400 street lamps require at least 2,000 iron ingots, which is terrifying!

Fortunately, an underground mine has just been developed, and together with the open pit veins around the city, it should be able to provide it. The probability of ore coming out of the main underground veins is large, and the amount is relatively large.

As for cement blocks, the manufacturing method is very simple, and the material requirements are not high.

It is ordinary stones and clay, which are made into pebbles on a tool table, and then put into a furnace to smelt them into lime, and then add sand and clay to make cement. Finally, cement is synthesized into cement blocks!

It doesn't seem like a hassle to see the steps, but it's actually very easy to make.

Therefore, the next most important thing is the problem of electricity, as long as there is enough electricity, you can light up the street lights!

Gradually, there is a taste of modernization! Jia Zhengjin is full of energy.